193 results on '"A. Comerón"'
Search Results
2. On the temperature stability requirements of free-running Nd:YAG lasers for atmospheric temperature profiling through the rotational Raman technique.
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Zenteno-Hernández, José Alex, Comerón, Adolfo, Dios, Federico, Rodríguez-Gómez, Alejandro, Muñoz-Porcar, Constantino, Sicard, Michaël, Franco, Noemi, Behrendt, Andreas, and Di Girolamo, Paolo
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ATMOSPHERIC temperature measurements , *ND-YAG lasers , *ATMOSPHERIC temperature , *TEMPERATURE measurements , *LIDAR - Abstract
We assess the temperature stability requirements of unseeded Nd:YAG lasers in lidar systems for atmospheric temperature profiling through the rotational Raman technique. Taking as a reference a system using a seeded laser assumed to emit pulses of negligible spectral width and free of wavelength drifts, we estimate first the effect of the pulse spectral widening of the unseeded laser on the output of the interference filters, and then we derive the limits of the allowable wavelength drift for a given bias in the temperature measurement that would add to the noise-induced uncertainty. Finally, using spectroscopic data, we relate the allowable wavelength drift to allowable temperature variations in the YAG rod. We find that, in order to keep the bias affecting atmospheric temperature measurements smaller than 1 K, the Nd:YAG rod temperature should also be kept within a variation range of 1 K. [ABSTRACT FROM AUTHOR]
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- 2024
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3. Cirrus scenes in Barcelona, Spain: Geometrical and optical properties and radiative effects.
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Díaz, Cristina Gil, Sicard, Michäel, Sourdeval, Odran, Comerón, Adolfo, Muñoz-Porcar, Constantino, and Rodríguez-Gómez, Alejandro
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OPTICAL properties ,CIRRUS clouds ,ATMOSPHERIC models ,LIDAR ,RADIOSONDES - Abstract
For the first time, geometrical, optical and radiative properties of cirrus clouds, measured with a Polarized Micro Pulse Lidar (P-MPL) in Barcelona, have been analysed. For this purpose, the identification of cirrus scenes and the application of the two-way transmittance method have been applied to P-MPL products, published in the website of Micro Pulse Lidar NETwork (MPLNET), along with radiosondes from 2019-2021. The radiative properties of cirrus scenes have been determined through the use of an ensemble scattering model for cirrus clouds and their radiative effects have been calculated with GAME (Global Atmospheric ModEl) model. The results show that the highest occurrence of cirrus is in spring, the cirrus being in 81% of the cases either visible or opaque. Most cirrus have a COD between 0.1-0.2 (49%), LR around 30 sr (53%), linear cloud depolarization ratio between 0.3-0.5 (50%) and IWC lower than 0.01g/m3 (80%). Also, the net radiative effects of 4 selected cirrus case studies were found to be positive at both daytime and nighttime. [ABSTRACT FROM AUTHOR]
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- 2024
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- View/download PDF
4. Geometrical and optical properties of cirrus clouds in Barcelona, Spain: analysis with the two-way transmittance method of 4 years of lidar measurements.
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Gil-Díaz, Cristina, Sicard, Michäel, Comerón, Adolfo, dos Santos Oliveira, Daniel Camilo Fortunato, Muñoz-Porcar, Constantino, Rodríguez-Gómez, Alejandro, Lewis, Jasper R., Welton, Ellsworth J., and Lolli, Simone
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CIRRUS clouds ,LIDAR ,SPACE-based radar ,OPTICAL properties ,LITERATURE reviews ,STATISTICAL errors ,LASER based sensors - Abstract
In this paper a statistical study of cirrus geometrical and optical properties based on 4 years of continuous ground-based lidar measurements with the Barcelona (Spain) Micro Pulse Lidar (MPL) is analysed. First, a review of the literature on the two-way transmittance method is presented. This method is a well-known lidar inversion method used to retrieve the optical properties of an aerosol–cloud layer between two molecular (i.e. aerosol and cloud-free) regions below and above, without the need to make any a priori assumptions about their optical and/or microphysical properties. Second, a simple mathematical expression of the two-way transmittance method is proposed for both ground-based and spaceborne lidar systems. This approach of the method allows the retrieval of the cloud optical depth, the cloud column lidar ratio and the vertical profile of the cloud backscatter coefficient. The method is illustrated for a cirrus cloud using measurements from the ground-based MPL and from the spaceborne Cloud-Aerosol Lidar with Orthogonal Polarization (CALIOP). Third, the database is then filtered with a cirrus identification criterion based on (and compared to) the literature using only lidar and radiosonde data. During the period from November 2018 to September 2022, 367 high-altitude cirrus clouds were identified at 00:00 and 12:00 UTC, of which 203 were successfully inverted with the two-way transmittance method. The statistical results of these 203 high-altitude cirrus clouds show that the cloud thickness is 1.8 ± 1.1 km, the mid-cloud temperature is - 51 ± 8 ∘ C and the linear cloud depolarization ratio is 0.32 ± 0.13. The application of the transmittance method yields an average cloud optical depth (COD) of 0.36 ± 0.45 and a mean effective column lidar ratio of 30 ± 19 sr. Statistical results of the errors associated with the two-way transmittance method retrievals are also provided. The highest occurrence of cirrus is observed in spring and the majority of cirrus clouds (48 %) are visible (0.03 < COD < 0.3), followed by opaque (COD > 0.3) with a percentage of 38 %. Together with results from other sites, possible latitudinal dependencies have been analysed together with correlations between cirrus cloud properties. For example, we noted that in Barcelona the COD correlates positively with the cloud base temperature, effective column lidar ratio and linear cloud depolarization ratio and negatively with the cloud base height. [ABSTRACT FROM AUTHOR]
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- 2024
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5. Evaluation of the Accuracy of the Aerosol Optical and Microphysical Retrievals by the GRASP Algorithm from Combined Measurements of a Polarized Sun-Sky-Lunar Photometer and a Three-Wavelength Elastic Lidar.
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dos Santos Oliveira, Daniel Camilo Fortunato, Sicard, Michaël, Rodríguez-Gómez, Alejandro, Comerón, Adolfo, Muñoz-Porcar, Constantino, Gil-Díaz, Cristina, Lolli, Simone, Dubovik, Oleg, Lopatin, Anton, Herrera, Milagros Estefanía, and Herreras-Giralda, Marcos
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ALBEDO ,LIDAR ,AEROSOLS ,DOPPLER lidar ,STANDARD deviations ,PHOTOMETERS ,LINEAR polarization - Abstract
The versatile Generalized Retrieval of Aerosol and Surface Properties (GRASP) algorithm exploits the advantages of synergic ground-based aerosol observations such as radiometric (sensitive to columnar aerosol optical and microphysical properties) and lidar (sensitive to vertical distribution of the optical properties) observations. The synergy is possible when the complementary data is mutually constrained by GRASP parametrization that includes, for the first time ever, the degree of linear polarization (DoLP) parameter measured by a polarized sun-sky-lunar AERONET photometer (380, 440, 500, 675, 870, 1020, and 1640 nm) in synergy with the vertical profiles from an elastic lidar (355, 532, and 1064 nm). First, a series of numerical tests is performed using simulated data generated using a climatology of data and ground-based measurements. The inversions are performed with and without random noise for five different combinations of input data, starting from the AERONET-like dataset and increasing to the complex one by adding more information for three aerosol scenarios: I—high aerosol optical depth (AOD) with dominant coarse mode; II—low AOD with dominant coarse mode; III—high AOD with dominant fine mode. The inclusion of DoLP improves (i) the retrieval accuracy of the fine-mode properties when it is not dominant; (ii) the retrieval accuracy of the coarse-mode properties at longer wavelengths and that of the fine-mode properties at shorter wavelengths; (iii) the retrieval accuracy of the coarse-mode real part of the refractive index (up to 36% reduction), but has no effect on the retrieval of the imaginary part; (iv) reduces up to 83% the bias of the sphere fraction (SF) retrieval in coarse-mode dominated regimes; and (v) the root mean square error (RMSE) of the retrieval for most of the parameters in all scenarios. In addition, the addition of more photometer channels in synergy with a three-wavelength elastic lidar reduces the RMSE for the real part (67% in the coarse mode) and the imaginary part (35% in the fine mode) of the refractive index, the single scattering albedo (38% in the fine mode), the lidar ratio (20% in the coarse mode), and the SF (43%). [ABSTRACT FROM AUTHOR]
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- 2023
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6. Characterization of Tajogaite volcanic plumes detected over the Iberian Peninsula from a set of satellite and ground-based remote sensing instrumentation
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Salgueiro, Vanda, Guerrero Rascado, Juan Luis, Costa, Maria João, Román, Roberto, Cazorla, Alberto, Serrano, Antonio, Molero, Francisco, Sicard, Michaël, Cordoba Jabonero, Carmen, Bortoli, D., Comerón Tejero, Adolfo, Couto, Flavio Tiago, López Cayuela, María Ángeles, Pérez Ramírez, Daniel, Potes, Miguel, Muñiz Rosado, Jorge Andrés, Obregón, M.A., Barragán, Rubén, Abril Gago, Jesús, González Catón, Ramiro, Gil Díaz, Cristina, Foyo Moreno, I., Muñoz Porcar, Constantino, Granados Muñoz, María José, Rodríguez Gómez, Alejandro Antonio, Herreras Giralda, A., Bravo Aranda, Juan Antonio, Carvajal Pérez, Clara Violeta, Barreto Velasco, África, Alados Arboledas, Lucas, Universitat Politècnica de Catalunya. Departament de Teoria del Senyal i Comunicacions, Universitat Politècnica de Catalunya. Doctorat en Teoria del Senyal i Comunicacions, Universitat Politècnica de Catalunya. Doctorat en Ciència i Tecnologia Aeroespacials, and Universitat Politècnica de Catalunya. CommSensLab-UPC - Centre Específic de Recerca en Comunicació i Detecció UPC
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GRASP algorithm ,Lidar ,Ceilometer ,Sun-photometer ,Satellite remote sensing ,Volcanoes ,Volcans ,Sulphur dioxide ,Enginyeria de la telecomunicació [Àrees temàtiques de la UPC] ,Volcanic sulphates - Abstract
Three volcanic plumes were detected during the Tajogaite volcano eruptive activity (Canary Islands, Spain, September–December 2021) over the Iberian Peninsula. The spatiotemporal evolution of these events is characterised by combining passive satellite remote sensing and ground-based lidar and sun-photometer systems. The inversion algorithm GRASP is used with a suite of ground-based remote sensing instruments such as lidar/ceilometer and sun-photometer from eight sites at different locations throughout the Iberian Peninsula. Satellite observations showed that the volcanic ash plumes remained nearby the Canary Islands covering a mean area of 120 ± 202 km2 during the whole period of eruptive activity and that sulphur dioxide plumes reached the Iberian Peninsula. Remote sensing observations showed that the three events were mainly composed of sulphates, which were transported from the volcano into the free troposphere. The high backscatter-related Ångström exponents for wavelengths 532–1064 nm (1.17 ± 0.20 to 1.40 ± 0.24) and low particle depolarization ratios (0.08 ± 0.02 to 0.09 ± 0.02), measured by the multi-wavelength Raman lidar, hinted at the presence of spherical small particles. The layer aerosol optical depth at 532 nm (AODL532) obtained from lidar measurements contributed between 49% and 82% to the AERONET total column AOD at 532 nm in event II (11–13 October). According to the GRASP retrievals, the layer aerosol optical depth at 440 nm (AODL440) was higher in all sites during event II with values between 0.097 (Badajoz) and 0.233 (Guadiana-UGR) and lower in event III (19–21 October) varying between 0.003 (Granada) and 0.026 (Évora). Compared with the GRASP retrievals of total column AOD at 440 nm, the AODL440 had contributions between 21% and 52% during event II. In the event I (25–28 September), the mean volume concentrations (VC) varied between 5 ± 4 µm3cm-3 (El-Arenosillo/Huelva) and 17 ± 10 µm3cm-3 (Guadiana-UGR), while in event II this variation was from 11 ± 7 µm3cm-3 (Badajoz) to 27 ± 10 µm3cm-3 (Guadiana-UGR). Due to the impact of volcanic events on atmospheric and economic fields, such as radiative forcing and airspace security, a proper characterization is required. This work undertakes it using advanced instrumentation and methods. Évora team funded by national funds through FCT - Fundação para a Ciência e Tecnologia, I.P., in the framework of the ICT project with the references UIDB/04683/2020 and UIDP/04683/2020 and by TOMAQAPA (PTDC/CTAMET/29678/2017). The authors acknowledge the GRASP-ACE (Grant agreement ID: 778349), ACTRIS-IMP (Grant agreement ID:871115), ATMO-ACCESS (Grant Agreement ID: 101008004), PROBE (COST Action number: CA18235), HARMONIA (COST Action number: CA21119), EUMETNET through the E-PROFILE program and REALISTIC (Grant agreement ID:101086690) projects. The authors acknowledge the support through ACTRIS-2 under grant agreement no.654109. This work was partially supported by the Spanish national projects PID2019-103886RB-I00/AEI/10.13039/501100011033, INTEGRATYON3 (PID2020-117825GB-C21 and PID2020-117825GB-C22), ELPIS (PID2020-120015RB-I00), CLARIN (CGL2016-81092-R), ePOLAAR (RTI2018-097864-B-I00), CAMELIA (PID2019-104205GB-C21/AEI/10.13039/501100011033) and ACTRIS-España (CGL2017-90884REDT), by University of Granada Plan Propio through Singular Laboratory (LS2022-1) program, by the Andalusia Autonomous Government projects AEROPRE (P18-RT-3820) and ADAPNE (P20_00136), by the UGR-FEDER projects DEM3TRIOS (A-RNM-430-UGR20) and MOGATRACO (A-RNM-524-UGR20) and partially by the Scientific Units of Excellence Program (grant no. UCE-PP2017-02), and by the R+D+i grant RTI 2018-097332-B-C22 funded by MCIN/AEI/ 10.13039/501100011033/ and “ERDF A Way of Doing Europe”. M.-Á. López-Cayuela and C.V. Carvajal-Pérez are supported by the INTA predoctoral contract program.
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- 2023
7. Geometrical and optical properties of cirrus clouds in Barcelona, Spain: Analysis with the two-way transmittance method of 5 years of lidar measurements.
- Author
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Gil-Díaz, Cristina, Sicard, Michäel, Comerón, Adolfo, Fortunato dos Santos Oliveira, Daniel Camilo, Muñoz-Porcar, Constantino, Rodríguez-Gómez, Alejandro, Lewis, Jasper R., Judd Welton, Ellsworth, and Lolli, Simone
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CIRRUS clouds ,WATER vapor ,ICE clouds ,LIDAR ,OPTICAL properties ,LITERATURE reviews ,ICE crystals - Abstract
In this paper a statistical study of cirrus geometrical and optical properties based on 5 years of continuous ground-based lidar measurements with the Barcelona (Spain) Micro Pulse Lidar (MPL) is analysed. First, a review of the literature on the two-way transmittance method is presented. This method is a well-known lidar inversion method used to retrieve the optical properties of an aerosol/cloud layer between two molecular (i.e. aerosol/cloud-free) regions below and above, without the need to make any a priori assumptions about their optical and/or microphysical properties. Second, a simple mathematical expression of the two-way transmittance method is proposed for both ground-based and spaceborne lidar systems. This approach of the method allows the retrieval of the cloud optical depth, the columnar cloud lidar ratio and the vertical profile of the cloud backscatter coefficient. The method is illustrated for a cirrus cloud using measurements from a ground-based MPL and from the spaceborne Cloud-Aerosol Lidar with Orthogonal Polarization (CALIOP). Third, the data base is then filtered with a cirrus identification criterion based on (and compared to) the literature using only lidar and radiosonde data. During the period from November 2018 to September 2022, 367 high-altitude cirrus clouds have been identified at 00 and 12 UTC, of which 203 were successfully inverted with the two-way transmittance method. The statistical results of these 203 high-altitude cirrus clouds show that the cloud thickness is 1.8 ± 1.1 km, the mid-cloud temperature is -51 ± 8 °C and linear cloud depolarization ratio is 0.32 ± 0.13. The application of the transmittance method yields an average cloud optical depth (COD) of 0.36 ± 0.45 and a mean lidar ratio of 30 ± 19 sr. It is observed that the highest occurrence of cirrus is in spring and the majority of cirrus clouds (48 %) are visible (0.03 < COD < 0.3), followed by opaque (COD > 0.3) with a percentage of 38 %. Together with results from other sites, a possible latitudinal dependence of lidar ratio is detected: the lidar ratio increases with increasing latitude. We also note that in Barcelona the COD correlates positively with the cloud base temperature, lidar ratio and linear cloud depolarization ratio and negatively with the cloud base height. On the one hand, the decrease of the cloud base temperature and COD associated to an increase of the cloud base height occurs because clouds located at higher altitudes are formed from air masses with a lower water vapour content and, therefore, their geometric and optical thickness are smaller. On the other hand, the lidar ratio increases with increasing cloud optical depth, as the complexity and diversity of ice crystal shapes increases, due to collisions and turbulence. Lastly, the linear cloud depolarization ratio has a slightly positive tendency with the cloud optical depth, because as the cloud optical depth increases, the number of ice crystals increases and, as a consequence, the randomly aggregation of ice crystals within the cloud occurs more frequently, making ice crystals rougher and thus more depolarizing. [ABSTRACT FROM AUTHOR]
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- 2023
- Full Text
- View/download PDF
8. Spatio-temporal monitoring by ground-based and air- and space-borne lidars of a moderate Saharan dust event affecting southern Europe in June 2013 in the framework of the ADRIMED/ChArMEx campaign
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Barragan, R., Sicard, M., Totems, J., Léon, J. F., Dulac, F., Mallet, M., Pelon, J., Alados-Arboledas, L., Amodeo, A., Augustin, P., Boselli, A., Bravo-Aranda, J. A., Burlizzi, P., Chazette, P., Comerón, A., D’Amico, G., Dubuisson, P., Granados-Muñoz, M. J., Leto, G., Guerrero-Rascado, J. L., Madonna, F., Mona, L., Muñoz-Porcar, C., Pappalardo, G., Perrone, M. R., Pont, V., Rocadenbosch, F., Rodriguez-Gomez, A., Scollo, S., Spinelli, N., Titos, G., Wang, X., and Sanchez, R. Zanmar
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- 2017
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9. Measurement report: Characterization of the vertical distribution of airborne Pinus pollen in the atmosphere with lidar-derived profiles – a modeling case study in the region of Barcelona, NE Spain
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M. Sicard, O. Jorba, J. J. Ho, R. Izquierdo, C. De Linares, M. Alarcón, A. Comerón, J. Belmonte, European Commission, Ministerio de Economía y Competitividad (España), Ministerio de Ciencia, Innovación y Universidades (España), Generalitat de Catalunya, Universitat Politècnica de Catalunya. Departament de Teoria del Senyal i Comunicacions, Universitat Politècnica de Catalunya. Departament de Física, Barcelona Supercomputing Center, and Universitat Politècnica de Catalunya. RSLAB - Grup de Recerca en Teledetecció
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Atmospheric Science ,010504 meteorology & atmospheric sciences ,Atmospheric transport ,Planetary boundary layer ,QC1-999 ,Optical radar ,Pollen -- Measurement ,Pinus pollen ,medicine.disease_cause ,Atmospheric sciences ,01 natural sciences ,Modelling ,Atmosphere ,010309 optics ,Pollen ,0103 physical sciences ,medicine ,Mass concentration (chemistry) ,QD1-999 ,0105 earth and related environmental sciences ,Lidar ,Physics ,Pol·len -- Mesurament ,Radar òptic ,Plume ,Chemistry ,Enginyeria de la telecomunicació::Telecomunicació òptica [Àrees temàtiques de la UPC] ,Boundary layer ,Deposition (aerosol physics) ,13. Climate action ,Environmental science ,Iberian Peninsula - Abstract
The authors thankfully acknowledge the computer resources at MareNostrum 4 and the technical support provided by BSC (grant nos. RES-AECT-2019-3-0001 and RES-AECT-2020-1-0007). The authors also thank the Meteorological Service of Catalonia for providing the meteorological measurements. The MPLNET staff at NASA GSFC are warmly acknowledged, for the continuous help in keeping Barcelona MPL system and the data analysis up to date. Jose Maria Baldasano is acknowledged as the principal investigator (PI) of the Barcelona MPL.v, This paper investigates the mechanisms involved in the dispersion, structure, and mixing in the vertical column of atmospheric pollen. The methodology used employs observations of pollen concentration obtained from Hirst samplers (we will refer to this as surface pollen) and vertical distribution (polarization-sensitive lidar), as well as nested numerical simulations with an atmospheric transport model and a simplified pollen module developed especially for this study. The study focuses on the predominant pollen type, Pinus, of the intense pollination event which occurred in the region of Barcelona, Catalonia, NE Spain, during 27– 31 March 2015. First, conversion formulas are expressed to convert lidar-derived total backscatter coefficient and modelderived mass concentration into pollen grains concentration, the magnitude measured at the surface by means of aerobiological methods, and, for the first time ever, a relationship between optical and mass properties of atmospheric pollen through the estimation of the so-called specific extinction cross section is quantified in ambient conditions. Second, the model horizontal representativeness is assessed through a comparison between nested pollen simulations at 9, 3, and 1 km horizontal resolution and observed meteorological and aerobiological variables at seven sites around Catalonia. Finally, hourly observations of surface and column concentration in Barcelona are analyzed with the different numerical simulations at increasing horizontal resolution and varying sedimentation/deposition parameters. We find that the 9 or 3 km simulations are less sensitive to the meteorology errors; hence, they should be preferred for specific forecasting applications. The largest discrepancies between measured surface (Hirst) and column (lidar) concentrations occur during nighttime, where only residual pollen is detected in the column, whereas it is also present at the surface. The main reason is related to the lidar characteristics which have the lowest useful range bin at 225 m, above the usually very thin nocturnal stable boundary layer. At the hour of the day of maximum insolation, the pollen layer does not extend up to the top of the planetary boundary layer, according to the observations (lidar), probably because of gravity effects; however, the model simulates the pollen plume up to the top of the planetary boundary layer, resulting in an overestimation of the pollen load. Besides the large size and weight of Pinus grains, sedimentation/deposition processes have only a limited impact on the model vertical concentration in contrast to the emission processes. For further modeling research, emphasis is put on the accurate knowledge of plant/tree spatial distribution, density, and type, as well as on the establishment of reliable phenology functions., BSC RES-AECT-2019-3-0001 RES-AECT-2020-1-0007
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- 2021
10. An explicit formulation for the retrieval of the overlap function in an elastic and Raman aerosol lidar.
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Comerón, Adolfo, Muñoz-Porcar, Constantino, Rodríguez-Gómez, Alejandro, Sicard, Michaël, Dios, Federico, Gil-Díaz, Cristina, dos Santos Oliveira, Daniel Camilo Fortunato, and Rocadenbosch, Francesc
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LIDAR , *AEROSOLS , *ERROR functions , *BACKSCATTERING , *CARBONACEOUS aerosols - Abstract
We derive an explicit (i.e., non-iterative) formula for the retrieval of the overlap function in an aerosol lidar with both elastic and Raman N 2 and/or O 2 channels used for independent measurements of aerosol backscatter and extinction coefficients. The formula requires only the measured, range-corrected elastic and the corresponding Raman signals, plus an assumed lidar ratio. We assess the influence of the lidar ratio error in the overlap function retrieval and present retrieval examples. [ABSTRACT FROM AUTHOR]
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- 2023
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11. A compact formulation for the retrieval of the overlap function in an elastic/Raman aerosol lidar.
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Comerón, Adolfo, Muñoz-Porcar, Constantino, Rodríguez-Gómez, Alejandro, Sicard, Michaël, Dios, Federico, Gil-Díaz, Cristina, Fortunato dos Santos Oliveira, Daniel Camilo, and Rocadenbosch, Francesc
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LIDAR , *AEROSOLS , *ERROR functions , *RAMEN , *BACKSCATTERING - Abstract
We derive an explicit (i.e. non-iterative) formula for the retrieval of the overlap function in an aerosol lidar with both elastic and Raman N2 or/and O2 channels used for independent measurements of aerosol backscatter and extinction coefficients. The formula requires only the measured, range-corrected, elastic and the corresponding Raman signals, plus an assumed lidar ratio. We assess the influence of the lidar ratio error in the overlap function retrieval and present retrieval examples. [ABSTRACT FROM AUTHOR]
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- 2023
- Full Text
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12. A network of water vapor Raman lidars for improving heavy precipitation forecasting in southern France: introducing the WaLiNeAs initiative
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Cyrille Flamant, Rohith Thundathil, Andreas Behrendt, Clotilde Augros, Pierre Brousseau, Pascal Genau, Olivier Caumont, Marco Cacciani, Alexandre Baron, Alejandro Rodríguez-Gómez, Véronique Ducrocq, Julien Totems, Benedetto De Rosa, Diego Lange, Constantino Muñoz-Porcar, Laurent Labatut, Volker Wulfmeyer, Adolfo Comerón, Patrick Chazette, Donato Summa, Nadia Fourrié, Paolo Di Girolamo, Michaël Sicard, Universitat Politècnica de Catalunya. Departament de Teoria del Senyal i Comunicacions, Universitat Politècnica de Catalunya. RSLAB - Grup de Recerca en Teledetecció, TROPO - LATMOS, Laboratoire Atmosphères, Milieux, Observations Spatiales (LATMOS), Sorbonne Université (SU)-Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Centre National de la Recherche Scientifique (CNRS)-Institut national des sciences de l'Univers (INSU - CNRS)-Sorbonne Université (SU)-Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Centre National de la Recherche Scientifique (CNRS)-Institut national des sciences de l'Univers (INSU - CNRS), Laboratoire des Sciences du Climat et de l'Environnement [Gif-sur-Yvette] (LSCE), Institut national des sciences de l'Univers (INSU - CNRS)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université de Versailles Saint-Quentin-en-Yvelines (UVSQ), Chimie Atmosphérique Expérimentale (CAE), Institut national des sciences de l'Univers (INSU - CNRS)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Institut national des sciences de l'Univers (INSU - CNRS)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université de Versailles Saint-Quentin-en-Yvelines (UVSQ), Centre national de recherches météorologiques (CNRM), Institut national des sciences de l'Univers (INSU - CNRS)-Météo France-Centre National de la Recherche Scientifique (CNRS), Scuola di Ingegneria [Potenza], Università degli studi della Basilicata [Potenza] (UNIBAS), Institut für Physik und Meteorologie [Stuttgart] (IPM), Universität Hohenheim, Department of Signal Theory and Communications [Barcelona] (TSC), Universitat Politècnica de Catalunya [Barcelona] (UPC), Institut d'Estudis Espacials de Catalunya (IEEC-CSIC), Sorbonne Université (SU)-Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Centre National de la Recherche Scientifique (CNRS)-Institut national des sciences de l'Univers (INSU - CNRS), Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Institut national des sciences de l'Univers (INSU - CNRS)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS)-Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Institut national des sciences de l'Univers (INSU - CNRS)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS), Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut national des sciences de l'Univers (INSU - CNRS)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS), Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut national des sciences de l'Univers (INSU - CNRS)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS)-Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut national des sciences de l'Univers (INSU - CNRS)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS), Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire Midi-Pyrénées (OMP), Institut de Recherche pour le Développement (IRD)-Université Toulouse III - Paul Sabatier (UT3), Université de Toulouse (UT)-Université de Toulouse (UT)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National d'Études Spatiales [Toulouse] (CNES)-Centre National de la Recherche Scientifique (CNRS)-Météo-France -Institut de Recherche pour le Développement (IRD)-Université Toulouse III - Paul Sabatier (UT3), Université de Toulouse (UT)-Université de Toulouse (UT)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National d'Études Spatiales [Toulouse] (CNES)-Centre National de la Recherche Scientifique (CNRS)-Météo-France -Centre National de la Recherche Scientifique (CNRS), Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Institut national des sciences de l'Univers (INSU - CNRS)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS), and Météo France-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)
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Western Mediterranean ,Research groups ,Numerical weather prediction model ,Teledetecció ,010504 meteorology & atmospheric sciences ,Meteorology ,Human life ,AROME ,Mesoscale meteorology ,[SDU.STU.ME]Sciences of the Universe [physics]/Earth Sciences/Meteorology ,Enginyeria de la telecomunicació::Radiocomunicació i exploració electromagnètica [Àrees temàtiques de la UPC] ,01 natural sciences ,7. Clean energy ,Weather forecasting ,010309 optics ,Troposphere ,0103 physical sciences ,Precipitation ,0105 earth and related environmental sciences ,General Environmental Science ,[PHYS.PHYS.PHYS-AO-PH]Physics [physics]/Physics [physics]/Atmospheric and Oceanic Physics [physics.ao-ph] ,Previsió del temps ,Remote sensing ,Numerical weather prediction ,Radar òptic ,Lidar ,13. Climate action ,Assimilation ,General Earth and Planetary Sciences ,Environmental science ,Water vapor - Abstract
The version of record is available online at: http://dx.doi.org/10.1007/s42865-021-00037-6 Extreme heavy precipitation events (HPEs) pose a threat to human life but remain difficult to predict because of the lack of adequate high frequency and high-resolution water vapor (WV) observations in the low troposphere (below 3 km). To fill this observational gap, we aim at implementing an integrated prediction tool, coupling network measurements of WV profiles, and a numerical weather prediction model to precisely estimate the amount, timing, and location of rainfall associated with HPEs in southern France (struck by¿~¿7 HPEs per year on average during the fall). The Water vapor Lidar Network Assimilation (WaLiNeAs) project will deploy a network of 6 autonomous Raman WV lidars around the Western Mediterranean to provide measurements with high vertical resolution and accuracy to be assimilated in the French Application of Research to Operations at Mesoscale (AROME-France) model, using a four-dimensional ensemble-variational approach with 15-min updates. This integrated prediction tool is expected to enhance the model capability for kilometer-scale prediction of HPEs over southern France up to 48 h in advance. The field campaign is scheduled to start early September 2022, to cover the period most propitious to heavy precipitation events in southern France. The Raman WV lidar network will be operated by a consortium of French, German, Italian, and Spanish research groups. This project will lead to recommendations on the lidar data processing for future operational exploitation in numerical weather prediction (NWP) systems.
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- 2021
13. An automatic observation-based aerosol typing method for EARLINET
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N. Papagiannopoulos, L. Mona, A. Amodeo, G. D'Amico, P. Gumà Claramunt, G. Pappalardo, L. Alados-Arboledas, J. L. Guerrero-Rascado, V. Amiridis, P. Kokkalis, A. Apituley, H. Baars, A. Schwarz, U. Wandinger, I. Binietoglou, D. Nicolae, D. Bortoli, A. Comerón, A. Rodríguez-Gómez, M. Sicard, A. Papayannis, M. Wiegner, Universitat Politècnica de Catalunya. Departament de Teoria del Senyal i Comunicacions, and Universitat Politècnica de Catalunya. RSLAB - Grup de Recerca en Teledetecció
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Atmospheric Science ,Teledetecció ,SPECTRAL-RESOLUTION LIDAR ,010504 meteorology & atmospheric sciences ,aerosol ,Computer science ,QC1-999 ,Atmospheric physics ,EYJAFJALLAJOKULL VOLCANIC CLOUD ,aerosol formation ,data set ,010501 environmental sciences ,7. Clean energy ,01 natural sciences ,DEPOLARIZATION RATIO ,Single calculus ,lcsh:Chemistry ,Set (abstract data type) ,volcanic ash ,Mixed dust ,LONG-RANGE TRANSPORT ,QD1-999 ,MICROPHYSICAL PROPERTIES ,lidar ,SAHARAN DUST EVENT ,0105 earth and related environmental sciences ,Remote sensing ,particulate matter ,Mahalanobis distance ,algorithm ,MULTIWAVELENGTH RAMAN LIDAR ,Physics ,aerosol composition ,Supervised learning ,IBERIAN PENINSULA ,OPTICAL-PROPERTIES ,Function (mathematics) ,lcsh:QC1-999 ,Aerosol ,Chemistry ,BIOMASS BURNING EPISODE ,Lidar ,lcsh:QD1-999 ,Enginyeria de la telecomunicació::Radiocomunicació i exploració electromagnètica::Teledetecció [Àrees temàtiques de la UPC] ,13. Climate action ,Física atmosfèrica ,lcsh:Physics - Abstract
We present an automatic aerosol classification method based solely on the European Aerosol Research Lidar Network (EARLINET) intensive optical parameters with the aim of building a network-wide classification tool that could provide near-real-time aerosol typing information. The presented method depends on a supervised learning technique and makes use of the Mahalanobis distance function that relates each unclassified measurement to a predefined aerosol type. As a first step (training phase), a reference dataset is set up consisting of already classified EARLINET data. Using this dataset, we defined 8 aerosol classes: clean continental, polluted continental, dust, mixed dust, polluted dust, mixed marine, smoke, and volcanic ash. The effect of the number of aerosol classes has been explored, as well as the optimal set of intensive parameters to separate different aerosol types. Furthermore, the algorithm is trained with literature particle linear depolarization ratio values. As a second step (testing phase), we apply the method to an already classified EARLINET dataset and analyze the results of the comparison to this classified dataset. The predictive accuracy of the automatic classification varies between 59% (minimum) and 90% (maximum) from 8 to 4 aerosol classes, respectively, when evaluated against pre-classified EARLINET lidar. This indicates the potential use of the automatic classification to all network lidar data. Furthermore, the training of the algorithm with particle linear depolarization values found in the literature further improves the accuracy with values for all the aerosol classes around 80 %. Additionally, the algorithm has proven to be highly versatile as it adapts to changes in the size of the training dataset and the number of aerosol classes and classifying parameters. Finally, the low computational time and demand for resources make the algorithm extremely suitable for the implementation within the single calculus chain (SCC), the EARLINET centralized processing suite., The research leading to these results has received funding from the European Union’s Horizon 2020 research and innovation program under grant agreement no. 602014 (project ECARS – East European Centre for Atmospheric Remote Sensing) and from the European Union’s Horizon 2020 research program for societal challenges – smart, green and integrated transport under grant agreement no. 723986 (project EUNADICS-AV – European Natural Disaster Coordination and Information System for Aviation).
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- 2018
14. Dual pure-rotational Raman channel design and implementation in a multiwavelength lidar system for the monitoring of aerosol optical properties
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Daniel-Camilo Fortunato-dos-Santos-Oliveira, Michaël Sicard, Adolfo Comerón-Tejero, Constantino Muñoz-Porcar, Alejandro Rodríguez-Gómez, and José-Alex Zenteno-Hernández
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symbols.namesake ,Optics ,Lidar ,Materials science ,business.industry ,symbols ,business ,Raman spectroscopy ,Communication channel ,Dual (category theory) ,Aerosol - Abstract
Pure-rotational Raman (PRR) scattering has proven to be an efficient technique for the determination of atmospheric aerosol optical properties for lidar applications. We present the implementation of a UV-PRR and the design of a VIS-PRR in the EARLINET/UPC multi-wavelength lidar system (Barcelona, Spain). State-of-the-art computations of N2 and O2 differential backscatter cross-sections weighted by the optical losses inside the optical separation unit of the system allow for the theoretical estimation of the expected signal-to-noise ratios (SNR) in both UV and VIS channels. By means of customized optical interference filters UV-PRR signals from atmospheric N2 and O2 were detected and compared to the classical vibro-rotational Raman signals. UV-PRR detected signals have shown to possess high SNR and relative uncertainty levels lower than a tolerable 15% for daytime and nighttime measurements. The theoretical analysis of the VIS-PRR channel augurs improvements similar to those observed with the UV-PRR channel.
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- 2021
15. A Comparative Analysis of Aerosol Optical Coefficients and Their Associated Errors Retrieved from Pure-Rotational and Vibro-Rotational Raman Lidar Signals
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Michaël Sicard, José Alex Zenteno-Hernández, Giuseppe D'Amico, Alejandro Rodríguez-Gómez, Adolfo Comerón, Constantino Muñoz-Porcar, Universitat Politècnica de Catalunya. Departament de Teoria del Senyal i Comunicacions, and Universitat Politècnica de Catalunya. RSLAB - Grup de Recerca en Teledetecció
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Daytime ,010504 meteorology & atmospheric sciences ,Backscatter ,Optical radar ,Aerosols atmosfèrics ,lcsh:Chemical technology ,01 natural sciences ,Biochemistry ,Article ,Analytical Chemistry ,symbols.namesake ,Experiment ,vibro-rotational lines ,Calibration ,lcsh:TP1-1185 ,Theory ,Electrical and Electronic Engineering ,theory ,Instrumentation ,0105 earth and related environmental sciences ,Remote sensing ,Physics ,experiment ,010401 analytical chemistry ,daytime ,Pure rotational lines ,Molar absorptivity ,Atmospheric aerosols ,Radar òptic ,pure rotational lines ,Atomic and Molecular Physics, and Optics ,Extinction retrieval ,0104 chemical sciences ,Aerosol ,Lidar ,Enginyeria de la telecomunicació::Radiocomunicació i exploració electromagnètica::Teledetecció [Àrees temàtiques de la UPC] ,Extinction (optical mineralogy) ,extinction retrieval ,Raman lidar ,symbols ,Vibro-rotational lines ,Raman spectroscopy - Abstract
This paper aims to quantify the improvement obtained with a purely rotational Raman (PRR) channel over a vibro-rotational Raman (VRR) channel, used in an aerosol lidar with elastic and Raman channels, in terms of signal-to-noise ratio (SNR), effective vertical resolution, and absolute and relative uncertainties associated to the retrieved aerosol optical (extinction and backscatter) coefficients. Measurements were made with the European Aerosol Research Lidar Network/Universitat Politècnica de Catalunya (EARLINET/UPC) multi-wavelength lidar system enabling a PRR channel at 353.9 nm, together with an already existing VRR (386.7 nm) and an elastic (354.7 nm) channels. Inversions were performed with the EARLINET Single Calculus Chain (SCC). When using PRR instead of VRR, the measurements show a gain in SNR of a factor 2.8 and about 7.6 for 3-h nighttime and daytime measurements, respectively. For 3-h nighttime (daytime) measurements the effective vertical resolution is reduced by 17% (20%), the absolute uncertainty (associated to the extinction) is divided by 2 (10) and the relative uncertainty is divided by 3 (7). During daytime, VRR extinction coefficient is retrieved in a limited height range (<, 2.2 km) preventing the SCC from finding a suitable calibration range in the search height range. So the advantage of using PRR instead of VRR is particularly evidenced in daytime conditions. For nighttime measurements, decreasing the time resolution from 3 to 1 h has nearly no effect on the relative performances of PRR vs. VRR.
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- 2021
- Full Text
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16. Synergy of Raman lidar and modeled temperature for relative humidity profiling: assessment and uncertainty analysis
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María José Granados-Muñoz, David Garcia-Vizcaino, Ruben Barragan, Adolfo Comerón, Francesc Rocadenbosch, Alejandro Rodríguez-Gómez, Constantino Muñoz-Porcar, Michaël Sicard, Universitat Politècnica de Catalunya. Departament de Teoria del Senyal i Comunicacions, Universitat Politècnica de Catalunya. Doctorat en Teoria del Senyal i Comunicacions, and Universitat Politècnica de Catalunya. RSLAB - Grup de Recerca en Teledetecció
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Teledetecció ,010504 meteorology & atmospheric sciences ,Nitrogen ,Enginyeria de la telecomunicació::Radiocomunicació i exploració electromagnètica::Radar [Àrees temàtiques de la UPC] ,0211 other engineering and technologies ,02 engineering and technology ,Atmospheric model ,Optical radar ,01 natural sciences ,Temperature measurement ,Atmospheric measurements ,Standard deviation ,law.invention ,law ,Humitat atmosfèrica ,Relative humidity ,Electrical and Electronic Engineering ,Uncertainty analysis ,0105 earth and related environmental sciences ,Remote sensing ,Water vapor ,021110 strategic, defence & security studies ,Relative humidity (RH) ,Uncertainty ,Humidity ,Radar òptic ,Laser radar ,Atmospheric modeling ,Lidar ,13. Climate action ,Raman lidar ,Radiosonde ,General Earth and Planetary Sciences ,Environmental science ,Instruments - Abstract
Relative humidity (RH) profiling using Raman lidars requires simultaneous range-resolved temperature and pressure data that are not always available. We propose and assess a method based on the use of a locally retrieved atmospheric model to estimate the temperature and pressure profiles. This model relies on the data from daily radiosonde launches at Barcelona during a five-year-long period (2015-2019). We have computed the range-resolved error of the model compared with the radiosonde ``true'' temperature profiles. Then, we have calculated the induced uncertainty in the recalculated RH profiles, finding that the standard deviation at 5 km is
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- 2021
17. Near-surface and columnar measurements with a micro pulse lidar of atmospheric pollen in Barcelona, Spain
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M. Sicard, R. Izquierdo, M. Alarcón, J. Belmonte, A. Comerón, J. M. Baldasano, Universitat Politècnica de Catalunya. Departament de Teoria del Senyal i Comunicacions, Universitat Politècnica de Catalunya. Departament de Física, Universitat Politècnica de Catalunya. Departament d'Enginyeria de Projectes i de la Construcció, Universitat Politècnica de Catalunya. RSLAB - Grup de Recerca en Teledetecció, and Universitat Politècnica de Catalunya. GReCT - Grup de Recerca de Ciències de la Terra
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Atmospheric Science ,Teledetecció ,010504 meteorology & atmospheric sciences ,Meteorology ,Pollination ,Atmospheric sciences ,medicine.disease_cause ,01 natural sciences ,lcsh:Chemistry ,010309 optics ,Diurnal cycle ,Optical-properties ,Pollen ,0103 physical sciences ,medicine ,Depolarization ratio ,otorhinolaryngologic diseases ,Variability ,0105 earth and related environmental sciences ,Aerosols ,biology ,Height ,Temperature ,food and beverages ,Depolarization ,Dust ,Remote sensing ,Allergens ,biology.organism_classification ,Atmosphere -- Laser observations ,lcsh:QC1-999 ,Plume ,Atmosfera -- Observacions amb làser ,Lidar ,Platanus ,Particles ,lcsh:QD1-999 ,Enginyeria de la telecomunicació::Radiocomunicació i exploració electromagnètica::Teledetecció [Àrees temàtiques de la UPC] ,Meteorological paremeters ,Environmental science ,lcsh:Physics - Abstract
We present for the first time continuous hourly measurements of pollen near-surface concentration and lidar-derived profiles of particle backscatter coefficients and of volume and particle depolarization ratios during a 5-day pollination event observed in Barcelona, Spain, between 27 and 31 March 2015. Daily average concentrations ranged from 1082 to 2830aEuro-pollenaEuro-m(-3). Platanus and Pinus pollen types represented together more than 80aEuro-% of the total pollen. Maximum hourly pollen concentrations of 4700 and 1200aEuro-m(-3) were found for Platanus and Pinus, respectively. Every day a clear diurnal cycle caused by the vertical transport of the airborne pollen was visible on the lidar-derived profiles with maxima usually reached between 12:00 and 15:00aEuro-UT. A method based on the lidar polarization capabilities was used to retrieve the contribution of the pollen to the total aerosol optical depth (AOD). On average the diurnal (09:00-17:00aEuro-UT) pollen AOD was 0.05, which represented 29aEuro-% of the total AOD. Maximum values of the pollen AOD and its contribution to the total AOD reached 0.12 and 78aEuro-%, respectively. The diurnal means of the volume and particle depolarization ratios in the pollen plume were 0.08 and 0.14, with hourly maxima of 0.18 and 0.33, respectively. The diurnal mean of the height of the pollen plume was found at 1.24aEuro-km with maxima varying in the range of 1.47-1.78aEuro-km. A correlation study is performed (1) between the depolarization ratios and the pollen near-surface concentration to evaluate the ability of the former parameter to monitor pollen release and (2) between the depolarization ratios as well as pollen AOD and surface downward solar fluxes, which cause the atmospheric turbulences responsible for the particle vertical motion, to examine the dependency of the depolarization ratios and the pollen AOD upon solar fluxes. For the volume depolarization ratio the first correlation study yields to correlation coefficients ranging 0.00-0.81 and the second to correlation coefficients ranging 0.49-0.86.
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- 2021
18. The unprecedented 2017–2018 stratospheric smoke event: decay phase and aerosol properties observed with the EARLINET
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Holger Baars, Albert Ansmann, Kevin Ohneiser, Moritz Haarig, Ronny Engelmann, Dietrich Althausen, Ingrid Hanssen, Michael Gausa, Aleksander Pietruczuk, Artur Szkop, Iwona S. Stachlewska, Dongxiang Wang, Jens Reichhardt, Annett Skupin, Ina Mattis, Thomas Trickl, Hannes Vogelmann, Francisco Navas-Guzmán, Alexander Haefele, Karen Acheson, Albert A. Ruth, Boyan Tatarov, Detlef Müller, Qiaoyun Hu, Thierry Podvin, Philippe Goloub, Igor Vesselovski, Christophe Pietras, Martial Haeffelin, Patrick Fréville, Michaël Sicard, Adolfo Comerón, Alfonso Javier Fernández García, Francisco Molero Menéndez, Carmen Córdoba-Jabonero, Juan Luis Guerrero-Rascado, Lucas Alados-Arboledas, Daniele Bortoli, Maria João Costa, Davide Dionisi, Gian Luigi Liberti, Xuan Wang, Alessia Sannino, Nikolaos Papagiannopoulos, Antonella Boselli, Lucia Mona, Giuseppe D'Amico, Salvatore Romano, Maria Rita Perrone, Livio Belegante, Doina Nicolae, Ivan Grigorov, Anna Gialitaki, Vassilis Amiridis, Ourania Soupiona, Alexandros Papayannis, Rodanthi-Elisaveth Mamouri, Argyro Nisantzi, Birgit Heese, Julian Hofer, Yoav Y. Schechner, Ulla Wandinger, Gelsomina Pappalardo, Laboratoire d’Optique Atmosphérique - UMR 8518 (LOA), Institut national des sciences de l'Univers (INSU - CNRS)-Université de Lille-Centre National de la Recherche Scientifique (CNRS), Laboratoire de Météorologie Dynamique (UMR 8539) (LMD), Institut national des sciences de l'Univers (INSU - CNRS)-École polytechnique (X)-École des Ponts ParisTech (ENPC)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS)-Département des Géosciences - ENS Paris, École normale supérieure - Paris (ENS-PSL), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-École normale supérieure - Paris (ENS-PSL), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL), Observatoire de Physique du Globe de Clermont-Ferrand (OPGC), Institut national des sciences de l'Univers (INSU - CNRS)-Université Clermont Auvergne [2017-2020] (UCA [2017-2020])-Centre National de la Recherche Scientifique (CNRS), Baars, Holger, Ansmann, Albert, Ohneiser, Kevin, Haarig, Moritz, Engelmann, Ronny, Althausen, Dietrich, Hanssen, Ingrid, Gausa, Michael, Pietruczuk, Aleksander, Szkop, Artur, Stachlewska, Iwona S., Wang, Dongxiang, Reichardt, Jen, Skupin, Annett, Mattis, Ina, Trickl, Thoma, Vogelmann, Hanne, Navas-Guzmán, Francisco, Haefele, Alexander, Acheson, Karen, Ruth, Albert A., Tatarov, Boyan, Müller, Detlef, Hu, Qiaoyun, Podvin, Thierry, Goloub, Philippe, Veselovskii, Igor, Pietras, Christophe, Haeffelin, Martial, Fréville, Patrick, Sicard, Michaël, Comerón, Adolfo, Fernández García, Alfonso Javier, Molero Menéndez, Francisco, Córdoba-Jabonero, Carmen, Guerrero-Rascado, Juan Lui, Alados-Arboledas, Luca, Bortoli, Daniele, Costa, Maria João, Dionisi, Davide, Liberti, Gian Luigi, Wang, Xuan, Sannino, Alessia, Papagiannopoulos, Nikolao, Boselli, Antonella, Mona, Lucia, D'Amico, Giuseppe, Romano, Salvatore, Perrone, Maria Rita, Belegante, Livio, Nicolae, Doina, Grigorov, Ivan, Gialitaki, Anna, Amiridis, Vassili, Soupiona, Ourania, Papayannis, Alexandro, Mamouri, Rodanthi-Elisaveth, Nisantzi, Argyro, Heese, Birgit, Hofer, Julian, Schechner, Yoav Y., Wandinger, Ulla, and Pappalardo, Gelsomina
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aerosol property ,Stratospheric aerosol observations ,black carbon ,atmospheric plume ,soot ,Remote Sensing ,Black carbon ,Soot ,Smoke ,INP concentrations ,Brewer-Dobson circulation system ,Northern Hemisphere ,Wild fire smoke ,Aerosols ,Lidar ,Stratosphere ,European Aerosol Research Lidar Network (EARLINET) ,Troposphere ,Atmospheric plume ,Smoke layer ,smoke ,troposphere ,[SDU]Sciences of the Universe [physics] ,stratosphere ,Earth and Related Environmental Sciences ,Natural Sciences ,Aerosol property - Abstract
International audience; Six months of stratospheric aerosol observations with the European Aerosol Research Lidar Network (EARLINET) from August 2017 to January 2018 are presented. The decay phase of an unprecedented, record-breaking stratospheric perturbation caused by wildfire smoke is reported and discussed in terms of geometrical, optical, and microphysical aerosol properties. Enormous amounts of smoke were injected into the upper troposphere and lower stratosphere over fire areas in western Canada on 12 August 2017 during strong thunderstorm-pyrocumulonimbus activity. The stratospheric fire plumes spread over the entire Northern Hemisphere in the following weeks and months. Twenty-eight European lidar stations from northern Norway to southern Portugal and the eastern Mediterranean monitored the strong stratospheric perturbation on a continental scale. The main smoke layer (over central, western, southern, and eastern Europe) was found at heights between 15 and 20 km since September 2017 (about 2 weeks after entering the stratosphere). Thin layers of smoke were detected at heights of up to 22-23 km. The stratospheric aerosol optical thickness at 532 nm decreased from values > 0.25 on 21-23 August 2017 to 0.005-0.03 until 5-10 September and was mainly 0.003-0.004 from October to December 2017 and thus was still significantly above the stratospheric background (0.001-0.002). Stratospheric particle extinction coefficients (532 nm) were as high as 50-200 Mm-1 until the beginning of September and on the order of 1 Mm-1 (0.5-5 Mm-1) from October 2017 until the end of January 2018. The corresponding layer mean particle mass concentration was on the order of 0.05-0.5 µg m-3 over these months. Soot particles (light-absorbing carbonaceous particles) are efficient ice-nucleating particles (INPs) at upper tropospheric (cirrus) temperatures and available to influence cirrus formation when entering the tropopause from above. We estimated INP concentrations of 50-500 L-1 until the first days in September and afterwards 5-50 L-1 until the end of the year 2017 in the lower stratosphere for typical cirrus formation temperatures of -55 ∘C and an ice supersaturation level of 1.15. The measured profiles of the particle linear depolarization ratio indicated a predominance of nonspherical smoke particles. The 532 nm depolarization ratio decreased slowly with time in the main smoke layer from values of 0.15-0.25 (August-September) to values of 0.05-0.10 (October-November) and < 0.05 (December-January). The decrease of the depolarization ratio is consistent with aging of the smoke particles, growing of a coating around the solid black carbon core (aggregates), and thus change of the shape towards a spherical form. We found ascending aerosol layer features over the most southern European stations, especially over the eastern Mediterranean at 32-35∘ N, that ascended from heights of about 18-19 to 22-23 km from the beginning of October to the beginning of December 2017 (about 2 km per month). We discuss several transport and lifting mechanisms that may have had an impact on the found aerosol layering structures.
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- 2019
19. Measurement report: Spectral and statistical analysis of aerosol hygroscopic growth from multi-wavelength lidar measurements in Barcelona, Spain.
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Sicard, Michaël, Fortunato dos Santos Oliveira, Daniel Camilo, Muñoz-Porcar, Constantino, Gil-Díaz, Cristina, Comerón, Adolfo, Rodríguez-Gómez, Alejandro, and Dios Otín, Federico
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MINERAL dusts ,AEROSOL analysis ,ATMOSPHERIC boundary layer ,CLOUD condensation nuclei ,ATMOSPHERIC aerosols ,WATER vapor ,LIDAR - Abstract
This paper presents the estimation of the hygroscopic growth parameter of atmospheric aerosols retrieved with a multi-wavelength lidar, a micro-pulse lidar (MPL) and daily radiosoundings in the coastal region of Barcelona, Spain. The hygroscopic growth parameter, γ , parameterizes the magnitude of the scattering enhancement in terms of the backscatter coefficient following Hänel parameterization. After searching for time-colocated lidar and radiosounding measurements (performed twice a day, all year round at 00:00 and 12:00 UTC), a strict criterion-based procedure (limiting the variations of magnitudes such as water vapor mixing ratio (WMVR), potential temperature, wind speed and direction) is applied to select only cases of aerosol hygroscopic growth. A spectral analysis (at the wavelengths of 355, 532 and 1064 nm) is performed with the multi-wavelength lidar, and a climatological one, at the wavelength of 532 nm, with the database of both lidars. The spectral analysis shows that below 2 km the regime of local pollution and sea salt γ decreases with increasing wavelengths. Since the 355 nm wavelength is sensitive to smaller aerosols, this behavior could indicate slightly more hygroscopic aerosols present at smaller size ranges. Above 2 km (the regime of regional pollution and residual sea salt) the values of γ at 532 nm are nearly the same as those below 2 km, and its spectral behavior is flat. This analysis and others from the literature are put together in a table presenting, for the first time, a spectral analysis of the hygroscopic growth parameter of a large variety of atmospheric aerosol hygroscopicities ranging from low (pure mineral dust, γ <0.2) to high (pure sea salt, γ > 1.0) hygroscopicity. The climatological analysis shows that, at 532 nm, γ is rather constant all year round and has a large monthly standard deviation, suggesting the presence of aerosols with different hygroscopic properties all year round. The annual γ is 0.55 ± 0.23. The height of the layer where hygroscopic growth was calculated shows an annual cycle with a maximum in summer and a minimum in winter. Former works describing the presence of recirculation layers of pollutants injected at various heights above the planetary boundary layer (PBL) may explain why γ , unlike the height of the layer where hygroscopic growth was calculated, is not season-dependent. The subcategorization of the whole database into No cloud and Below-cloud cases reveals a large difference of γ in autumn between both categories (0.71 and 0.33, respectively), possibly attributed to a depletion of inorganics at the point of activation into cloud condensation nuclei (CCN) in the Below-cloud cases. Our work calls for more in situ measurements to synergetically complete such studies based on remote sensing. [ABSTRACT FROM AUTHOR]
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- 2022
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20. Overview of the wew version 3 NASA Micro-Pulse Lidar Network (MPLNET) automatic precipitation detection algorithm
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James R. Campbell, Michaël Sicard, Leo Pio D'Adderio, Gelsomina Pappalardo, Gemine Vivone, Ellsworth J. Welton, Simone Lolli, Aldo Giunta, Ali Tokay, Adolfo Comerón, Jasper R. Lewis, Universitat Politècnica de Catalunya. Departament de Teoria del Senyal i Comunicacions, Universitat Politècnica de Catalunya. RSLAB - Grup de Recerca en Teledetecció, and European Space Agency
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Virga ,Teledetecció ,Science ,Image processing ,Network ,Precipitation ,Aerosol-cloud interactions ,lidar ,aerosol ,aerosol–cloud interactions ,MPLNET ,image processing ,precipitation ,network ,infrastructure ,virga ,Aerosoles ,Water cycle ,Aerosol ,Astrophysics::Galaxy Astrophysics ,Physics::Atmospheric and Oceanic Physics ,Lidar ,Infrastructure ,Remote sensing ,Ceilometer ,Aerosol–cloud interactions ,Enginyeria de la telecomunicació::Radiocomunicació i exploració electromagnètica::Teledetecció [Àrees temàtiques de la UPC] ,General Earth and Planetary Sciences ,Environmental science ,Drizzle ,Algorithm - Abstract
This article belongs to the Special Issue High Resolution Active Optical Remote Sensing Observations of Aerosols, Clouds and Aerosol-Cloud Interactions and Their Implication to Climate., Precipitation modifies atmospheric column thermodynamics through the process of evaporation and serves as a proxy for latent heat modulation. For this reason, a correct precipitation parameterization (especially for low-intensity precipitation) within global scale models is crucial. In addition to improving our modeling of the hydrological cycle, this will reduce the associated uncertainty of global climate models in correctly forecasting future scenarios, and will enable the application of mitigation strategies. In this manuscript we present a proof of concept algorithm to automatically detect precipitation from lidar measurements obtained from the National Aeronautics and Space Administration Micropulse lidar network (MPLNET). The algorithm, once tested and validated against other remote sensing instruments, will be operationally implemented into the network to deliver a near real time (latency, This research was funded by the Italian Research Council (CNR) Short Term Mobility Program. The NASA Micro-Pulse Lidar Network is supported by the NASA Earth Observing System (S. Platnick) and Radiation Sciences Program (H. Maring).
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- 2020
21. An automatic light rain detection algorithm on NASA MPLNET lidar observations in the frame of WMO GALION project
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Ellsworth J. Welton, Gemine Vivone, Michaël Sicard, Simone Lolli, Adolfo Comerón, and Jasper R. Lewis
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Infrastructure ,Lidar ,Virga ,Network ,Image processing ,Precipitation ,Aerosol-cloud interactions ,Ceilometer ,Aerosol ,AERONET ,Latent heat ,MPLNET ,Environmental science ,Water cycle ,Algorithm - Abstract
The water cycle strongly influences life on Earth. In particular, the precipitation modifies the atmospheric column thermodynamics through the process of evaporation and serves as a proxy for latent heat modulation. For this reason, a correct precipitation parameterization (especially low-intensity precipitation) at global scale, bedsides improving our understanding of the hydrological cycle, it is crucial to reduce the associated uncertainty of the global climate models to correctly forecast future scenarios, i.e. to apply fast mitigation strategies. In this study we developed an algorithm to automatically detect precipitation from lidar measurements obtained by the National and Aeronautics Space Administration (NASA) Micropulse lidar network (MPLNET) permanent observational site in Goddard. The algorithm, once full operational, will deliver in Near Real Time (latency 1.5h) a new rain mask product that will be publicly available on MPLNET website as part of the new Version 3 Level 1.5 data. The methodology, based on an image processing technique, can detect only light precipitation events (defined by intensity and duration) as the morphological filters used through the detection process are applied on the lidar volume depolarization ratio range corrected composite images, i.e. heavy rain events are unusable as the lidar signal is completely extinguished after few meters in the precipitation or no signal detected because of the water accumulated on the receiver optics. Results from the algorithm, besides filling a gap in precipitation and virga detection by radars, are of particular interest for the scientific community because will help to better understand long-term aerosol-cloud interactions and aerosol atmospheric removal (scavenging effect) by rain as multi-year database being available for several MPLNET permanent observational sites across the globe. Moreover, we developed the automatic algorithm at Universitat Politecnica de Catalunya (UPC) Barcelona, the unique permanent observation station member of MPLNET and the European Aerosol Lidar Network (EARLINET) In the future the algorithm can be then easily applied to any other lidar and/or ceilometer network infrastructure in the frame of World Meteorological Organization (WMO) Global Aerosol Watch (GAW) aerosol lidar observation network (GALION)
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- 2019
22. Extreme, wintertime Saharan dust intrusion in the Iberian Peninsula: Lidar monitoring and evaluation of dust forecast models during the February 2017 event
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Miguel Potes, Sara Basart, Ruben Barragan, Maria João Costa, Andrés Esteban Bedoya-Velásquez, Pedro Salvador, José Luis Gómez-Amo, Vanda Salgueiro, Juan Luis Guerrero-Rascado, Roberto Román, Adolfo Comerón, Alejandro Rodríguez-Gómez, Manuel Pujadas, Michaël Sicard, María P. Utrillas, Daniele Bortoli, Francisco Molero, Pablo Ortiz-Amezcua, J.A. Martínez-Lozano, Maria Jose Granados-Muñoz, Francesc Rocadenbosch, Rui Salgado, A.J. Fernández, Lucas Alados-Arboledas, Constantino Muñoz-Porcar, Jose Antonio Benavent-Oltra, Begoña Artíñano, Barcelona Supercomputing Center, Universitat Politècnica de Catalunya. Departament de Teoria del Senyal i Comunicacions, and Universitat Politècnica de Catalunya. RSLAB - Grup de Recerca en Teledetecció
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Atmospheric Science ,Teledetecció ,Pols mineral -- Tesis doctorals ,010504 meteorology & atmospheric sciences ,Backscatter ,Sun-photometer ,Energies [Àrees temàtiques de la UPC] ,Particle optical properties ,Forecast skill ,010501 environmental sciences ,Mineral dust ,Atmospheric sciences ,Extreme Saharan dust intrusion ,01 natural sciences ,Sun photometer ,Model evaluation ,0105 earth and related environmental sciences ,Multi-wavelength lidar ,Remote sensing ,Vertical distribution ,Dust forecast model ,AERONET ,Aerosol ,Plume ,Lidar ,Enginyeria de la telecomunicació::Radiocomunicació i exploració electromagnètica::Teledetecció [Àrees temàtiques de la UPC] ,13. Climate action ,Environmental science ,Dust control - Abstract
The research leading to these results has received funding from the H2020 program from the European Union (grant agreement no. 654109, 778349) and also from the Spanish Ministry of Industry, Economy and Competitiviness (MINECO, ref. CGL2013-45410-R, CGL2016-81092-R, CGL2017-85344-R, TEC2015-63832-P), the Spanish Ministry of Science, Innovation and Universities (ref. CGL2017-90884-REDT); the CommSensLab "Maria de Maeztu" Unity of Excellence (ref. MDM-2016-0600) financed by the Spanish Agencia Estatal de Investigación. Co-funding was also provided by the European Union through the European Regional Development Fund (ref. POCI-01-0145-FEDER-007690, ALT20-03-0145-FEDER-000004, ALT20-03-0145-FEDER-000011); by the Andalusia Regional Government (ref. P12-RNM-2409); by the Madrid Regional Government (projects TIGAS-CM, ref. Y2018/EMT-5177 and AIRTEC-CM, ref. P2018/EMT4329); by the University of Granada through “Plan Propio. Programa 9 Convocatoria 2013” and by the Portuguese Foundation for Science and Technology and national funding (ref. SFRH/BSAB/143164/2019). The BSC-DREAM8b and NNMB/BSC-Dust (now NMMB-MONARCH) model simulations were performed by the Mare Nostrum supercomputer hosted by the Barcelona Supercomputer Center (BSC). S. Basart acknowledges the AXA Research Fund for supporting aerosol research at the BSC through the AXA Chair on Sand and Dust Storms Fund, as well as the InDust project (COST Action CA16202). The authors gratefully acknowledge the NOAA Air Resources Laboratory (ARL) for the provision of the HYSPLIT transport and dispersion model and/or READY website (http://www.ready.noaa.gov) used in this publication., An unprecedented extreme Saharan dust event was registered in winter time from 20 to 23 February 2017 over the Iberian Peninsula (IP). We report on aerosol optical properties observed under this extreme dust intrusion through passive and active remote sensing techniques. For that, AERONET (AErosol RObotic NETwork) and EARLINET (European Aerosol Research LIdar NETwork) databases are used. The sites considered are: Barcelona (41.38°N, 2.17°E), Burjassot (39.51°N, 0.42°W), Cabo da Roca (38.78°N, 9.50°W), Évora (38.57°N, 7.91°W), Granada (37.16°N, 3.61°W) and Madrid (40.45°N, 3.72°W). Large aerosol optical depths (AOD) and low Ångström exponents (AE) are observed. An AOD of 2.0 at 675 nm is reached in several stations. A maximum peak of 2.5 is registered in Évora. During and around the peak of AOD, AEs close to 0 and even slightly negative are measured. With regard to vertically-resolved aerosol optical properties, particle backscatter coefficients as high as 15 Mm−1 sr−1 at 355 nm are recorded at the lidar stations. Layer-mean lidar ratios are found in the range 40–55 sr at 355 nm and 34–61 sr at 532 nm during the event. The particle depolarization ratios are found to be constant inside the dust layer, and consistent from one site to another. Layer-mean values vary in the range 0.19–0.31. Another remarkable aspect of the event is the limited vertical distribution of the dust plume which never exceeds 5 km. The extreme aspect of the event also presented a nice case for testing the ability of two dust forecast models, BSC-DREAM8b and NMMB/BSC-Dust, to reproduce the arrival, the vertical distribution and the intensity of the dust plume over a long-range transport region. In the particular case of the February 2017 dust event, we found a large underestimation in the forecast of the extinction coefficient provided by BSC-DREAM8b at all heights independently of the site. In contrast NMMB/BSC-Dust forecasts presented a better agreement with the observations, especially in southwestern part of the IP. With regard to the forecast skill as a function of lead time, no clear degradation of the prognostic is appreciated at 24, 48 and 72 h for Évora and Granada stations (South). However the prognostic does degrade (bias increases and/or correlation decreases) for Barcelona (North), which is attributed to the fact that Barcelona is at a greater distance from the source region and to the singularity of the event., Funding from the H2020 program from the European Union (grant agreement no. 654109, 778349), Spanish Ministry of Industry, Economy and Competitiviness (MINECO, ref. CGL2013-45410-R, CGL2016-81092-R, CGL2017-85344-R, TEC2015-63832-P), Spanish Ministry of Science, Innovation and Universities (ref. CGL2017-90884-REDT), CommSensLab "Maria de Maeztu" Unity of Excellence (ref. MDM-2016-0600) financed by the Spanish Agencia Estatal de Investigación, Co-funding was also provided by the European Union through the European Regional Development Fund (ref. POCI-01-0145-FEDER-007690, ALT20-03-0145-FEDER-000004, ALT20-03-0145-FEDER-000011), Andalusia Regional Government (ref. P12-RNM-2409); by the Madrid Regional Government (projects TIGAS-CM, ref. Y2018/EMT-5177 and AIRTEC-CM, ref. P2018/EMT4329), Portuguese Foundation for Science and Technology and national funding (ref. SFRH/BSAB/143164/2019)
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- 2019
23. The unprecedented 2017 - 2018 stratospheric smoke event: decay phase and aerosol properties observed with the EARLINET
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Baars, Holger, Ansmann, Albert, Ohneiser, Kevin, Haarig, Moritz, Engelmann, Ronny, Althausen, Dietrich, Hanssen, Ingrid, Gausa, Michael, Pietruczuk, Aleksander, Szkop, Artur, Stachlewska, Iwona S., Wang, Dongxiang, Reichardt, Jens, Skupin, Annett, Mattis, Ina, Trickl, Thomas, Vogelmann, Hannes, Navas-Guzmán, Francisco, Haefele, Alexander, Acheson, Karen, Ruth, Albert A., Tatarov, Boyan, Müller, Detlef, Hu, Qiaoyun, Podvin, Thierry, Goloub, Philippe, Veselovskii, Igor, Pietras, Christophe, Haeffelin, Martial, Fréville, Patrick, Sicard, Michaël, Comerón, Adolfo, Fernández García, Alfonso Javier, Molero Menéndez, Francisco, Córdoba-Jabonero, Carmen, Guerrero-Rascado, Juan Luis, Alados-Arboledas, Lucas, Bortoli, Daniele, Costa, Maria João, Dionisi, Davide, Liberti, Gian Luigi, Wang, Xuan, Sannino, Alessia, Papagiannopoulos, Nikolaos, Boselli, Antonella, Mona, Lucia, D&, apos, Amico, Giuseppe, Romano, Salvatore, Perrone, Maria Rita, Belegante, Livio, Nicolae, Doina, Grigorov, Ivan, Gialitaki, Anna, Amiridis, Vassilis, Soupiona, Ourania, Papayannis, Alexandros, Mamouri, Rodanthi-Elisaveth, Nisantzi, Argyro, Heese, Birgit, Hofer, Julian, Schechner, Yoav Y., Wandinger, Ulla, and Pappalardo, Gelsomina
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Earth sciences ,EARLINET ,stratospheric smoke ,ddc:550 ,lidar - Abstract
Six months of stratospheric aerosol observations with the European Aerosol Research Lidar Network (EARLINET) from August 2017 to January 2018 are presented. The decay phase of an unprecedented, record-breaking stratospheric perturbation caused by wildfire smoke is reported and discussed in terms of geometrical, optical, and microphysical aerosol properties. Enormous amounts of smoke were injected into the upper troposphere and lower stratosphere over fire areas in western Canada on 12 August 2017 during strong thunderstorm–pyrocumulonimbus activity. The stratospheric fire plumes spread over the entire Northern Hemisphere in the following weeks and months. Twenty-eight European lidar stations from northern Norway to southern Portugal and the eastern Mediterranean monitored the strong stratospheric perturbation on a continental scale. The main smoke layer (over central, western, southern, and eastern Europe) was found at heights between 15 and 20 km since September 2017 (about 2 weeks after entering the stratosphere). Thin layers of smoke were detected at heights of up to 22–23 km. The stratospheric aerosol optical thickness at 532 nm decreased from values > 0.25 on 21–23 August 2017 to 0.005–0.03 until 5–10 September and was mainly 0.003–0.004 from October to December 2017 and thus was still significantly above the stratospheric background (0.001–0.002). Stratospheric particle extinction coefficients (532 nm) were as high as 50–200 Mm−1 until the beginning of September and on the order of 1 Mm−1 (0.5–5 Mm−1) from October 2017 until the end of January 2018. The corresponding layer mean particle mass concentration was on the order of 0.05–0.5 µg m−3 over these months. Soot particles (light-absorbing carbonaceous particles) are efficient ice-nucleating particles (INPs) at upper tropospheric (cirrus) temperatures and available to influence cirrus formation when entering the tropopause from above. We estimated INP concentrations of 50–500 L−1 until the first days in September and afterwards 5–50 L−1 until the end of the year 2017 in the lower stratosphere for typical cirrus formation temperatures of −55 ∘C and an ice supersaturation level of 1.15. The measured profiles of the particle linear depolarization ratio indicated a predominance of nonspherical smoke particles. The 532 nm depolarization ratio decreased slowly with time in the main smoke layer from values of 0.15–0.25 (August–September) to values of 0.05–0.10 (October–November) and
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- 2019
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24. Introducing the atmospheric thermodynamics lidar in Space: ATLAS
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Roland Potthast, Philippe Keckhut, Alain Hauchecorne, Geraint Vaughan, Volker Wulfmeyer, Andreas Behrendt, Paolo Di Girolamo, David N. Whiteman, Mathias W. Rotach, Adolfo Comerón, Franco Marenco, Belay Demoz, Evelyne Richard, Joseph A. Santanello, Alan J. Geer, David D. Turner, Università degli studi della Basilicata [Potenza] (UNIBAS), Institut für Physik und Meteorologie [Stuttgart] (IPM), Universität Hohenheim, Universitat Politècnica de Catalunya [Barcelona] (UPC), STRATO - LATMOS, Laboratoire Atmosphères, Milieux, Observations Spatiales (LATMOS), Sorbonne Université (SU)-Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Centre National de la Recherche Scientifique (CNRS)-Institut national des sciences de l'Univers (INSU - CNRS)-Sorbonne Université (SU)-Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Centre National de la Recherche Scientifique (CNRS)-Institut national des sciences de l'Univers (INSU - CNRS), Laboratoire d'aérologie (LAERO), Centre National de la Recherche Scientifique (CNRS)-Observatoire Midi-Pyrénées (OMP), Météo France-Centre National d'Études Spatiales [Toulouse] (CNES)-Université Fédérale Toulouse Midi-Pyrénées-Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche pour le Développement (IRD)-Météo France-Centre National d'Études Spatiales [Toulouse] (CNES)-Université Fédérale Toulouse Midi-Pyrénées-Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche pour le Développement (IRD)-Université Toulouse III - Paul Sabatier (UT3), Université Fédérale Toulouse Midi-Pyrénées, United Kingdom Met Office [Exeter], National Centre for Atmospheric Science [Manchester] (NCAS), University of Manchester [Manchester], Federal Office of Meteorology and Climatology MeteoSwiss, European Centre for Medium-Range Weather Forecasts (ECMWF), University of Maryland [Baltimore County] (UMBC), University of Maryland System, NASA Goddard Space Flight Center (GSFC), NOAA Earth System Research Laboratory (ESRL), National Oceanic and Atmospheric Administration (NOAA), Universitat Politècnica de Catalunya. Departament de Teoria del Senyal i Comunicacions, Universitat Politècnica de Catalunya. RSLAB - Grup de Recerca en Teledetecció, Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Institut national des sciences de l'Univers (INSU - CNRS)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS)-Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Institut national des sciences de l'Univers (INSU - CNRS)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS), Université Toulouse III - Paul Sabatier (UT3), Université de Toulouse (UT)-Université de Toulouse (UT)-Observatoire Midi-Pyrénées (OMP), Institut de Recherche pour le Développement (IRD)-Université Toulouse III - Paul Sabatier (UT3), and Université de Toulouse (UT)-Université de Toulouse (UT)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National d'Études Spatiales [Toulouse] (CNES)-Centre National de la Recherche Scientifique (CNRS)-Météo-France -Institut de Recherche pour le Développement (IRD)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National d'Études Spatiales [Toulouse] (CNES)-Centre National de la Recherche Scientifique (CNRS)-Météo-France -Centre National de la Recherche Scientifique (CNRS)
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010504 meteorology & atmospheric sciences ,Backscatter ,Planetary boundary layer ,aerosol ,Enginyeria de la telecomunicació::Radiocomunicació i exploració electromagnètica::Radar [Àrees temàtiques de la UPC] ,Weather forecasting ,computer.software_genre ,Atmospheric thermodynamics ,Water vapour ,01 natural sciences ,010309 optics ,Troposphere ,0103 physical sciences ,Aerosol ,Physics::Atmospheric and Oceanic Physics ,0105 earth and related environmental sciences ,Remote sensing ,[PHYS.PHYS.PHYS-AO-PH]Physics [physics]/Physics [physics]/Atmospheric and Oceanic Physics [physics.ao-ph] ,Radar ,Temperature ,temperature ,water vapour ,Lidar ,13. Climate action ,Temporal resolution ,Raman lidar ,Environmental science ,Active remote sensing ,active remote sensing ,computer ,Water vapor - Abstract
Our understanding of the distribution of heat and water in the atmosphere still shows critical gaps on all temporal and spatial scales. This is mainly due to a lack of accurate measurements of water vapor and temperature profiles -hereafter called thermodynamic (TD) profiles -withhigh vertical and temporal resolution, especially in the lower troposphere. Accurate, high temporal-spatial resolution observations of TD profiles are essential for improving weather forecasting and re-analyses, for studying land-atmosphere feedback processes and for improving model parameterizations of land-surface and turbulent transport processes in the Atmospheric Boundary Layer. These observational gaps can be addressed with a new active remote sensing system in space based on the Raman lidar technique. Combining vibrational and rotational Raman backscatter signals, simultaneous measurements of water vapour and temperature profiles and a variety of derived variables are possible with unprecedented vertical and horizontal resolution, especially in the lower troposphere. This is the key concept of ATLAS, which was submitted in March 2018to the European Space Agency in response to the Call for Earth Explorer-10 Mission Ideas in the frame of ESAEOEP. An assessment of the expected performance of the systemand the specifications of the different lidar sub-systems has been performed based on the application ofan analytical simulation model for space-borne Raman lidar systems. Results from the simulations and technical aspects of the proposed mission will beillustrated at the conference.
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- 2018
25. Calculation of the Overlap Function and Associated Error of an Elastic Lidar or a Ceilometer: Cross-Comparison with a Cooperative Overlap-Corrected System
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Adolfo Comerón, Michaël Sicard, Alejandro Rodríguez-Gómez, Constantino Muñoz-Porcar, Universitat Politècnica de Catalunya. Departament de Teoria del Senyal i Comunicacions, and Universitat Politècnica de Catalunya. RSLAB - Grup de Recerca en Teledetecció
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Letter ,010504 meteorology & atmospheric sciences ,Optical radar ,lcsh:Chemical technology ,01 natural sciences ,Biochemistry ,Signal ,Analytical Chemistry ,010309 optics ,Error estimation ,Overlap function ,0103 physical sciences ,lcsh:TP1-1185 ,cross-comparison ,Electrical and Electronic Engineering ,Backscatter coefficient ,Instrumentation ,0105 earth and related environmental sciences ,Mathematics ,elastic lidar ,Radar òptic ,Geodesy ,Ceilometer ,Atomic and Molecular Physics, and Optics ,Elastic lidar ,overlap function ,Lidar ,Enginyeria de la telecomunicació::Radiocomunicació i exploració electromagnètica::Teledetecció [Àrees temàtiques de la UPC] ,error estimation ,Cross-comparison - Abstract
This paper establishes the relationship between the signal of a lidar system corrected for the incomplete overlap effect and the signal of another lidar system or a ceilometer for which the overlap function is unknown. Simple mathematical relationships permit the estimation of the overlap function of the second system as well as the associated error. Several overlap functions have been retrieved with this method over a period of 1.5 years with two lidar systems of the Universitat Politècnica de Catalunya, Barcelona, Spain. The error when the overlap function reaches 1 is usually less than 7%. The temporal variability estimated over a period of 1.5 years is less than 11% in the first 1.5 km from the surface and peaks at 18% at heights between 1.7 and 2.4 km. The use of a non-appropriate overlap function in the retrieval of the backscatter coefficient yield errors up to 60% in the first 0.5 km and up to 20% above. This research was funded by the H2020 program from the European Union (GA no. 654109, 778349), the Spanish Ministry of Economy, Industry and Competitiveness (ref. CGL2017-90884-REDT), the Spanish Ministry of Science and Innovation (ref. PID2019-103886RB-I00), and the Unity of Excellence “María de Maeztu” (ref. MDM-2016-0600) financed by the Spanish State Research Agency (AEI). The MPLNET project is funded by the NASA Radiation Sciences Program and Earth Observing System.
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- 2020
26. Aerosol radiative impact during the summer 2019 heatwave produced partly by an inter-continental Saharan dust outbreak – Part 1: Short-wave dust direct radiative effect.
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Córdoba-Jabonero, Carmen, Sicard, Michaël, López-Cayuela, María-Ángeles, Ansmann, Albert, Comerón, Adolfo, Zorzano, María-Paz, Rodríguez-Gómez, Alejandro, and Muñoz-Porcar, Constantino
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DUST ,MINERAL dusts ,AEROSOLS ,HEAT waves (Meteorology) ,SUMMER ,LIDAR ,PHOTOMETERS - Abstract
The short-wave (SW) direct radiative effect (DRE) during the summer 2019 heatwave produced partly by a moderate, long-lasting Saharan dust outbreak over Europe is analysed in this study. Two European sites (periods) are considered: Barcelona, Spain (23–30 June), and Leipzig, Germany (29 and 30 June), 1350 km apart from each other. Major data are obtained from AERONET and polarised Micro-Pulse Lidar (P-MPL) observations. Modelling is used to describe the different dust pathways, as observed at both sites. The coarse dust (Dc) and fine dust (Df) components (with total dust, DD = Dc + Df) are identified in the profiles of the total particle backscatter coefficient using the POLIPHON (POlarisation LIdar PHOtometer Networking) method in synergy with P-MPL measurements. This information is used to calculate the relative mass loading and the centre-of-mass height, as well as the contribution of each dust mode to the total dust DRE. Several aspects of the ageing of dust are put forward. The mean dust optical depth and its Df/DD ratios are, respectively, 0.153 and 24 % in Barcelona and 0.039 and 38 % in Leipzig; this Df increase in Leipzig is attributed to a longer dust transport path in comparison to Barcelona. The dust produced a cooling effect on the surface with a mean daily DRE of - 9.1 and - 2.5 Wm-2 , respectively, in Barcelona and Leipzig, but the Df/DD DRE ratio is larger for Leipzig (52 %) than for Barcelona (37 %). Cooling is also observed at the top of the atmosphere (TOA), although less intense than on the surface. However, the Df/DD DRE ratio at the TOA is even higher (45 % and 60 %, respectively, in Barcelona and Leipzig) than on the surface. Despite the predominance of Dc particles under dusty conditions, the SW radiative impact of Df particles can be comparable to, even higher than, that induced by the Dc ones. In particular, the Df/DD DRE ratio in Barcelona increases by + 2.4 %d-1 (surface) and + 2.9 %d-1 (TOA) during the dusty period. This study is completed by a second paper about the long-wave and net radiative effects. These results are especially relevant for the next ESA EarthCARE mission (planned in 2022) as it is devoted to aerosol–cloud–radiation interaction research. [ABSTRACT FROM AUTHOR]
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- 2021
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27. Fully Automated Light Precipitation Detection from MPLNET and EARLINET Network Lidar Measurements
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Gemine Vivone, Simone Lolli, Michaël Sicard, Ellsworth J. Welton, James R. Campbell, Jasper R. Lewis, Gelsomina Pappalardo, and Adolfo Comerón
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010504 meteorology & atmospheric sciences ,Meteorology ,Physics ,QC1-999 ,0211 other engineering and technologies ,02 engineering and technology ,01 natural sciences ,Aerosol ,Lidar ,CIRRUS CLOUD ,Fully automated ,General Circulation Model ,Latent heat ,Atmospheric column ,Water cycle ,021101 geological & geomatics engineering ,0105 earth and related environmental sciences - Abstract
The water cycle strongly influence life on Earth and precipitation especially modifies the atmospheric column thermodynamics through the evaporation process and serving as a proxy for latent heat modulation. For this reason, a correct light precipitation parameterization at global scale, it is of fundamental importance, bedsides improving our understanding of the hydrological cycle, to reduce the associated uncertainty of the global climate models to correctly forecast future scenarios. In this context we developed a full automatic algorithm based on morphological filters that, once operational, will make available a new rain product for the NASA Micropulse Lidar Network (MPLNET) and the European Aerosol Research Lidar Network (EARLINET) in the frame of WMO GALION Project
- Published
- 2020
28. Daytime aerosol extinction profiles from the combination of CALIOP profiles and AERONET products
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Adolfo Comerón, Roberto Pedrós, C. Marcos, María P. Utrillas, J. L. Gómez-Amo, Constantino Munoz, José A. Martínez-Lozano, and Michaël Sicard
- Subjects
Atmosphere ,Daytime ,Lidar ,Meteorology ,Extinction (optical mineralogy) ,law ,Environmental science ,Photometer ,Mineral dust ,Aerosol ,law.invention ,Remote sensing ,AERONET - Abstract
The solar background illumination has a strong effect on CALIOP (Cloud-Aerosol Lidar with Orthogonal Polarization) measurements, leading to a decrease in the signal-to-noise ratio of the lidar signal. Because of this, CALIOP level 2 data algorithms might be limited in the retrieval of the properties of the aerosols in the atmosphere. In this work, we present a methodology that combines CALIOP level 1 data with AERONET (Aerosol RObotic NETwork) measurements to retrieve aerosol extinction profiles and lidar ratios in daytime conditions. In this way, we fulfill a two-fold objective: first, we obtain more accurate daytime aerosol information; second, we supplement column integrated measurements from AERONET sun photometers with information about the vertical distribution of aerosols. The methodology has been applied to Burjassot (39.30° N, 0.25° W) and Barcelona (41.39° N, 2.11° E) AERONET stations in the Mediterranean coast of Spain in the period from June 2006 to September 2011. We have found good agreement for the extinction profiles in several study cases of ground lidar measurements in Barcelona, coincident with CALIOP overpasses. Finally, the methodology has proved to be useful for the study of special episodes such as Saharan dust outbreaks.
- Published
- 2018
29. Considerations about the determination of the depolarization calibration profile of a two-telescope lidar and its implications for volume depolarization ratio retrieval
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Adolfo Comerón, Alejandro Rodríguez-Gómez, Constantino Muñoz-Porcar, María José Granados-Muñoz, Francesc Rocadenbosch, Michaël Sicard, Ruben Barragan, Universitat Politècnica de Catalunya. Departament de Teoria del Senyal i Comunicacions, and Universitat Politècnica de Catalunya. RSLAB - Grup de Recerca en Teledetecció
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Teledetecció ,010504 meteorology & atmospheric sciences ,lcsh:Chemical technology ,01 natural sciences ,Biochemistry ,Article ,Analytical Chemistry ,law.invention ,010309 optics ,Telescope ,Optics ,law ,Position (vector) ,Error compensation ,0103 physical sciences ,Depolarization ratio ,Calibration ,lcsh:TP1-1185 ,depolarization channel ,Electrical and Electronic Engineering ,Instrumentation ,Physics::Atmospheric and Oceanic Physics ,0105 earth and related environmental sciences ,Physics ,Depolarization channel ,business.industry ,Lidar system ,Depolarization ,Polarizer ,Remote sensing ,calibration ,Depolarizing particles ,Atomic and Molecular Physics, and Optics ,error compensation ,Lidar ,Volume (thermodynamics) ,Enginyeria de la telecomunicació::Radiocomunicació i exploració electromagnètica::Teledetecció [Àrees temàtiques de la UPC] ,depolarizing particles ,lidar system ,business - Abstract
We propose a new method for calculating the volume depolarization ratio of light backscattered by the atmosphere and a lidar system that employs an auxiliary telescope to detect the depolarized component. It takes into account the possible error in the positioning of the polarizer used in the auxiliary telescope. The theory of operation is presented and then applied to a few cases for which the actual position of the polarizer is estimated, and the improvement of the volume depolarization ratio in the molecular region is quantified. In comparison to the method used before, i.e., without correction, the agreement between the volume depolarization ratio with correction and the theoretical value in the molecular region is improved by a factor of 2&ndash, 2.5.
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- 2018
30. An automatic observation-based typing method for EARLINET
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Matthias Wiegner, Nikolaos Papagiannopoulos, Juan Luis Guerrero-Rascado, Michaël Sicard, Daniele Bortoli, Ulla Wandinger, Holger Baars, Doina Nicolae, Panagiotis Kokkalis, Vassilis Amiridis, Ioannis Binietoglou, Alejandro Rodríguez-Gómez, Lucas Alados-Arboledas, Pilar Gumà Claramunt, Aldo Amodeo, Anja Schwarz, Alex Papayannis, Arnoud Apituley, Adolfo Comerón, Giuseppe D'Amico, Lucia Mona, and Gelsomina Pappalardo
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Set (abstract data type) ,Mahalanobis distance ,Lidar ,010504 meteorology & atmospheric sciences ,Computer science ,Supervised learning ,Range (statistics) ,Function (mathematics) ,01 natural sciences ,Single calculus ,0105 earth and related environmental sciences ,Remote sensing ,Aerosol - Abstract
We present an automatic aerosol classification method based solely on European Aerosol Research Lidar Network (EARLINET) intensive optical parameters with the aim of building a network-wide classification tool that could provide near-real-time aerosol typing information. The presented method depends on a supervised learning technique and makes use of the Mahalanobis distance function that relates each un-classified measurement to a pre-defined aerosol type. As a first step (training phase), a reference dataset is set up consisting of already classified EARLINET data. Using this dataset, we defined eight aerosol classes: clean continental, polluted continental, dust, mixed dust, polluted dust, mixed marine, smoke, and volcanic ash. The effect of the number of aerosol classes has been explored, as well as the optimal set of intensive parameters to separate different aerosol types. Furthermore, the algorithm is trained with literature particle linear depolarization ratio values. As a second step (testing phase), we apply the method to an already classified EARLINET dataset and analyse the results of the comparison to this classified dataset. The predictive accuracy of the automatic classification varies between 59 % (minimum) and 90 % (maximum) from 8 to 4 aerosol classes, respectively, when evaluated against pre-classified EARLINET lidar. This indicates the potential use of the automatic classification to all network lidar data. Furthermore, the training of the algorithm with particle linear depolarization values found in literature further improves the accuracy: the accuracy range is 69–93 % from 8 (69 %) to 4 (93 %) aerosol classes, respectively. Additionally, the algorithm has proven to be highly versatile as it adapts to changes in the size of the training dataset and the number of aerosol classes and classifying parameters. Finally, the low computational time and demand for resources make the algorithm extremely suitable for the implementation within the Single Calculus Chain (SCC), the EARLINET centralised processing suite.
- Published
- 2018
31. Vertically Resolved Precipitation Intensity Retrieved Through a Synergy Between the Ground-Based NASA MPLNET Lidar Network Measurements, Surface Disdrometer Datasets and an Analytical Model Solution
- Author
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José María Baldasano, Ali Tokay, Andrea Binci, Ruben Barragan, Joan Bech, Nicola Afflitto, Jasper R. Lewis, Ellsworth J. Welton, Adolfo Comerón, Sergi Gonzales, Alessandro Rea, Leo Pio D'Adderio, Simone Lolli, Michaël Sicard, and James R. Campbell
- Subjects
010504 meteorology & atmospheric sciences ,Meteorology ,Evaporation ,Climate change ,010501 environmental sciences ,01 natural sciences ,atmospheric_science ,Disdrometer ,Lidar ,Latent heat ,Environmental science ,Precipitation ,Intensity (heat transfer) ,0105 earth and related environmental sciences - Abstract
In this paper we illustrate a new, simple and complementary ground-based methodology to retrieve the vertically resolved atmospheric precipitation intensity through a synergy between measurements from the National Aeronautics and Space Administration (NASA) Micropulse Lidar network (MPLNET), an analytical model solution and ground-based disdrometer measurements. The presented results are obtained at two mid-latitude MPLNET permanent observational sites, located respectively at NASA Goddard Space Flight Center, USA, and at the Universitat Politècnica de Catalunya, Barcelona, Spain. The methodology is suitable to be applied to existing and/or future lidar/ceilometer networks with the main objective of either providing near-real time (3h latency) rainfall intensity measurements and/or to validate satellite missions, especially for critical light precipitation (
- Published
- 2018
32. February 2017 extreme Saharan dust outbreak in the Iberian Peninsula: from lidar-derived optical properties to evaluation of forecast models
- Author
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Ruben Barragan, Begoña Artíñano, Pablo Ortiz-Amezcua, Michaël Sicard, Pedro Salvador, Adolfo Comerón, José Luis Gómez-Amo, J.A. Martínez-Lozano, A.J. Fernández, Lucas Alados-Arboledas, Miguel Potes, Maria Jose Granados-Muñoz, Vanda Salgueiro, Manuel Pujadas, Francesc Rocadenbosch, Rui Salgado, Maria João Costa, María P. Utrillas, Juan Luis Guerrero-Rascado, Constantino Muñoz-Porcar, Alejandro Rodríguez-Gómez, Daniele Bortoli, Andrés Esteban Bedoya-Velásquez, Jose Antonio Benavent-Oltra, Roberto Román, and Francisco Molero
- Subjects
geography ,geography.geographical_feature_category ,010504 meteorology & atmospheric sciences ,Backscatter ,010501 environmental sciences ,Mineral dust ,Winter time ,Atmospheric sciences ,01 natural sciences ,Aerosol ,AERONET ,Lidar ,Peninsula ,Range (statistics) ,Environmental science ,0105 earth and related environmental sciences - Abstract
An unprecedented extreme Saharan dust event was registered in winter time from 20 to 23 February 2017 over the Iberian Peninsula (IP). We report on aerosol optical properties observed under this extreme dust outbreak through remote sensing (active and passive) techniques. For that, EARLINET (European Aerosol Research LIdar NETwork) lidar and AERONET (AErosol RObotic NETwork) Sun-photometer Cimel CE 318 measurements are used. The sites considered are: Barcelona (41.38º N, 2.17º E), Burjassot (39.51º N, 0.42º W), Cabo da Roca (38.78º N, 9.50º W), Évora (38.57º N, 7.91º W), Granada (37.16º N, 3.61º W) and Madrid (40.45º N, 3.72º W). In general, large aerosol optical depths (AOD) and low Ångström exponents (AE) are observed. An AOD of 2.0 at 675 nm is reached in several stations. Maximum values of AOD675 of 2.5 are registered in Évora. During and around the peak of AOD675, AEs close to 0 are measured. With regard to vertically-resolved aerosol optical properties, particle backscatter coefficients as high as 1.5∙10−5 m−1 sr−1 at 355 nm are recorded at every lidar stations. Mean lidar ratios are found in the range 40–55 sr at 355 nm and 34–61 sr at 532 nm during the event inside the dust layer. Mean particle and volume depolarization ratios are found to be very consistent between lidar stations. They range 0.19–0.31 and 0.12–0.26 respectively. The optical properties are also found very stable with height in the dust layer. Another remarkable aspect of the event is the limited height of the dust transport which is found between the ground and 5 km. Our vertically-resolved aerosol properties are also used to estimate the performances of two dust models, namely BSC-DREAM8b and NMMB/BSC-Dust, in order to evaluate their forecast skills in such intense dust outbreaks. We found that forecasts provided by the NMMB/BSC-Dust show a better agreement with observations than the ones from BSC-DREAM8b. The BSC-DREAM8b forecasts (24 h) present a large underestimation during the event. No clear degradation of the prognostics is appreciated in 24, 48, 72 h except for the Barcelona station.
- Published
- 2018
33. Modelling of pollen dispersion in the atmosphere: evaluation with a continuous 1β+1δ lidar
- Author
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Oriol Jorba, Michaël Sicard, Concepción De Linares, José María Baldasano, Rebeca Izquierdo, Adolfo Comerón, Jordina Belmonte, Marta Alarcón, Universitat Politècnica de Catalunya. Departament de Teoria del Senyal i Comunicacions, Universitat Politècnica de Catalunya. Departament de Física, Universitat Politècnica de Catalunya. Departament d'Enginyeria de Projectes i de la Construcció, Universitat Politècnica de Catalunya. RSLAB - Grup de Recerca en Teledetecció, Universitat Politècnica de Catalunya. GRIC - Grup de Recerca i Innovació de la Construcció, and Barcelona Supercomputing Center
- Subjects
Simulations ,010504 meteorology & atmospheric sciences ,Pollination ,QC1-999 ,010501 environmental sciences ,Atmospheric sciences ,medicine.disease_cause ,01 natural sciences ,Aerosols -- Mesurament ,Micro pulse lidar ,Atmosphere ,Human health ,Pollen ,Dispersion (optics) ,medicine ,0105 earth and related environmental sciences ,Physics ,Enginyeria biomèdica [Àrees temàtiques de la UPC] ,Aerosols -- Measurement ,Circulació atmosfèrica ,Pollen--Dispersal--Climatic factors ,Lidar ,Pollen allergenicity ,Intensity (heat transfer) ,Desenvolupament humà i sostenible::Degradació ambiental::Contaminació atmosfèrica [Àrees temàtiques de la UPC] ,Biomedical and health research - Abstract
Pollen allergenicity plays an important role on human health and wellness. It is thus of large public interest to increase our knowledge of pollen grain behavior in the atmosphere (source, emission, processes involved during their transport, etc.) at fine temporal and spatial scales. First simulations with the Barcelona Supercomputing Center NMMB/BSC-CTM model of Platanus and Pinus dispersion in the atmosphere were performed during a 5-day pollination event observed in Barcelona, Spain, between 27 – 31 March, 2015. The simulations are compared to vertical profiles measured with the continuous Barcelona Micro Pulse Lidar system. First results show that the vertical distribution is well reproduced by the model in shape, but not in intensity, the model largely underestimating in the afternoon. Guidelines are proposed to improve the dispersion of airborne pollen by numerical prediction models. Lidar data analysis were supported by the ACTRIS (Aerosols, Clouds, and Trace Gases Research Infrastructure Network) Research Infrastructure Project funded by the European Union’s Horizon 2020 research and innovation programme under grant agreement n. 654169; by the Spanish Ministry of Economy and Competitivity (project TEC2015-63832-P) and of Science and Innovation (project UNPC10-4E-442) and EFRD (European Fund for Regional Development); by the Department of Economy and Knowledge of the Catalan autonomous government (grant 2014 SGR 583). This work is contributing to the ICTA 'Unit of Excellence' (Spanish Ministry of Economy and Competitivity, project MDM2015-0552).
- Published
- 2018
34. Vertically resolved precipitation intensity retrieved through a synergy between the ground-based NASA MPLNET lidar network measurements, surface disdrometer datasets and an analytical model solution
- Author
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Michaël Sicard, José María Baldasano, Ellsworth J. Welton, Adolfo Comerón, Joan Bech, Ali Tokay, James R. Campbell, Fabio Madonna, Sergi Gonzalez, Jasper R. Lewis, Ruben Barragan, Andrea Binci, Nicola Afflitto, Leo Pio D'Adderio, Simone Lolli, Alessandro Rea, Universitat Politècnica de Catalunya. Departament de Teoria del Senyal i Comunicacions, Universitat Politècnica de Catalunya. Departament d'Enginyeria de Projectes i de la Construcció, Universitat Politècnica de Catalunya. RSLAB - Grup de Recerca en Teledetecció, Universitat Politècnica de Catalunya. GRIC - Grup de Recerca i Innovació de la Construcció, and Universitat de Barcelona
- Subjects
Rainfall ,Latent heat ,Teledetecció ,010504 meteorology & atmospheric sciences ,Evaporation (Meteorology) ,rainfall ,Evaporation ,0211 other engineering and technologies ,02 engineering and technology ,latent heat ,Precipitation ,precipitation ,01 natural sciences ,Optical measurements ,evaporation ,Disdrometer ,Meteorology ,disdrometer ,Climate change ,MPLNET ,meteorology ,lcsh:Science ,lidar ,021101 geological & geomatics engineering ,0105 earth and related environmental sciences ,Remote sensing ,Lidar ,Precipitacions (Meteorologia) ,Evaporació (Meteorologia) ,Mesuraments òptics ,Ceilometer ,Pluja ,Precipitations (Meteorology) ,climate change ,Rain and rainfall ,Enginyeria de la telecomunicació::Radiocomunicació i exploració electromagnètica::Teledetecció [Àrees temàtiques de la UPC] ,General Earth and Planetary Sciences ,Environmental science ,Satellite ,lcsh:Q ,Space Science ,Intensity (heat transfer) - Abstract
In this paper, we illustrate a new, simple and complementary ground-based methodology to retrieve the vertically resolved atmospheric precipitation intensity through a synergy between measurements from the National Aeronautics and Space Administration (NASA) Micropulse Lidar network (MPLNET), an analytical model solution and ground-based disdrometer measurements. The presented results are obtained at two mid-latitude MPLNET permanent observational sites, located respectively at NASA Goddard Space Flight Center, USA, and at the Universitat Politècnica de Catalunya, Barcelona, Spain. The methodology is suitable to be applied to existing and/or future lidar/ceilometer networks with the main objective of either providing near real-time (3 h latency) rainfall intensity measurements and/or to validate satellite missions, especially for critical light precipitation (
- Published
- 2018
35. An automatic aerosol classification for earlinet: application and results
- Author
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Giuseppe D'Amico, Aldo Amodeo, Doina Nicolae, P. Kokkalis, Ulla Wandinger, Gelsomina Pappalardo, Holger Baars, Daniele Bortoli, Anja Schwarz, Alex Papayannis, Vassilis Amiridis, Lucia Mona, P. Guma-Claramunt, Arnoud Apituley, Adolfo Comerón, Juan Luis Guerrero-Rascado, Matthias Wiegner, Lucas Alados-Arboledas, Nikolaos Papagiannopoulos, Ioannis Binietoglou, Universitat Politècnica de Catalunya. Departament de Teoria del Senyal i Comunicacions, and Universitat Politècnica de Catalunya. RSLAB - Grup de Recerca en Teledetecció
- Subjects
Mahalanobis distance ,Teledetecció ,010504 meteorology & atmospheric sciences ,Physics ,QC1-999 ,automatic aerosol ,010501 environmental sciences ,Remote sensing ,Aerosols atmosfèrics ,Atmospheric aerosols ,01 natural sciences ,Aerosol ,results ,Weather system ,Lidar ,Enginyeria de la telecomunicació::Radiocomunicació i exploració electromagnètica::Teledetecció [Àrees temàtiques de la UPC] ,13. Climate action ,Classification methods ,Air quality index ,Classifier (UML) ,application ,0105 earth and related environmental sciences ,Desenvolupament humà i sostenible::Degradació ambiental::Contaminació atmosfèrica [Àrees temàtiques de la UPC] - Abstract
Aerosol typing is essential for understanding the impact of the different aerosol sources on climate, weather system and air quality. An aerosol classification method for EARLINET (European Aerosol Research Lidar Network) measurements is introduced which makes use the Mahalanobis distance classifier. The performance of the automatic classification is tested against manually classified EARLINET data. Results of the application of the method to an extensive aerosol dataset will be presented. © The Authors, published by EDP Sciences, 2018.
- Published
- 2018
- Full Text
- View/download PDF
36. A 1-D radiative transfer study of mineral dust during CHARMEX/ADRIMED 2013 campaign
- Author
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Cyrielle Denjean, Constantino Muñoz-Porcar, Alejandro Rodríguez-Gómez, Luca Alados-Arboledas, Ruben Barragan, Maria Jose Granados-Muñoz, Jose Antonio Benavent-Oltra, Roberto Román, Adolfo Comerón, Michaël Sicard, Gérard Brogniez, Universitat Politècnica de Catalunya. Departament de Teoria del Senyal i Comunicacions, and Universitat Politècnica de Catalunya. RSLAB - Grup de Recerca en Teledetecció
- Subjects
Lidar ,Teledetecció ,010504 meteorology & atmospheric sciences ,Aircraft ,Single-scattering albedo ,Radiative forcing ,GAME ,Mineral dust ,Remote sensing ,Atmospheric sciences ,01 natural sciences ,AERONET ,Aerosol ,Atmospheric radiative transfer codes ,Enginyeria de la telecomunicació::Radiocomunicació i exploració electromagnètica::Teledetecció [Àrees temàtiques de la UPC] ,13. Climate action ,GRASP ,Radiative transfer ,Environmental science ,0105 earth and related environmental sciences - Abstract
A 1-D radiative transfer study is presented based on the measurements performed at Granada during a dust event within the framework of the ChArMEx/ADRIMED (Chemistry-Aerosol Mediterranean Experiment/Aerosol Direct Radiative Forcing on the Mediterranean Climate) campaign, during June 16-17, 2013. Ground-based AERONET and lidar measurements were performed and further processed with the GRASP algorithm to get spectrally-resolved profiles of extinction and single scattering albedo. Furthermore, the research aircraft ATR-42 made two flights above Granada providing vertical profiles of aerosol optical and microphysical properties together with measurements of broadband radiative fluxes. All of the ground-based and aircraft aerosol properties are used as input in the radiative transfer model GAME in order to evaluate its sensitivity to different input datasets. The aircraft fluxes are used for validation of the modelled ones.
- Published
- 2018
37. Calibration of Raman lidar water vapor mixing ratio measurements using zenithal measurements of diffuse sunlight and a radiative transfer model
- Author
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Adolfo Comerón, Ruben Barragan, Alejandro Rodríguez-Gómez, Michaël Sicard, David Garcia-Vizcaino, María José Granados-Muñoz, Francesc Rocadenbosch, Constantino Muñoz-Porcar, Universitat Politècnica de Catalunya. Departament de Teoria del Senyal i Comunicacions, and Universitat Politècnica de Catalunya. RSLAB - Grup de Recerca en Teledetecció
- Subjects
010504 meteorology & atmospheric sciences ,Enginyeria de la telecomunicació::Radiocomunicació i exploració electromagnètica::Radar [Àrees temàtiques de la UPC] ,Atmospheric model ,01 natural sciences ,Atmospheric measurements ,law.invention ,010309 optics ,symbols.namesake ,Atmospheric radiative transfer codes ,law ,0103 physical sciences ,Calibration ,Electrical and Electronic Engineering ,Raman ,0105 earth and related environmental sciences ,Remote sensing ,Water vapor ,Lidar ,Làsers ,Enginyeria electrònica::Optoelectrònica::Làser [Àrees temàtiques de la UPC] ,Radar ,Lasers ,Laser radar ,symbols ,Radiosonde ,General Earth and Planetary Sciences ,Environmental science ,Raman spectroscopy ,Raman scattering - Abstract
This is a postprint (author final draft) version of article that has been accepted for publication. A fully version can be found at: https://doi.org/10.1109/TGRS.2018.2851064 © 2018 IEEE. Personal use of this material is permitted. Permission from IEEE must be obtained for all other uses, in any current or future media, including reprinting/republishing this material for advertising or promotional purposes, creating new collective works, for resale or redistribution to servers or lists, or reuse of any copyrighted component of this work in other works. Among the different techniques available for measuring the atmospheric water vapor content, Raman lidars stand out as accurate instruments providing detailed profiles with high temporal and altitude resolution. Their principle is based on obtaining the range-resolved ratio of the lidar signals corresponding to Raman returns from water vapor and nitrogen molecules, which is proportional to the water vapor mixing ratio. To do this, it is necessary to determine a calibration factor, specific of each lidar instrument. A method for obtaining this parameter, based on zenith measurements of diffuse sunlight, on Raman scattering models and on simulations, using a radiative transfer model, to estimate sky radiances at the wavelengths of interest, has been applied to the lidar system of Universitat Politècnica de Catalunya (UPC; Technical University of Catalonia, Barcelona, Spain). A set of calibrations, performed between 2016 and 2017, has permitted assessing the calibration procedure and analyzing the stability of the calibration factor in the UPC instrument. Results show that although the calibration factor can remain stable for long periods of time, it can suffer sudden variations that make indispensable to implement a convenient and reliable procedure to perform regular calibrations. We show that the method, which can be applied to any lidar with water vapor and nitrogen Raman channels, can completely dispense with radiosonde data. The calibration method is validated by comparison with simultaneous radiosonde water vapor measurements. Limitations of radiosondes for validating--and eventually calibrating--water vapor Raman lidars have been revealed.
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- 2018
38. Generalization of optical, energy, and excess-noise parameters to compare capabilities of lidar with PMT/APD/SiPM
- Author
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Adolfo Comerón and Ravil R. Agishev
- Subjects
Engineering ,business.industry ,Generalization ,Detector ,ComputingMethodologies_IMAGEPROCESSINGANDCOMPUTERVISION ,Noise (electronics) ,Silicon photomultiplier ,Lidar ,Signal-to-noise ratio ,Electronic engineering ,business ,Optical energy ,Physics::Atmospheric and Oceanic Physics ,Energy (signal processing) - Abstract
Further developments of the comparative analysis methodology applied to capabilities of various lidar systems, from micro-lidars to systems employing the high power lasers, which use different receiving systems are conducted. Following the dimensionless parameterization approach and in order to simplify the capabilities prediction and systems comparison, to improve its clarity and expand applicability, we propose specific ways to generalize optical, energy and excess-noise parameters inherent to lidar atmospheric monitoring, taking into account their possible high-scale variability. The generalized approach is used as an example to compare lidars with PMT/APD/SiPM detectors. Features of the pro-posed approach in different conditions and applications are discussed.
- Published
- 2017
39. Aerosol Depolarization Ratio Measurement Capabilities for an Elastic LIDAR: Implementation and First Measurements
- Author
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Michaël Sicard, Eric Vidal, Adolfo Comerón, Enis Ben Chahed, Ruben Barragan, Alejandro Rodríguez-Gómez, Francesc Rocadenbosch, Constantino Muñoz-Porcar, and María José Granados-Muñoz
- Subjects
Optics ,Lidar ,Materials science ,business.industry ,Depolarization ratio ,Calibration ,business ,atmospheric_science ,Aerosol ,Remote sensing - Abstract
A new approach to the measurement with elastic lidar of depolarization produced by atmospheric aerosols is presented. The system uses two different telescopes: one for depolarization measurements and another for total-power measurements. The system architecture and principle of operation are described. The first experimental results are also presented, corresponding to a collection of atmospheric conditions over the city of Barcelona.
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- 2017
40. Contribution of EARLINET/ACTRIS to the summer 2013 Special Observing Period of the ChArMEx project: monitoring of a Saharan dust event over the western and central Mediterranean
- Author
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M. Sicard a, b, R. Barragan a, C. Muñoz-Porcar a, A. Comerón a, M. Mallet c, F. Dulac d, J. Pelon e, L. Alados Arboledas f, g, A. Amodeo h, A. Boselli h, i, J. A. Bravo-Aranda f, G. D'amico h, M. J. Granados Muñoz f, G. Leto j, J. L. Guerrero Rascado f, F. Madonna h, L. Mona h, G. Pappalardo h, M. R. Perrone k, P. Burlizzi k, F. Rocadenbosch a, A. Rodríguez-Gómez a, S. Scollo l, N. Spinelli i, m, G. Titos f, X. Wang i, n, R. Zanmar Sanchez j, Remote Sensing Laboratory [Barcelona] (RSLab), Universitat Politècnica de Catalunya [Barcelona] (UPC), Laboratoire d'aérologie (LAERO), Université Toulouse III - Paul Sabatier (UT3), Université de Toulouse (UT)-Université de Toulouse (UT)-Observatoire Midi-Pyrénées (OMP), Institut de Recherche pour le Développement (IRD)-Université Toulouse III - Paul Sabatier (UT3), Université de Toulouse (UT)-Université de Toulouse (UT)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National d'Études Spatiales [Toulouse] (CNES)-Centre National de la Recherche Scientifique (CNRS)-Météo-France -Institut de Recherche pour le Développement (IRD)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National d'Études Spatiales [Toulouse] (CNES)-Centre National de la Recherche Scientifique (CNRS)-Météo-France -Centre National de la Recherche Scientifique (CNRS), Laboratoire des Sciences du Climat et de l'Environnement [Gif-sur-Yvette] (LSCE), Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut national des sciences de l'Univers (INSU - CNRS)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS), Chimie Atmosphérique Expérimentale (CAE), Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut national des sciences de l'Univers (INSU - CNRS)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS)-Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut national des sciences de l'Univers (INSU - CNRS)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS), TROPO - LATMOS, Laboratoire Atmosphères, Milieux, Observations Spatiales (LATMOS), Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Université Pierre et Marie Curie - Paris 6 (UPMC)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Université Pierre et Marie Curie - Paris 6 (UPMC)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS), Departamento de Fisica Aplicada [Granada], Universidad de Granada = University of Granada (UGR), Instituto Interuniversitario de Investigacion del Sistema Tierra en Andalucia (IISTA-CEAMA), Istituto di Metodologie per l'Analisi Ambientale (IMAA), Consiglio Nazionale delle Ricerche [Potenza] (CNR), Laboratoire d'Astrophysique de Marseille (LAM), Aix Marseille Université (AMU)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National d'Études Spatiales [Toulouse] (CNES)-Centre National de la Recherche Scientifique (CNRS), Laboratoire de Météorologie Dynamique (UMR 8539) (LMD), Université Pierre et Marie Curie - Paris 6 (UPMC)-Institut national des sciences de l'Univers (INSU - CNRS)-École polytechnique (X)-École des Ponts ParisTech (ENPC)-Centre National de la Recherche Scientifique (CNRS)-Département des Géosciences - ENS Paris, École normale supérieure - Paris (ENS-PSL), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-École normale supérieure - Paris (ENS-PSL), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL), INAF - Osservatorio Astrofisico di Catania (OACT), Istituto Nazionale di Astrofisica (INAF), Dipartimento di Matematica e Fisica 'Ennio de Georgi', Università del Salento [Lecce], Istituto Nazionale di Geofisica e Vulcanologia - Sezione di Catania (INGV), Istituto Nazionale di Geofisica e Vulcanologia, Laboratoire de Physico-Chimie de l'Atmosphère (LPCA), Université du Littoral Côte d'Opale (ULCO)-Centre National de la Recherche Scientifique (CNRS), Dipartimento di Scienze Fisiche [Naples], University of Naples Federico II = Università degli studi di Napoli Federico II, Istituto Superconduttori, Materiali Innovativi e Dispositivi (SPIN), National Research Council of Italy | Consiglio Nazionale delle Ricerche (CNR), Centre National de la Recherche Scientifique (CNRS)-Observatoire Midi-Pyrénées (OMP), Météo France-Centre National d'Études Spatiales [Toulouse] (CNES)-Université Fédérale Toulouse Midi-Pyrénées-Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche pour le Développement (IRD)-Météo France-Centre National d'Études Spatiales [Toulouse] (CNES)-Université Fédérale Toulouse Midi-Pyrénées-Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche pour le Développement (IRD)-Université Toulouse III - Paul Sabatier (UT3), Université Fédérale Toulouse Midi-Pyrénées, Institut national des sciences de l'Univers (INSU - CNRS)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université de Versailles Saint-Quentin-en-Yvelines (UVSQ), Institut national des sciences de l'Univers (INSU - CNRS)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Institut national des sciences de l'Univers (INSU - CNRS)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université de Versailles Saint-Quentin-en-Yvelines (UVSQ), Universidad de Granada (UGR), Département des Géosciences - ENS Paris, École normale supérieure - Paris (ENS Paris), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-École normale supérieure - Paris (ENS Paris), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Centre National de la Recherche Scientifique (CNRS)-École des Ponts ParisTech (ENPC)-École polytechnique (X)-Institut national des sciences de l'Univers (INSU - CNRS)-Université Pierre et Marie Curie - Paris 6 (UPMC), Università degli studi di Napoli Federico II, Consiglio Nazionale delle Ricerche [Roma] (CNR), Sicard, M., Barragan, R., Muñoz Porcar, C., Comerón, A., Mallet, M., Dulac, F., Pelon, J., Alados Arboledas, L., Amodeo, A., Boselli, A., Bravo Aranda, J. A., D’Amico, G., Granados Muñoz, M. J., Leto, G., Guerrero Rascado, J. L., Madonna, F., Mona, L., Pappalardo, G., Perrone, Maria Rita, Burlizzi, Pasquale, Rocadenbosch, F., Rodríguez Gómez, A., Scollo, S., Spinelli, Nicola, Titos, G., Wang, Xiaoxia, Zanmar Sanchez, R., Universitat Politècnica de Catalunya. Departament de Teoria del Senyal i Comunicacions, Universitat Politècnica de Catalunya. RSLAB - Grup de Recerca en Teledetecció, Universitat Politècnica de Catalunya. CTE-CRAE - Grup de Recerca en Ciències i Tecnologies de l'Espai, Muñoz-Porcar, C., Bravo-Aranda, J. A., Perrone, M. R., Burlizzi, P., Rodríguez-Gómez, A., Spinelli, N., and Wang, X.
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Mediterranean climate ,Teledetecció ,010504 meteorology & atmospheric sciences ,Meteorology ,Mineral dust ,Mediterranean ,7. Clean energy ,01 natural sciences ,Mediterranean Basin ,010309 optics ,0103 physical sciences ,monitoring of a Saharan ,[SDU.STU.HY]Sciences of the Universe [physics]/Earth Sciences/Hydrology ,Optical depth ,0105 earth and related environmental sciences ,[PHYS.PHYS.PHYS-AO-PH]Physics [physics]/Physics [physics]/Atmospheric and Oceanic Physics [physics.ao-ph] ,[SDU.OCEAN]Sciences of the Universe [physics]/Ocean, Atmosphere ,Radiative forcing ,Remote sensing ,Trace gas ,Aerosol ,Lidar ,Enginyeria de la telecomunicació::Radiocomunicació i exploració electromagnètica::Teledetecció [Àrees temàtiques de la UPC] ,13. Climate action ,ChArMEx ,Contribution of EARLINET/ACTRIS ,summer 2013 ,General Earth and Planetary Sciences ,Environmental science ,Special Observing ,Earth and Planetary Sciences (all) - Abstract
International audience; In the framework of the Chemistry-Aerosol Mediterranean Experiment (ChArMEx; http://charmex.lsce.ipsl.fr/) initiative, a field campaign took place in the western Mediterranean Basin between 10 June and 5 July 2013 within the ADRIMED (Aerosol Direct Radiative Impact on the regional climate in the MEDiterranean region) project. The scientific objectives of ADRIMED are the characterization of the most common ‘Mediterranean aerosols’ and their direct radiative forcing (column closure and regional scale). During 15–24 June a multi-intrusion dust event took place over the western and central Mediterranean Basin. Extra measurements were carried out by some EARLINET/ACTRIS (European Aerosol Research Lidar Network /Aerosols, Clouds, and Trace gases Research InfraStructure Network, http://www.actris.net/) lidar stations in Spain and Italy, in particular on 22 June in support to the flight over southern Italy of the Falcon 20 aircraft involved in the campaign. This article describes the physical and optical properties of dust observed at the different lidar stations in terms of dust plume centre of mass, optical depth, lidar ratio, and particle depolarization ratio. To link the differences found in the origin of dust plumes, the results are discussed on the basis of back-trajectories and air- and space-borne lidars. This work puts forward the collaboration between a European research infrastructure (ACTRIS) and an international project (ChArMEx) on topics of interest for both parties, and more generally for the atmospheric community.
- Published
- 2016
41. VERTICALLY-RESOLVED CHARACTERIZATION OF THE FEBRUARY 2016 EXCEPTIONAL SAHARAN DUST EPISODE OVER THE IBERIAN PENINSULA BY FOUR EARLINET STATIONS
- Author
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Guerrero Rascado, Juan Luis, Costa, Maria João, Sicard, Michael, Gómez-Amo, J. L., Benavent-Oltra, J. A., Román, R., Bortoli, Daniele, Marcos, C., Ortiz-Amezcua, P., Cazorla, A., Comerón, A., Muñoz- Porcar, C., Rodríguez, A., and Alados-Arboledas, L.
- Subjects
desert dust ,lidar - Published
- 2017
42. Assessment of capabilities of lidar systems in day-and night-time under different atmospheric and internal-noise conditions
- Author
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Ravil R. Agishev, Adolfo Comerón, Universitat Politècnica de Catalunya. Departament de Teoria del Senyal i Comunicacions, and Universitat Politècnica de Catalunya. RSLAB - Grup de Recerca en Teledetecció
- Subjects
010302 applied physics ,Teledetecció ,media_common.quotation_subject ,Physics ,QC1-999 ,Internal noise ,Photodetector ,Remote sensing ,01 natural sciences ,010309 optics ,Lidar ,Enginyeria de la telecomunicació::Radiocomunicació i exploració electromagnètica::Teledetecció [Àrees temàtiques de la UPC] ,Sky ,0103 physical sciences ,Physics::Atmospheric and Oceanic Physics ,Dimensionless quantity ,Background radiation ,media_common - Abstract
As an application of the dimensionless parameterization concept proposed earlier for the characterization of lidar systems, the universal assessment of lidar capabilities in day and night conditions is considered. The dimensionless parameters encapsulate the atmospheric conditions, the lidar optical and optoelectronic characteristics, including the photodetector internal noise, and the sky background radiation. Approaches to ensure immunity of the lidar system to external background radiation are discussed. © The Authors, published by EDP Sciences, 2018.
- Published
- 2017
43. Origin and pathways of the mineral dust transport to two Spanish EARLINET sites: Effect on the observed columnar and range-resolved dust optical properties
- Author
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Juan Antonio Bravo-Aranda, Michaël Sicard, David García Vizcaíno, Alejandro Rodríguez, Francisco Rocadenbosch, María José Granados-Muñoz, Hassan Lyamani, Juan Luis Guerrero-Rascado, Adolfo Comerón, A. Valenzuela, Constantino Muñoz Porcar, Ruben Barragan, Florian Mandija, Lucas Alados-Arboledas, Universitat Politècnica de Catalunya. Departament de Teoria del Senyal i Comunicacions, Universitat Politècnica de Catalunya. RSLAB - Grup de Recerca en Teledetecció, and Universitat Politècnica de Catalunya. CTE-CRAE - Grup de Recerca en Ciències i Tecnologies de l'Espai
- Subjects
Atmospheric Science ,Angstrom exponent ,Teledetecció ,010504 meteorology & atmospheric sciences ,Range (biology) ,Dust plume geometrical structure ,010501 environmental sciences ,Mineral dust ,Atmospheric sciences ,01 natural sciences ,0105 earth and related environmental sciences ,Backward trajectories ,Aerosol optical properties ,Remote sensing ,Atmosphere -- Laser observations ,Plume ,AERONET ,Aerosol ,Saharan dust events ,Atmosfera -- Observacions amb làser ,Lidar ,Enginyeria de la telecomunicació::Radiocomunicació i exploració electromagnètica::Teledetecció [Àrees temàtiques de la UPC] ,13. Climate action ,Environmental science ,Satellite ,Barcelona and Granada EARLINET sites - Abstract
In this paper, is presented a method for estimation of the effect of the transport process to aerosol optical properties. Aerosol optical data retrieved by lidars and sun-photometer measurements, are applied to Saharan dust events observed simultaneously at the two EARLINET/AERONET sites of Barcelona and Granada during the periods of June–September of 2012 and 2013. For this purpose, elastic lidar profiles and sun-photometer columnar retrievals are analyzed together with satellite observations and dust forecast models. Granada presents more than twice Saharan dust outbreaks compared to Barcelona. The scenarios favoring the Saharan dust outbreaks are identified in both places. The mineral dust originating in the Sahara region and arriving at both stations is usually transport wither over the Atlas Mountains or through an Atlantic pathway. Analyses of dust events affecting both stations reveal how differences in the transport process lead to differences in the aerosol optical properties measured at each station. Mean dust related Ångström exponent is 1.8 times higher in Barcelona than in Granada. This difference is a result of the additional contribution of anthropogenic aerosol, mainly in the aerosol fine mode, during the transport of the mineral dust plume over the Iberian Peninsula., Andalusia Regional Government through the project P12-RNM-2409, Spanish Ministry of Economy and Competitiveness through the project CGL2013-45410-R
- Published
- 2017
44. Lidar with SiPM: Some capabilities and limitations in real environment
- Author
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Jordi Bach, Michaël Sicard, Ravil R. Agishev, Alejandro Rodríguez, Santiago Royo, Jordi Riu, Adolfo Comerón, Universitat Politècnica de Catalunya. Departament de Teoria del Senyal i Comunicacions, and Universitat Politècnica de Catalunya. RSLAB - Grup de Recerca en Teledetecció
- Subjects
Enginyeria electrònica::Optoelectrònica::Làser [Àrees temàtiques de la UPC] ,Lidar ,Physics::Instrumentation and Detectors ,Computer science ,SiPM ,Enginyeria electrònica::Optoelectrònica [Àrees temàtiques de la UPC] ,Detector ,PMT ,Atmospheric lidar ,Atmosphere -- Laser observations ,Atomic and Molecular Physics, and Optics ,Photon counting ,Electronic, Optical and Magnetic Materials ,Atmosfera -- Observacions amb làser ,Range (mathematics) ,Silicon photomultiplier ,Extinction (optical mineralogy) ,Sensitivity (control systems) ,Optoelectronics ,Electrical and Electronic Engineering ,Optoelectrònica ,Physics::Atmospheric and Oceanic Physics ,Remote sensing - Abstract
The purpose of the work is to demonstrate real capabilities and to give examples of SiPMs application in lidar technology in both analog and photon counting modes. The experimental research within an operating lidar complex adapted to implement the analog mode and photon counting measurements with subsequent inversions of atmospheric extinction and backscattering coefficients was conducted. Theoretical evaluations of potential limitations of atmospheric lidar by use of real day-time background parameters and features of SiPM-photodetectors studied experimentally were carried out with comparison of the extent of sensitivity decreasing for different detectors used and estimations of their operation range reduction.
- Published
- 2013
45. Atmospheric dispersion of airborne pollen evidenced by near-surface and columnar measurements in Barcelona, Spain
- Author
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Michaël Sicard, Rebeca Izquierdo, Adolfo Comerón, Concepción De Linares, Marta Alarcón, Oriol Jorba, Jordina Belmonte, José María Baldasano, Universitat Politècnica de Catalunya. Departament de Teoria del Senyal i Comunicacions, Universitat Politècnica de Catalunya. Departament de Física, Universitat Politècnica de Catalunya. Departament d'Enginyeria de Projectes i de la Construcció, Universitat Politècnica de Catalunya. RSLAB - Grup de Recerca en Teledetecció, and Universitat Politècnica de Catalunya. GReCT - Grup de Recerca de Ciències de la Terra
- Subjects
Near-surface concentration ,010504 meteorology & atmospheric sciences ,Chemical transport model ,Airborne pollen ,medicine.disease_cause ,01 natural sciences ,Atmosphere ,03 medical and health sciences ,0302 clinical medicine ,Diurnal cycle ,Pollen ,Depolarization ratio ,medicine ,Pol·len -- Disseminació -- Teledetecció ,Relative humidity ,0105 earth and related environmental sciences ,Columnar dispersion ,Lidar ,food and beverages ,Atmospheric dispersion modeling ,Pollen -- Dispersal -- Remote sensing ,Desenvolupament humà i sostenible::Enginyeria ambiental [Àrees temàtiques de la UPC] ,Plume ,Geography ,030228 respiratory system ,Enginyeria de la telecomunicació::Radiocomunicació i exploració electromagnètica::Teledetecció [Àrees temàtiques de la UPC] ,Climatology ,Local scale simulation - Abstract
Hourly measurements of pollen near-surface concentration and lidar-derived profiles of volume and particle depolarization ratios during a 5-day pollination event observed in Barcelona, Spain, between 27 – 31 March, 2015, are presented. Maximum hourly pollen concentrations of 4700 and 1200 m-3 h-1 were found for Platanus and Pinus, respectively, which represented together more than 80 % of the total pollen. . The pollen concentration was found positively correlated with temperature (correlation coefficient, r, of 0.95) and wind speed (r = 0.82) and negatively correlated with relative humidity (r = -0.18). The ground concentration shows a clear diurnal cycle although pollen activity is also detected during nighttime in three occasions and is clearly associated with periods of strong wind speeds. Everyday a clear diurnal cycle caused by the vertical transport of the airborne pollen was visible on the lidar-derived profiles of the volume depolarization ratio with maxima usually reached between 12 and 15 UT. On average the volume depolarization ratios in the pollen plume ranged between 0.08 and 0.22. Except in the cases of nocturnal pollen activity, the correlation coefficients between volume depolarization ratio and near-surface concentration are high (>0.68). The dispersion of the Platanus and Pinus in the atmosphere was simulated with the Nonhydrostatic Multiscale Meteorological Model on the B grid at the Barcelona Supercomputing Center with a newly developed Chemical Transport Model (NMMB/BSC-CTM). Model near-surface daily pollen concentrations were compared to our observations at two sites: in Barcelona and Bellaterra (12 km NE of Barcelona). Model hourly pollen concentrations were compared to our observations in Barcelona. Better results are obtained for Pinus than for Platanus. Guidelines are proposed to improve the dispersion of airborne pollen by atmospheric models.
- Published
- 2016
46. Concept design of a multiwavelength aerosol lidar system with mitigated diattenuation effects and depolarization-measurement capability
- Author
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David Garcia-Vizcaino, Michaël Sicard, Ruben Barragan, Constantino Munoz, Adolfo Comerón, Alejandro Rodríguez, Francesc Rocadenbosch, Jordi Tiana-Alsina, Eric Vidal, Universitat Politècnica de Catalunya. Departament de Teoria del Senyal i Comunicacions, Universitat Politècnica de Catalunya. Doctorat en Teoria del Senyal i Comunicacions, Universitat Politècnica de Catalunya. Departament de Física, Universitat Politècnica de Catalunya. RSLAB - Grup de Recerca en Teledetecció, and Universitat Politècnica de Catalunya. CTE-CRAE - Grup de Recerca en Ciències i Tecnologies de l'Espai
- Subjects
Materials science ,Teledetecció ,Atmospheric measuring apparatus ,QC1-999 ,02 engineering and technology ,Optical radar ,Aerosols atmosfèrics ,Dichroic glass ,01 natural sciences ,law.invention ,Optics ,law ,0103 physical sciences ,0202 electrical engineering, electronic engineering, information engineering ,Perpendicular ,Physics::Atmospheric and Oceanic Physics ,Remote sensing ,010302 applied physics ,Aerosols ,Atmospheric techniques ,business.industry ,Physics ,020208 electrical & electronic engineering ,Depolarization ,Air -- Pollution -- Meteorological aspects ,Aire -- Contaminació -- Aspectes meteorològics ,Polarization (waves) ,Atmospheric aerosols ,Radar òptic ,Aerosol ,Wavelength ,Lidar ,Enginyeria de la telecomunicació::Radiocomunicació i exploració electromagnètica::Teledetecció [Àrees temàtiques de la UPC] ,Remote sensing by laser beam ,Enginyeria agroalimentària::Ciències de la terra i de la vida [Àrees temàtiques de la UPC] ,business ,Beam splitter - Abstract
It is known that the retrieval of aerosol extinction and backscatter coefficients from lidar data acquired through so-called total-power channels – intended to measure the backscattered power irrespective of the polarization – can be adversely affected by varying depolarization effects produced by the aerosol under measurement. This effect can be particularly noticeable in advanced multiwavelength systems, where different wavelengths are separated using a system of dichroic beam splitters, because in general the reflection and transmission coefficients of the beam splitters will be different for fields with polarization parallel or perpendicular to the incidence plane. Here we propose a setup for multiwavelength aerosol lidars alleviating diattenuation effects due to changing depolarization conditions while allowing measure linear depolarization. This work has been supported by the following projects and grants: European Union 7th Framework Programme grant agreement No. 262254 (ACTRIS), Spanish Ministry for Economy and Competitiveness grants TEC2012-34575 and UNPC10-4E-442, and by the Catalan Agency for Support to Universities and Research (AGAUR) grant 2014 SGR 583.
- Published
- 2016
47. Profiling of aerosol microphysical properties at several EARLINET/AERONET sites during the July 2012 ChArMEx/EMEP campaign
- Author
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M. J. Granados-Muñoz, F. Navas-Guzmán, J. L. Guerrero-Rascado, J. A. Bravo-Aranda, I. Binietoglou, S. N. Pereira, S. Basart, J. M. Baldasano, L. Belegante, A. Chaikovsky, A. Comerón, G. D'Amico, O. Dubovik, L. Ilic, P. Kokkalis, C. Muñoz-Porcar, S. Nickovic, D. Nicolae, F. J. Olmo, A. Papayannis, G. Pappalardo, A. Rodríguez, K. Schepanski, M. Sicard, A. Vukovic, U. Wandinger, F. Dulac, L. Alados-Arboledas, Departamento de Fisica Aplicada [Granada], Universidad de Granada = University of Granada (UGR), Instituto Interuniversitario de Investigacion del Sistema Tierra en Andalucia (IISTA-CEAMA), Istituto di Metodologie per l'Analisi Ambientale (IMAA), Consiglio Nazionale delle Ricerche [Potenza] (CNR), Barcelona Supercomputing Center - Centro Nacional de Supercomputacion (BSC - CNS), Earth Sciences Department [Barcelona], National Institute of Research and Development for Optoelectronics (INOE), National Academy of Sciences of Belarus (NASB), Remote Sensing Laboratory [Barcelona] (RSLab), Universitat Politècnica de Catalunya [Barcelona] (UPC), Laboratoire d’Optique Atmosphérique - UMR 8518 (LOA), Institut national des sciences de l'Univers (INSU - CNRS)-Université de Lille-Centre National de la Recherche Scientifique (CNRS), Laser Remote Sensing Laboratory, National Technical University of Athens [Athens] (NTUA), Spanish National Research Council (CSIC), Department of Electrical Engineering [Princeton] (EE), Princeton University, School of Earth and Environment [Leeds] (SEE), University of Leeds, Leibniz Institute for Tropospheric Research (TROPOS), Laboratoire des Sciences du Climat et de l'Environnement [Gif-sur-Yvette] (LSCE), Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut national des sciences de l'Univers (INSU - CNRS)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS), Chimie Atmosphérique Expérimentale (CAE), Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut national des sciences de l'Univers (INSU - CNRS)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS)-Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut national des sciences de l'Univers (INSU - CNRS)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS), Universitat Politècnica de Catalunya. Departament d'Enginyeria de Projectes i de la Construcció, Universitat Politècnica de Catalunya. Departament de Teoria del Senyal i Comunicacions, Universitat Politècnica de Catalunya. GReCT - Grup de Recerca de Ciències de la Terra, Universitat Politècnica de Catalunya. RSLAB - Grup de Recerca en Teledetecció, Universidad de Granada (UGR), Institut national des sciences de l'Univers (INSU - CNRS)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université de Versailles Saint-Quentin-en-Yvelines (UVSQ), Institut national des sciences de l'Univers (INSU - CNRS)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Institut national des sciences de l'Univers (INSU - CNRS)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université de Versailles Saint-Quentin-en-Yvelines (UVSQ), and Barcelona Supercomputing Center
- Subjects
Air quality -- Measurement -- Mathematical models ,Atmospheric Science ,010504 meteorology & atmospheric sciences ,RAMAN LIDAR ,Aerosols atmosfèrics ,Clima—Observacions ,Atmospheric sciences ,01 natural sciences ,WESTERN MEDITERRANEAN BASIN ,lcsh:Chemistry ,Seasonal forecasting ,Volume concentration ,Aerosol types ,[SDU.OCEAN]Sciences of the Universe [physics]/Ocean, Atmosphere ,MINERAL DUST ,OPTICAL-PROPERTIES ,Atmospheric aerosols ,lcsh:QC1-999 ,3. Good health ,AERONET ,Plume ,Aire -- Qualitat -- Mesurament -- Models matemàtics ,Lidar ,Meteorology ,530 Physics ,Optical radar ,Mineral dust ,010309 optics ,SAHARAN DUST ,0103 physical sciences ,Pols ,GLOBAL SCALES ,ChArMEx database ,[SDU.ENVI]Sciences of the Universe [physics]/Continental interfaces, environment ,Aerosol ,Field campaign ,0105 earth and related environmental sciences ,Aerosols ,Radiometer ,NORTHERN AFRICA ,Lidar Radiometer Inversion Code (LIRIC) ,Enginyeria química::Química del medi ambient [Àrees temàtiques de la UPC] ,Forecasting--Data processing ,Pols mineral ,500 Science ,620 Engineering ,Mineral dusts—Measurement ,Radar òptic ,NMMB/BSC-DUST MODEL ,MIDDLE-EAST ,Desenvolupament humà i sostenible::Enginyeria ambiental [Àrees temàtiques de la UPC] ,DESERT DUST ,lcsh:QD1-999 ,ChArMEx ,Environmental science ,lcsh:Physics ,Desenvolupament humà i sostenible::Degradació ambiental::Contaminació atmosfèrica [Àrees temàtiques de la UPC] - Abstract
The simultaneous analysis of aerosol microphysical properties profiles at different European stations is made in the framework of the ChArMEx/EMEP 2012 field campaign (9-11 July 2012). During and in support of this campaign, five lidar ground-based stations (Athens, Barcelona, Bucharest, A parts per thousand vora, and Granada) performed 72aEuro-h of continuous lidar measurements and collocated and coincident sun-photometer measurements. Therefore it was possible to retrieve volume concentration profiles with the Lidar Radiometer Inversion Code (LIRIC). Results indicated the presence of a mineral dust plume affecting the western Mediterranean region (mainly the Granada station), whereas a different aerosol plume was observed over the Balkans area. LIRIC profiles showed a predominance of coarse spheroid particles above Granada, as expected for mineral dust, and an aerosol plume composed mainly of fine and coarse spherical particles above Athens and Bucharest. Due to the exceptional characteristics of the ChArMEx database, the analysis of the microphysical properties profiles' temporal evolution was also possible. An in-depth analysis was performed mainly at the Granada station because of the availability of continuous lidar measurements and frequent AERONET inversion retrievals. The analysis at Granada was of special interest since the station was affected by mineral dust during the complete analyzed period. LIRIC was found to be a very useful tool for performing continuous monitoring of mineral dust, allowing for the analysis of the dynamics of the dust event in the vertical and temporal coordinates. Results obtained here illustrate the importance of having collocated and simultaneous advanced lidar and sun-photometer measurements in order to characterize the aerosol microphysical properties in both the vertical and temporal coordinates at a regional scale. In addition, this study revealed that the use of the depolarization information as input in LIRIC in the stations of Bucharest, A parts per thousand vora, and Granada was crucial for the characterization of the aerosol types and their distribution in the vertical column, whereas in stations lacking depolarization lidar channels, ancillary information was needed. Results obtained were also used for the validation of different mineral dust models. In general, the models better forecast the vertical distribution of the mineral dust than the column-integrated mass concentration, which was underestimated in most of the cases. This work was supported by the Andalusia Regional Government through projects P12-RNM-2409 and P10-RNM-6299, by the Spanish Ministry of Economy and Competitiveness through projects TEC2012-34575, TEC2015-63832-P, CGL2013-45410-R, CGL2011-13580-E/CLI, CGL2011-16124-E, and CGL2013-46736-R; by the Spanish Ministry of Science and Innovation (project UNPC10-4E-442); the EU through the H2020 project ACTRIS2 (contract number 654109); by the University of Granada through the contract “Plan Propio. Programa 9. Convocatoria 2013”; and by the Department of Economy and Knowledge of the Catalan autonomous government (grant 2014 SGR 583). M. J. Granados-Muñoz was funded under grant AP2009-0552 from the Spanish Ministry of Education and Science. S. N. Pereira was funded under fellowship SFRH/BPD/81132/2011 and projects FCOMP-01-0124-FEDER-029212 (PTDC/GEO-MET/4222/2012 from the Portuguese Government). S. Basart and J. M. Baldasano acknowledge the CICYT project (CGL2010-19652 and CGL2013-46736) and Severo Ochoa Programme (SEV-2011-00067) of the Spanish Government. BSC-DREAM8b and NMMB/BSC-Dust simulations were performed on the Mare Nostrum supercomputer hosted by Barcelona Supercomputing Center-Centro Nacional de Supercomputación (BSC-CNS). This paper was realized also as a part of the project III43007 financed by the Ministry of Education and Science of the Republic of Serbia within the framework of integrated and interdisciplinary research for the period 2011–2015. It has also received funding from the European Union’s Seventh Framework Programme for research, technological development, and demonstration under grant agreement no. 289923 – ITaRS. The CIMEL calibration was performed at the AERONET-EUROPE calibration center, supported by ACTRIS-2 (EUH2020 grant agreement no. 654109. The authors express gratitude to the NOAA Air Resources Laboratory for the HYSPLIT transport and dispersion model; the ICARE Data and Services Center the MODIS team; and the ChArMEx project of the MISTRALS (Mediterranean Integrated Studies at Regional And Local Scales; http://www.mistrals-home.org) multidisciplinary research programme.
- Published
- 2016
- Full Text
- View/download PDF
48. Estimation of aerosol direct radiative forcing in Lecce during the 2013 ADRIMED campaign
- Author
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Pasquale Burlizzi, Adolfo Comerón, Maria-Rita Perrone, Salvatore Romano, Michaël Sicard, Ruben Barragan, Barragan, R., Romano, S., Sicard, M., Burlizzi, P., Perrone, M. -R., and Comeron, A.
- Subjects
mineral dust ,radiative flux measurement ,Longwave ,Radiative forcing ,Mineral dust ,Atmospheric sciences ,Aerosol ,Atmospheric radiative transfer codes ,Lidar ,Geography ,Radiative transfer ,Mediterranean Basin ,radiative transfer model ,Shortwave ,Aerosol direct radiative forcing - Abstract
In the framework of the ChArMEx (Chemistry-Aerosol Mediterranean Experiment, http://charmex.lsce.ipsl.fr/) initiative, a field campaign took place in the western Mediterranean Basin between 10 June and 5 July 2013 within the ADRIMED (Aerosol Direct Radiative Impact on the regional climate in the MEDiterranean region) project. The scientific objectives of ADRIMED are the characterization of the typical “Mediterranean aerosol” and its direct radiative forcing (column closure and regional scale). This work is focused on the multi-intrusion Saharan dust transport period of moderate intensity that occurred over the western and central Mediterranean Basin during the period 14 – 27 June. The dust plumes were detected by the EARLINET/ACTRIS (European Aerosol Research Lidar Network / Aerosols, Clouds, and Trace gases Research InfraStructure Network, http://www.actris.net/) lidar stations of Barcelona (16 and 17 June) and Lecce (22 June). First, two well-known and robust radiative transfer models, parametrized by lidar profiles for the aerosol vertical distribution, are validated both in the shortwave and longwave spectral range 1) at the surface with down- and up-ward flux measurements from radiometers and 2) at the top of the atmosphere with upward flux measurements from the CERES (Clouds and the Earth’s Radiant Energy System) radiometers on board the AQUA and TERRA satellites. The differences between models and their limitations are discussed. The instantaneous and clear-sky direct radiative forcing of mineral dust is then estimated using lidar data for parametrizing the particle vertical distribution at Lecce. The difference between the obtained forcings is discussed in regard to the mineralogy and vertical structure of the dust plume.
- Published
- 2015
49. Compact lidar system using laser diode, binary continuous wave power modulation, and an avalanche photodiode-based receiver controlled by a digital signal processor
- Author
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Antoni Ardanuy, Adolfo Comerón, Universitat Politècnica de Catalunya. Departament de Teoria del Senyal i Comunicacions, and Universitat Politècnica de Catalunya. RSLAB - Grup de Recerca en Teledetecció
- Subjects
Photomultiplier ,Digital signal processor ,Teledetecció ,Computer science ,02 engineering and technology ,01 natural sciences ,7. Clean energy ,Signal ,Semiconductor laser theory ,law.invention ,010309 optics ,Signal-to-noise ratio ,law ,Clouds ,0103 physical sciences ,0202 electrical engineering, electronic engineering, information engineering ,Electronic engineering ,Digital signal processing ,Pseudorandom modulation ,Lidar ,Signal processing ,Laser diode ,business.industry ,General Engineering ,020206 networking & telecommunications ,Remote sensing ,Avalanche photodiode ,Atomic and Molecular Physics, and Optics ,Enginyeria de la telecomunicació::Radiocomunicació i exploració electromagnètica::Teledetecció [Àrees temàtiques de la UPC] ,Continuous wave ,business - Abstract
We analyze the practical limits of a lidar system based on the use of a laser diode, random binary continuous wave power modulation, and an avalanche photodiode (APD)-based photereceiver, combined with the control and computing power of the digital signal processors (DSP) currently available. The target is to design a compact portable lidar system made all in semiconductor technology, with a low-power demand and an easy configuration of the system, allowing change in some of its features through software. Unlike many prior works, we emphasize the use of APDs instead of photomultiplier tubes to detect the return signal and the application of the system to measure not only hard targets, but also medium-range aerosols and clouds. We have developed an experimental prototype to evaluate the behavior of the system under different environmental conditions. Experimental results provided by the prototype are presented and discussed.
- Published
- 2018
50. Depolarization channel for barcelona lidar. Implementation and preliminary measurements
- Author
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Ruben Barragan, Michaël Sicard, Alejandro Rodríguez-Gómez, Constantino Muñoz-Porcar, Francesc Rocadenbosch, Adolfo Comerón, Eric Vidal, Universitat Politècnica de Catalunya. Departament de Teoria del Senyal i Comunicacions, and Universitat Politècnica de Catalunya. RSLAB - Grup de Recerca en Teledetecció
- Subjects
Teledetecció ,010504 meteorology & atmospheric sciences ,Physics ,QC1-999 ,Inversion (meteorology) ,Depolarization ,Remote sensing ,010502 geochemistry & geophysics ,01 natural sciences ,Intrusion ,Lidar ,Enginyeria de la telecomunicació::Radiocomunicació i exploració electromagnètica::Teledetecció [Àrees temàtiques de la UPC] ,0105 earth and related environmental sciences - Abstract
A new depolarization channel has been implemented in the BarcelonaTech University (UPC) multi-wavelength lidar system. The optical and mechanical designs are presented. The special configuration of the total power channel is also detailed, with the relevant aspects in measurement inversion. Some preliminary measurements are presented for Saharan dust intrusion events.
- Published
- 2018
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