20 results on '"Boyan Petkov"'
Search Results
2. First Retrievals of Surface and Atmospheric Properties Using EnMAP Measurements over Antarctica
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Alexander A. Kokhanovsky, Maximillian Brell, Karl Segl, Giovanni Bianchini, Christian Lanconelli, Angelo Lupi, Boyan Petkov, Ghislain Picard, Laurent Arnaud, Robert S. Stone, and Sabine Chabrillat
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snow remote sensing ,radiative transfer ,light scattering ,ice grain size ,snow albedo ,Science - Abstract
The paper presents the first retrievals of clean snow properties using spaceborne hyperspectral observations via the Environmental Mapping and Analysis Program (EnMAP). The location close to the Concordia station at the Dome C Plateau (Antarctica) was selected. At this location, the atmospheric effects (except molecular light scattering and absorption) are weak, and the simplified atmospheric correction scheme could be applied. The ice grain size, snow specific surface area, and snow spectral and broadband albedos were retrieved using single-view EnMAP measurements. In addition, we propose a technique to retrieve trace gas concentrations (e.g., water vapor and ozone) from EnMAP observations over the snow surfaces. A close correspondence of satellite and ground-measured parameters was found.
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- 2023
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3. Insights on nitrate sources at Dome C (East Antarctic Plateau) from multi-year aerosol and snow records
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Rita Traversi, Roberto Udisti, Daniele Frosini, Silvia Becagli, Virginia Ciardini, Bernd Funke, Christian Lanconelli, Boyan Petkov, Claudio Scarchilli, Mirko Severi, and Vito Vitale
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nitrate ,aerosol ,Antarctica ,Dome C ,chemical composition ,Meteorology. Climatology ,QC851-999 - Abstract
Here we present the first multi-year record of nitrate in the atmospheric aerosol (2005–2008) and surface snow (2006–08) from central Antarctica. PM10 and size-segregated aerosol, together with superficial snow, have been collected all year-round at high resolution (daily for all the snow samples and for most of aerosol samples) at Dome C since the 2004/05 field season and analysed for main and trace ionic markers. The suitability of the sampling location in terms of possible contamination from the base is shown in detail. In spite of the relevance of nitrate in Antarctic atmosphere, both for better understanding the chemistry of N cycle in the plateau boundary layer and for improving the interpretation of long-term nitrate records from deep ice core records, nitrate sources in Antarctica are not well constrained yet, neither in extent nor in timing. A recurring seasonal pattern was pointed out in both aerosol and snow records, showing summer maxima and winter minima, although aerosol maxima lead the snow ones of 1–2 months, possibly due to a higher acidity in the atmosphere in mid-summer, favouring the repartition of nitrate as nitric acid and thus its uptake by the surface snow layers. On the basis of a meteorological analysis of one major nitrate event, of data related to PSC I extent and of irradiance values, we propose that the high nitrate summer levels in aerosol and snow are likely due to a synergy of enhanced source of nitrate and/or its precursors (such as the stratospheric inputs), higher solar irradiance and higher oxidation rates in this season. Moreover, we show here a further evidence of the substantial contribution of HNO3/NOx re-emission from the snowpack, already shown in previous works, and which can explain a significant fraction of atmospheric nitrate, maintaining the same seasonal pattern in the snow. As concerning snow specifically, the presented data suggest that nitrate is likely to be controlled mainly by atmospheric processes, not on the daily timescale but rather on the seasonal one.
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- 2014
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4. First Retrievals of Surface and Atmospheric Properties Using EnMAP Measurements over Antarctica
- Author
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Chabrillat, Alexander A. Kokhanovsky, Maximillian Brell, Karl Segl, Giovanni Bianchini, Christian Lanconelli, Angelo Lupi, Boyan Petkov, Ghislain Picard, Laurent Arnaud, Robert S. Stone, and Sabine
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snow remote sensing ,radiative transfer ,light scattering ,ice grain size ,snow albedo - Abstract
The paper presents the first retrievals of clean snow properties using spaceborne hyperspectral observations via the Environmental Mapping and Analysis Program (EnMAP). The location close to the Concordia station at the Dome C Plateau (Antarctica) was selected. At this location, the atmospheric effects (except molecular light scattering and absorption) are weak, and the simplified atmospheric correction scheme could be applied. The ice grain size, snow specific surface area, and snow spectral and broadband albedos were retrieved using single-view EnMAP measurements. In addition, we propose a technique to retrieve trace gas concentrations (e.g., water vapor and ozone) from EnMAP observations over the snow surfaces. A close correspondence of satellite and ground-measured parameters was found.
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- 2023
- Full Text
- View/download PDF
5. Water Vapour Assessment Using GNSS and Radiosondes over Polar Regions and Estimation of Climatological Trends from Long-Term Time Series Analysis
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Leonardo Martelli, Vincenza Tornatore, Pierguido Sarti, Boyan Petkov, Claudio Tomasi, Stefano Barindelli, Monia Negusini, and ITA
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GNSS ,radiosonde ,ERA ,precipitable water vapour ,climate trends ,Arctic ,Antarctica ,Precipitable water ,business.industry ,Science ,Climate change ,Latitude ,law.invention ,GNSS applications ,law ,Climatology ,Global Positioning System ,Radiosonde ,General Earth and Planetary Sciences ,Environmental science ,Climate state ,business - Abstract
The atmospheric humidity in the Polar Regions is an important factor for the global budget of water vapour, which is a significant indicator of Earth’s climate state and evolution. The Global Navigation Satellite System (GNSS) can make a valuable contribution in the calculation of the amount of Precipitable Water Vapour (PW). The PW values retrieved from Global Positioning System (GPS), hereafter PWGPS, refer to 20-year observations acquired by more than 40 GNSS geodetic stations located in the polar regions. For GNSS stations co-located with radio-sounding stations (RS), which operate Vaisala radiosondes, we estimated the PW from RS observations (PWRS). The PW values from the ERA-Interim global atmospheric reanalysis were used for validation and comparison of the results for all the selected GPS and RS stations. The correlation coefficients between times series are very high: 0.96 for RS and GPS, 0.98 for RS and ERA in the Arctic; 0.89 for RS and GPS, 0.97 for RS and ERA in Antarctica. The Root-Mean-Square of the Error (RMSE) is 0.9 mm on average for both RS vs. GPS and RS vs. ERA in the Arctic, and 0.6 mm for RS vs. GPS and 0.4 mm for RS vs. ERA in Antarctica. After validation, long-term trends, both for Arctic and Antarctic regions, were estimated using Hector scientific software. Positive PWGPS trends dominate at Arctic sites near the borders of the Atlantic Ocean. Sites located at higher latitudes show no significant values (at 1σ level). Negative PWGPS trends were observed in the Arctic region of Greenland and North America. A similar behaviour was found in the Arctic for PWRS trends. The stations in the West Antarctic sector show a general positive PWGPS trend, while the sites on the coastal area of East Antarctica exhibit some significant negative PWGPS trends, but in most cases, no significant PWRS trends were found. The present work confirms that GPS is able to provide reliable estimates of water vapour content in Arctic and Antarctic regions too, where data are sparse and not easy to collect. These preliminary results can give a valid contribution to climate change studies.
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- 2021
6. The 2020 Arctic ozone depletion and signs of its effect on the ozone column at lower latitudes
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Daniele Mastrangelo, Henri Diémoz, Piero Di Carlo, Giuseppe Casale, Anna Maria Siani, Vito Vitale, Mauro Mazzola, Oxana Drofa, Ilias Fountoulakis, Angelo Lupi, and Boyan Petkov
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Ozone ,Arctic ozone ,Solar ultraviolet irradiance ,Anomaly (natural sciences) ,Irradiance ,Atmospheric sciences ,Ozone depletion ,Latitude ,Polar vortex ,Relationships between polar and mid-latitudes ,chemistry.chemical_compound ,Polar circle ,chemistry ,Arctic ,General Earth and Planetary Sciences ,Environmental science ,General Environmental Science ,Ozone column ,Research Article - Abstract
The present study discusses the effect of the ozone depletion that occurred over the Arctic in 2020 on the ozone column in central and southern Europe by analysing a data set obtained from ground-based measurements at six stations placed from 79 to 42°N. Over the northernmost site (Ny-Alesund), the ozone column decreased by about 45% compared to the climatological average at the beginning of April, and its values returned to the normal levels at the end of the month. Southwards, the anomaly gradually reduced to nearly 15% at 42°N (Rome) and the ozone minimum was detected with a delay from about 6 days at 65°N to 20 days at 42°N. At the same time, the evolution of the ozone column at the considered stations placed below the polar circle corresponded to that observed at Ny-Alesund, but at 42°–46°N, the ozone column turned back to the typical values at the end of May. This similarity in the ozone evolutional patterns at different latitudes and the gradually increasing delay of the minimum occurrences towards the south allows the assumption that the ozone columns at lower latitudes were affected by the phenomenon in the Arctic. The ozone decrease observed at Aosta (46°N) combined with predominantly cloud-free conditions resulted in about an 18% increase in the erythemally weighted solar ultraviolet irradiance reaching the Earth’s surface in May.
- Published
- 2021
7. Analysis of multi-year near-surface ozone observations at the WMO/GAW 'Concordia' station (75°06′S, 123°20′E, 3280m a.s.l. – Antarctica)
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Paolo, Cristofanelli, Davide, Putero, Paolo, Bonasoni, Maurizio, Busetto, Francescopiero, Calzolari, Giuseppe, Camporeale, Paolo, Grigioni, Angelo, Lupi, Boyan, Petkov, Traversi, Rita, Udisti, Roberto, and Vito, Vitale
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Near-surface O3, Antarctica, STT, Photochemistry - Published
- 2018
8. Analysis of multi-year near-surface ozone observations at the WMO/GAW 'Concordia' station (75°06″S, 123°20″E, 3280 m a.s.l. – Antarctica)
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Davide Putero, Paolo Cristofanelli, Angelo Lupi, Boyan Petkov, Maurizio Busetto, Vito Vitale, Paolo Grigioni, Rita Traversi, Giuseppe Camporeale, Paolo Bonasoni, Francescopiero Calzolari, Roberto Udisti, Grigioni, P., and Camporeale, G.
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Atmospheric Science ,010504 meteorology & atmospheric sciences ,Photochemistry ,Irradiance ,010501 environmental sciences ,Atmospheric sciences ,01 natural sciences ,STT ,Near-surface O3 ,Antarctica ,Intrusion ,symbols.namesake ,Surface ozone ,symbols ,Environmental science ,Lagrangian ,0105 earth and related environmental sciences ,General Environmental Science ,Antarctic plateau - Abstract
This work focuses on the near-surface O3 variability over the eastern Antarctic Plateau. In particular, eight years (2006–2013) of continuous observations at the WMO/GAW contributing station “Concordia” (Dome C–DMC: 75°06′S, 123°20′E, 3280 m) are presented, in the framework of the Italian Antarctic Research Programme (PNRA). First, the characterization of seasonal and diurnal O3 variability at DMC is provided. Then, for the period of highest data coverage (2008–2013), we investigated the role of specific atmospheric processes in affecting near-surface summer O3 variability, when O3 enhancement events (OEEs) are systematically observed at DMC (average monthly frequency peaking up to 60% in December). As deduced by a statistical selection methodology, these OEEs are affected by a significant interannual variability, both in their average O3 values and in their frequency. To explain part of this variability, we analyzed OEEs as a function of specific atmospheric variables and processes: (i) total column of O3 (TCO) and UV-A irradiance, (ii) long-range transport of air masses over the Antarctic Plateau (by Lagrangian back-trajectory analysis – LAGRANTO), (iii) occurrence of “deep” stratospheric intrusion events (by using the Lagrangian tool STLEFLUX). The overall near-surface O3 variability at DMC is controlled by a day-to-day pattern, which strongly points towards a dominating influence of processes occurring at “synoptic” scales rather than “local” processes. Even if previous studies suggested an inverse relationship between OEEs and TCO, we found a slight tendency for the annual frequency of OEEs to be higher when TCO values are higher over DMC. The annual occurrence of OEEs at DMC seems related to the total time spent by air masses over the Antarctic plateau before their arrival to DMC, suggesting the accumulation of photochemically-produced O3 during the transport, rather than a more efficient local production. Moreover, the identification of recent (i.e., 4-day old) stratospheric intrusion events by STEFLUX suggested only a minor influence (up to 3% of the period, in November) of “deep” events on the variability of near-surface summer O3 at DMC. © 2018 The Authors
- Published
- 2018
9. Altitude-temporal behaviour of atmospheric ozone, temperature and wind velocity observed at Svalbard
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Angelo Lupi, Anna Solomatnikova, Angelo Viola, Georg Hansen, Josef Elster, Tove Marit Svendby, Kseniya Pavlova, Vito Vitale, Kamil Láska, Mauro Mazzola, Boyan Petkov, and Piotr Sobolewski
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Ozone response to solar eclipse ,Atmospheric Science ,Ozone ,010504 meteorology & atmospheric sciences ,Atmospheric ozone ,010502 geochemistry & geophysics ,Atmospheric sciences ,Ozone depletion ,01 natural sciences ,Wind speed ,Atmosphere ,Troposphere ,chemistry.chemical_compound ,Altitude ,Arctic ,chemistry ,13. Climate action ,Arctic atmosphere ,Environmental science ,Variations in atmospheric parameters ,Tropopause ,0105 earth and related environmental sciences ,Temperature, ozone, and wind profiles - Abstract
The vertical features of the variations in the atmospheric ozone density, temperature and wind velocity observed at Ny-Alesund, Svalbard were studied by applying the principal component analysis to the ozonesounding data collected during the 1992–2016 period. Two data sets corresponding to intra-seasonal (IS) variations, which are composed by harmonics with lower than 1 year periods and inter-annual (IA) variations, characterised by larger periods, were extracted and analysed separately. The IS variations in all the three parameters were found to be composed mainly by harmonics typical for the Madden-Julian Oscillation (from 30- to 60-day periods) and, while the first four principal components (PCs) associated with the temperature and wind contributed about 90% to the IS variations, the ozone IS oscillations appeared to be a higher dimensional object for which the first 15 PCs presented almost the same extent of contribution. The IA variations in the three parameters were consisted of harmonics that correspond to widely registered over the globe Quasi-Biennial, El Nino-Southern, North Atlantic and Arctic Oscillations respectively, and the IA variations turned out to be negligible below the tropopause that characterises the Svalbard troposphere as comparatively closed system with respect to the long-period global variations. The behaviour of the first and second PCs associated with IS ozone variations in the time of particular events, like the strong ozone depletion over Arctic in the spring 2011 and solar eclipses was discussed and the changes in the amplitude-frequency features of these PCs were assumed as signs of the atmosphere response to the considered phenomena.
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- 2018
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10. Investigation of surface ozone variability over the Antractic Plateau by observations at the' Concordia' WMO/GAW contributing station
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Paolo Cristofanelli, Roberto Udisti, Maurizio Busetto, Francescopiero Calzolari, Davide Putero, Angelo Lupi, Mauro Mazzola, Boyan Petkov, and Paolo Bonasoni
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ozone ,antarctica - Published
- 2017
11. UV index monitoring in Europe
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P. Kolarž, Henner Sandmann, David Bolsée, Julia Bilbao, José Manuel Vilaplana Guerrero, Alexandr Aculinin, Janusz W. Krzyscin, Sandra Andersson, Bjørn Helge Johnsen, Natalia Chubarova, Tilman Weiss, Daniele Grifoni, Rolf Werner, D. Groselj, Peter den Outer, Giuseppe Lorenzetto, Margit Aun, Nis Jepsen, Juan Ramon Moreta Gonzales, Francis Massen, Thierry Duprat, Jacqueline O'Hagan, Julita Biszczuk-Jakubowska, G. Zipoli, Tove Marit Svendby, Anu Heikkilä, Barbara Klotz, Alkis Bais, Julian Gröbner, Anna Maria Siani, Mario Blumthaler, Davor Tomsic, P. Eriksen, Henri Diémoz, Ann R. Webb, Diamantino Henriques, Alcide di Sarra, Antonio Serrano, Luisa Vaccaro, Boyan Petkov, Laurent Vuilleumier, Zoltan Toth, Anna Pribullova, Zoran Mijatovic, Hugo De Backer, Alois W. Schmalwieser, Charles Yousif, Ladislav Metelka, and Arne Dahlback
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Index (economics) ,010504 meteorology & atmospheric sciences ,solar UV radiation ,Sun protection ,business.industry ,Environmental resource management ,Quality control ,European population ,010501 environmental sciences ,UV index ,dissemination ,Europe ,01 natural sciences ,3. Good health ,Health care ,The Internet ,Physical and Theoretical Chemistry ,business ,Quality assurance ,Quality information ,0105 earth and related environmental sciences - Abstract
The UV Index was established more than 20 years ago as a tool for sun protection and health care. Shortly after its introduction, UV Index monitoring started in several countries either by newly acquired instruments or by converting measurements from existing instruments into the UV Index. The number of stations and networks has increased over the years. Currently, 160 stations in 25 European countries deliver online values to the public via the Internet. In this paper an overview of these UV Index monitoring sites in Europe is given. The overview includes instruments as well as quality assurance and quality control procedures. Furthermore, some examples are given about how UV Index values are presented to the public. Through these efforts, 57% of the European population is supplied with high quality information, enabling them to adapt behaviour. Although health care, including skin cancer prevention, is cost-effective, a proportion of the European population still doesn't have access to UV Index information.
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- 2017
12. Multi-seasonal ultrafine aerosol particle number concentration measurements at the Gruvebadet observatory, Ny-lesund, Svalbard Islands
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Fabio Giardi, Mauro Mazzola, Maurizio Busetto, Johan Ström, Angelo Lupi, Hans-Christen Hansson, Roberto Udisti, Tabea Henning, Boyan Petkov, Radovan Krejci, Angelo Viola, Silvia Becagli, Peter Tunved, Christian Lanconelli, and Vito Vitale
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Arctic haze ,Range (particle radiation) ,010504 meteorology & atmospheric sciences ,Particle number ,Ultrafine aerosol concentration ,Lognormal fitting procedure ,010501 environmental sciences ,Atmospheric sciences ,01 natural sciences ,Modal Number ,Aerosol ,Arctic aerosol ,Observatory ,Climatology ,Particle-size distribution ,General Earth and Planetary Sciences ,Particle ,Environmental science ,Aerosol size distribution ,General Agricultural and Biological Sciences ,0105 earth and related environmental sciences ,General Environmental Science - Abstract
The object of this study was to investigate the different modal behavior of ultrafine aerosol particles collected at the Gruvebadet observatory located in Ny-lesund (Svalbard Islands, 78A degrees 55'N, 11A degrees 56'E). Aerosol particle size distribution was measured in the size range from 10 to 470 nm typically from the beginning of spring to the beginning of fall during four (non-consecutive) years (2010, 2011, 2013 and 2014). The median concentration for the whole period taken into account was 214 particles cm(-3), oscillating between the median maximum in July with a concentration of 257 particles cm(-3) and a median minimum in April with 197 particles cm(-3). The median total number concentration did not present a well-defined seasonal behavior, as shown by contrast looking at the sub/modal number concentration, where distinct trends appeared in the predominant accumulation concentration recorded during April/May and the preponderant concentration of Aitken particles during the summer months. Lastly, the short side-by-side spring 2013 campaign performed at the Zeppelin observatory with a differential mobility particle sizer was characterized by an aerosol concentration mean steady difference between the two instruments of around 14 %, thereby supporting the reliability of the device located at Gruvebadet.
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- 2016
13. Variability features associated with ozone column and surface UV irradiance observed over Svalbard from 2008 to 2014
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Christian Lanconelli, Boyan Petkov, Angelo Viola, Vito Vitale, Angelo Lupi, Mauro Mazzola, and Maurizio Busetto
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0301 basic medicine ,Ozone column in Arctic ,Radiometer ,Ozone ,Irradiance ,Perturbation (astronomy) ,Solar irradiance ,Atmospheric sciences ,01 natural sciences ,Ozone depletion ,UV radiation ,Arctic ozone depletion ,03 medical and health sciences ,chemistry.chemical_compound ,Geography ,Arctic ,chemistry ,Climatology ,0103 physical sciences ,General Earth and Planetary Sciences ,Polar ,030101 anatomy & morphology ,General Agricultural and Biological Sciences ,010303 astronomy & astrophysics ,General Environmental Science - Abstract
The present report shortly summarises the conclusions about the ozone column and solar UV irradiance variability that were achieved through the analysis of the data obtained from the narrow-band filter radiometer UV-RAD, operating at Ny-Alesund from 2008 to 2014. The polar summer gives the opportunity to register the solar irradiance 24 h per day during several months that provides comparatively long continuous time series as regards for the short- (diurnal) and medium-term (monthly) variations. To exclude the hypothesis about the artificial nature of the large amplitudes registered in the short-term ozone column variations, which can be due to the measurement or methodological errors, they were related to the corresponding variations in the solar UV radiation. In addition, these oscillations were studied using the methods developed for the analysis of non-linear dynamical systems that revealed a complex chaotic interaction between the ozone column and five other atmospheric factors. This approach leads to the conclusion that the short-term variations can be predicted for 10–20 h if a long history is available. The effect of a sporadic phenomenon, such as the ozone depletion event, occurred over Arctic in the spring of 2011, which can be considered an impulse perturbation of the medium-term ozone variations, on the mid-latitude ozone column and surface solar UV irradiance has been studied by analysing the data collected from six surface stations.
- Published
- 2016
14. First national intercomparison of solar ultraviolet radiometers in Italy
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Boyan Petkov, L. Verdi, G. Zipoli, Henri Diémoz, Giuseppe Casale, S. Facta, Anna Maria Siani, F. Fedele, A. Bonino, Daniele Grifoni, B. Serpillo, A. di Sarra, and S. Scaglione
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Atmospheric Science ,Radiometer ,Meteorology ,lcsh:TA715-787 ,lcsh:Earthwork. Foundations ,Irradiance ,medicine.disease_cause ,law.invention ,lcsh:Environmental engineering ,Atmospheric radiative transfer codes ,Spectroradiometer ,law ,Broadband ,medicine ,Calibration ,Environmental science ,lcsh:TA170-171 ,Ultraviolet ,Monochromator ,Remote sensing - Abstract
A blind intercomparison of ground-based ultraviolet (UV) instruments has been organized for the first time in Italy. The campaign was coordinated by the Environmental Protection Agency of Aosta Valley (ARPA Valle d'Aosta) and took place in Saint-Christophe (45.8° N, 7.4° E, 570 m a.s.l.), in the Alpine region, from 8 to 23 June 2010. It involved 8 institutions, 10 broadband radiometers, 2 filter radiometers and 2 spectroradiometers. Synchronized measurements of downward global solar UV irradiance at the ground were collected and the raw series were then individually processed by the respective operators on the base of their own procedures and calibration data. A radiative transfer model was successfully applied as an interpretative tool. The input parameters and output results are described in detail. The comparison was performed in terms of global solar UV Index and integrated UV-A irradiance against a well-calibrated double monochromator spectroradiometer as reference. An improved algorithm for comparing broadband data and spectra has been developed and is discussed in detail. For some instruments, we found average deviations ranging from −16 % up to 20 % relative to the reference and diurnal variations as large as 15 % even in clear days. Remarkable deviations were found for the instruments calibrated in the manufacturers' facilities and never involved in field intercomparison. Finally, some recommendations to the UV operators based on the campaign results are proposed.
- Published
- 2011
15. The New ISAC-MPP Automatized Spectroradiometer
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Ubaldo Bonafé, Christian Lanconelli, Angelo Lupi, Mauro Mazzola, Boyan Petkov, Vito Vitale, and Fabrizio Zardi
- Published
- 2014
16. Response of the ozone column over Europe to the 2011 Arctic ozone depletion event according to ground-based observations and assessment of the consequent variations in surface UV irradiance
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Weine Josefsson, Karel Vaníček, Giuseppe Casale, Angelo Lupi, Florence Goutail, Juan Ramón Moreta González, Andrew R. D. Smedley, Mauro Mazzola, Maurizio Busetto, Ulf Köhler, Oliver Mišaga, René Stübi, Boyan Petkov, Henri Diémoz, Christian Lanconelli, Ann R. Webb, Zoltan Toth, Bogdana Mendeva, Anna Maria Siani, Gunther Seckmeyer, David J. Moore, Arne Dahlback, Claudio Tomasi, R. Werner, Hugo De Backer, Vito Vitale, María López Bartolomé, Saji Varghese, Abdus Salam International Centre for Theoretical Physics [Trieste] (ICTP), CNR Institute of Atmospheric Sciences and Climate (ISAC), National Research Council of Italy | Consiglio Nazionale delle Ricerche (CNR), Dipartimento di Fisica [Roma La Sapienza], Università degli Studi di Roma 'La Sapienza' = Sapienza University [Rome] (UNIROMA), Institut für Meteorologie und Klimatologie [Hannover] (IMUK), Leibniz Universität Hannover=Leibniz University Hannover, School of Earth, Atmospheric and Environmental Sciences [Manchester] (SEAES), University of Manchester [Manchester], Space Research and Technology Institute [Sofia], Bulgarian Academy of Sciences (BAS), STRATO - 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), Meteorologisches Observatorium Hohenpeißenberg (MOHp), Deutscher Wetterdienst [Offenbach] (DWD), Swedish Meteorological and Hydrological Institute (SMHI), United Kingdom Met Office [Exeter], Agencia Estatal de Meteorología (AEMet), Slovak Hydrometeorological Institute (SHMU), University of Oslo (UiO), Hungarian Meteorological Service (OMSZ), Valentia Geophysical and Meteorological Observatory, Irish Meteorological Service, Institut Royal Météorologique de Belgique [Bruxelles] - Royal Meteorological Institute (IRM), Federal Office of Meteorology and Climatology MeteoSwiss, Solar and Ozone Observatory (SOO), Czech Hydrometeorological Institute (CHMI), Consiglio Nazionale delle Ricerche (CNR), Università degli Studi di Roma 'La Sapienza' = Sapienza University [Rome], Leibniz Universität Hannover [Hannover] (LUH), Hungarian Meteorological Service (OMSz), and Institut Royal Météorologique de Belgique [Bruxelles] (IRM)
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[PHYS.PHYS.PHYS-AO-PH]Physics [physics]/Physics [physics]/Atmospheric and Oceanic Physics [physics.ao-ph] ,Atmospheric Science ,Arctic ozone ,Ozone impact on surface UV ,Irradiance ,Ozone impact on surface ,Atmospheric sciences ,Ozone depletion ,Latitude ,Arctic ,13. Climate action ,Climatology ,Solar UV irradiance ,Environmental science ,General Environmental Science ,Ozone column - Abstract
International audience; The strong ozone depletion event that occurred in Arctic during spring 2011 was found to cause appreciable reduction in the ozone column (OC) in Europe, even at lower latitudes. The features of this episode have been analysed using the data recorded at 34 ground-based stations located in the European area and compared with the similar events in 2000 and 2005. The results provided evidence that OC as far south as 40°N latitude was considerably influenced by the Arctic ozone loss in spring 2011. The reduction of OC at the northernmost sites was about 40% with respect to the mean value calculated over the previous six-year period, while a similar decrease at the southern extreme ranged between 15 and 18%, and were delayed by nearly two weeks compared to the Arctic region. The ozone distributions reconstructed for the West Europe sector show that the decline of OC lasted from late March to late April 2011. The echo of the Arctic ozone depletion on mid-latitude UV irradiance has been analysed trough model computations that show an increase of the midday erythemal dose by 3-4 SED (1 SED = 100 J m-2) that was slightly higher than at polar regions. On the other hand it was assessed that the biosystems in the northernmost regions were a subject of about 4 times higher UV stress than those at mid-latitudes. Despite indications of an OC recovery, the event examined here shows that the issue of ozone depletion episodes cannot be belittled.
- Published
- 2014
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17. Variations in solar UV irradiance and ozone column at Concordia and Mendel Antarctic stations
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Boyan Petkov 1, Vito Vitale 1, Kamil Láska 2, Christian Lanconelli 1, Angelo Lupi 1, Mauro Mazzola 1, and Marie Budíková 3
- Published
- 2014
18. Short-term variations in the ozone column over Ny-Ålesund
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Boyan Petkov (1), Vito Vitale (1), Mauro Mazzola (1), Kerstin Stebel (2), Christian Lanconelli (1), Angelo Lupi (1), and Angelo Viola (1)
- Published
- 2013
19. Short-term variations in surface UV-B irradiance and total ozone column at Ny-Alesund during the QAARC campaign
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Veronica Gallo, Gregor Hülsen, Vigdis Lonar Barth, Mauro Mazzola, Maurizio Busetto, Julian Gröbner, Vito Vitale, Boyan Petkov, Sara De Simone, Claudio Tomasi, and Christian Lanconelli
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Atmospheric Science ,Spectroradiometer ,Arctic ,Climatology ,Linear regression ,Irradiance ,Environmental science ,Radiation ,Amplification factor ,Column (data store) ,Term (time) - Abstract
Diurnal variations in total ozone column were observed to exceed 40 DU during the QAARC campaign of late spring 2009 held at the Ny-Alesund Arctic station in Svalbard. They were correlated to corresponding oscillations of surface UV-B irradiance, assuming that the strong dependence between these two variables ensures the reliability of registered total ozone oscillations. To make the comparison, an approach is proposed that allows the retrieval of diurnal variability in UV-B irradiance due to total ozone column changes, for application to the data collected during the campaign. The UV irradiance features observed with the reference spectroradiometer over a 7-day period were analyzed together with the corresponding ozone column data-sets, simultaneously obtained using two different devices. Power curves were found to provide the best-fit solutions for the retrieved UV-B variations, examined as a function of total ozone variations. Such approximations are characterized by regression coefficients of about − 0.94 and by the exponent named in earlier studies as the radiation amplification factor (RAF), which was found to vary between 0.79 and 2.49. These RAF evaluations are in good agreement with previous estimates derived from both field measurements and model evaluations, which confirm the complete dependability of the short-term variations in the ozone column measured at Ny-Alesund.
- Published
- 2012
20. Variations of UV irradiance at Antarctic station Concordia during the springs of 2008 and 2009
- Author
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Christian Lanconelli, Mauro Mazzola, Maurizio Busetto, Claudio Tomasi, Florence Goutail, Angelo Lupi, Boyan Petkov, Andrea Pazmino, L. Genoni, Riccardo Schioppo, Vito Vitale, CNR Institute of Atmospheric Sciences and Climate (ISAC), Consiglio Nazionale delle Ricerche (CNR), Abdus Salam International Centre for Theoretical Physics [Trieste] (ICTP), STRATO - 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), Agenzia Nazionale per le nuove Tecnologie, l’energia e lo sviluppo economico sostenibile (ENEA), Department of Geological, Environmental and Marine Sciences [Trieste], Università degli studi di Trieste, National Research Council of Italy | Consiglio Nazionale delle Ricerche (CNR), Agenzia Nazionale per le nuove Tecnologie, l’energia e lo sviluppo economico sostenibile = Italian National Agency for New Technologies, Energy and Sustainable Economic Development (ENEA), and Università degli studi di Trieste = University of Trieste
- Subjects
Ozone ,010504 meteorology & atmospheric sciences ,Meteorology ,UV models ,Irradiance ,Radiation amplification factor ,Oceanography ,Solar irradiance ,Atmospheric sciences ,Ozone depletion ,01 natural sciences ,010309 optics ,chemistry.chemical_compound ,Solar UV irradiance ,0103 physical sciences ,Ecology, Evolution, Behavior and Systematics ,Zenith ,0105 earth and related environmental sciences ,[PHYS.PHYS.PHYS-AO-PH]Physics [physics]/Physics [physics]/Atmospheric and Oceanic Physics [physics.ao-ph] ,Geology ,chemistry ,13. Climate action ,Middle latitudes ,Infrared window ,Environmental science ,Ultraviolet index ,UV index - Abstract
The features of solar UV irradiance measured at the Italian-French Antarctic Plateau station, Concordia, during the springs of 2008 and 2009 are presented and discussed. In order to study the impact of the large springtime variations in total ozone column on the fraction of ultraviolet B (UV-B) irradiance (fromc.290–315 nm) reaching the Earth surface, irradiance datasets corresponding to fixed solar zenith angles (SZAs = 65°, 75° and 85°) are correlated to the daily ozone column provided by different instruments. For these SZAs the radiation amplification factor varied from 1.58–1.94 at 306 nm and from 0.68–0.88 at 314 nm. The ultraviolet index reached a maximum level of 8 in the summer, corresponding to the typical average summer value for mid latitude sites. The solar irradiance pertaining to the ultraviolet A (UV-A, 315–400 nm) spectral band was found to depend closely on variations of atmospheric transmittance characteristics as reported by previous studies. Model simulations of UV-B irradiance showed a good agreement with field measurements at 65° and 75° SZAs. For SZA = 85° the ozone vertical distribution significantly impacted model estimations. Sensitivity analysis performed by hypothetically varying the ozone distribution revealed some features of the ozone profiles that occurred in the period studied here.
- Published
- 2011
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