212 results on '"Mellqvist, J"'
Search Results
2. Monitoring of ship emissions to enforce environmental regulations. The SCIPPER project
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Mamarikas, S., Matthias, V., Karl, M., Simonen, P., Keskinen, J., Fridell, E., Winnes, H., Moldanova, J., Hallquist, Å., Mellqvist, J., Conde, V., Verbeek, R., Duyzer, J., Timonen, H., Jalkanen, J.-P., Sundström, A.-M., Stylogiannis, A., Ntziachristos, V., Smyth, T., Yang, M., Deakin, A., Proud, R., Oeffner, J., Schneider, V.E., Beecken, J., Weigelt, A., Oppo, S., Armengaud, A., D'Anna, B., T
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- 2022
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3. Individual Reports from TOPAS Contributors
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Colin, R., Carleer, M., Guilmot, J. M., Simon, P. C., Vandaele, A. C., Hermans, C., Dufour, P., Fayt, C., Galle, Bo, Axelsson, H., Bergqvist, B., Eilard, A., Mellqvist, J., Zetterberg, L., Smith, Nicola, Coe, Hugh, Allan, Beverley, Plane, John, Stutz, J., Platt, U., Pommereau, Jean-Pierre, Goutail, Florence, Laville, Patricia, Nunes-Pinharanda, Manuel, Borrell, Peter, editor, Borrell, Patricia M., editor, Cvitaš, Tomislav, editor, Kelly, Kerry, editor, Seiler, Wolfgang, editor, Bösenberg, Jens, editor, Brassington, David J., editor, and Simon, Paul C., editor
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- 1997
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4. PIR – patientsäkerhet i realtid – lämpade sig väl under pandemin
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Fröding, Elin, Edvinsson, J., Mellqvist, J., Ros, A., Fröding, Elin, Edvinsson, J., Mellqvist, J., and Ros, A.
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The adaptation of the healthcare needed in the covid-19 pandemic poses challenges to patient safety. Proactive patient safety work must continue even under conditions such as a pandemic. Methods are needed that assess and support patient safety as the work is carried out. Patient safety in real time appears to be such a useful method in which patient record review to identify patient harm is combined with interviews with patients and healthcare staff. The method was used in wards and intensive care units (ICU) for covid-19 patients in Region Jönköping County. Patient harm was found in ICU care. Patients were overall satisfied with the care, and in the interviews with healthcare staff areas for improvement were identified. Valid indicators for patient record review to evaluate patient harm in covid-19 need to be developed. To judge if patient harm in care of a Covid-19 is avoidable or not is difficult since the level of knowledge and treatment principles in the disease develops very fast.
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- 2020
5. Ground Based FTIR Measurements of Stratospheric Species from Harestua, Norway During Sesame and Comparison with Models
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Galle, B., Mellqvist, J., Arlander, D.W., Fløisand, I., Chipperfield, M.P., and Lee, A.M.
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- 1999
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6. Evaluations of NOx and highly reactive VOC emission inventories in Texas and their implications for ozone plume simulations during the Texas Air Quality Study 2006
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Kim, S.-W., McKeen, S.A., Frost, G.J., Lee, S.-H., Trainer, M., Richter, A., Angevine, W. M., Atlas, E., Bianco, L., Boersma, K.F., Brioude, J., Burrow, J.P., Gouw, de, J., Fried, A., Gleason, J.F., Hilboll, A., Mellqvist, J., Peischl, J., Richter, D., Rivera, C., Ryerson, T., Lintel Hekkert, te, L., Walega, J., Warneke, C., Weibring, P., Williams, E., and Fluids and Flows
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lcsh:Chemistry ,lcsh:QD1-999 ,SDG 14 - Life Below Water ,SDG 11 - Sustainable Cities and Communities ,lcsh:Physics ,lcsh:QC1-999 - Abstract
Satellite and aircraft observations made during the 2006 Texas Air Quality Study (TexAQS) detected strong urban, industrial and power plant plumes in Texas. We simulated these plumes using the Weather Research and Forecasting-Chemistry (WRF-Chem) model with input from the US EPA's 2005 National Emission Inventory (NEI-2005), in order to evaluate emissions of nitrogen oxides (NOx = NO + NO2) and volatile organic compounds (VOCs) in the cities of Houston and Dallas-Fort Worth. We compared the model results with satellite retrievals of tropospheric nitrogen dioxide (NO2) columns and airborne in-situ observations of several trace gases including NOx and a number of VOCs. The model and satellite NO2 columns agree well for regions with large power plants and for urban areas that are dominated by mobile sources, such as Dallas. However, in Houston, where significant mobile, industrial, and in-port marine vessel sources contribute to NOx emissions, the model NO2 columns are approximately 50%–70% higher than the satellite columns. Similar conclusions are drawn from comparisons of the model results with the TexAQS 2006 aircraft observations in Dallas and Houston. For Dallas plumes, the model-simulated NO2 showed good agreement with the aircraft observations. In contrast, the model-simulated NO2 is ~60% higher than the aircraft observations in the Houston plumes. Further analysis indicates that the NEI-2005 NOx emissions over the Houston Ship Channel area are overestimated while the urban Houston NOx emissions are reasonably represented. The comparisons of model and aircraft observations confirm that highly reactive VOC emissions originating from industrial sources in Houston are underestimated in NEI-2005. The update of VOC emissions based on Solar Occultation Flux measurements during the field campaign leads to improved model simulations of ethylene, propylene, and formaldehyde. Reducing NOx emissions in the Houston Ship Channel and increasing highly reactive VOC emissions from the point sources in Houston improve the model's capability of simulating ozone (O3) plumes observed by the NOAA WP-3D aircraft, although the deficiencies in the model O3 simulations indicate that many challenges remain for a full understanding of the O3 formation mechanisms in Houston.
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- 2011
7. Field test of available methods to measure remotely SOx and NOx emissions from ships
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Balzani Lööv, J. M., Alfoldy, B., Gast, L. F. L., Hjorth, J., Lagler, F., Mellqvist, J., Beecken, J., Berg, N., Duyzer, J., Westrate, H., Swart, D. P. J., Berkhout, A. J. C., Jalkanen, J.-P., Prata, A. J., Hoff, G. R., and Borowiak, A.
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Atmospheric pollution ,lcsh:TA715-787 ,Earth & Environment ,lcsh:Earthwork. Foundations ,lcsh:Environmental engineering ,Emission ,Exhaust emission ,Urban Development ,UES - Urban Environment & Safety ,Rotterdam ,ELSS - Earth, Life and Social Sciences ,lcsh:TA170-171 ,South Holland ,Built Environment ,Nitrogen oxides ,Netherlands - Abstract
Methods for the determination of ship fuel sulphur content and NOx emission factors based on remote measurements have been compared in the harbour of Rotterdam and compared to direct stack emission measurements on the ferry Stena Hollandica. The methods were selected based on a review of the available literature on ship emission measurements. They were either optical (LIDAR, Differential Optical Absorption Spectroscopy (DOAS), UV camera), combined with model-based estimates of fuel consumption, or based on the so called "sniffer" principle, where SO2 or NOx emission factors are determined from simultaneous measurement of the increase of CO2 and SO2 or NOx concentrations in the plume of the ship compared to the background. The measurements were performed from stations at land, from a boat and from a helicopter. Mobile measurement platforms were found to have important advantages compared to the land-based ones because they allow optimizing the sampling conditions and sampling from ships on the open sea. Although optical methods can provide reliable results it was found that at the state of the art level, the "sniffer" approach is the most convenient technique for determining both SO2 and NOx emission factors remotely. The average random error on the determination of SO2 emission factors comparing two identical instrumental set-ups was 6%. However, it was found that apparently minor differences in the instrumental characteristics, such as response time, could cause significant differences between the emission factors determined. Direct stack measurements showed that about 14% of the fuel sulphur content was not emitted as SO2. This was supported by the remote measurements and is in agreement with the results of other field studies.
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- 2014
8. Trends of ozone total columns and vertical distribution from FTIR observations at eight NDACC stations around the globe
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Vigouroux, C, Blumenstock, Thomas, Coffey, M T, Errera, Q, Garcia, Omar E, Jones, Nicholas B, Hannigan, J W, Hase, Frank, Liley, B, Mahieu, Emmanuel, Mellqvist, J, Notholt, Justus, Palm, M, Persson, G, Schneider, Matthias, Servais, C, Smale, D, Tholix, L, De Maziere, M, Vigouroux, C, Blumenstock, Thomas, Coffey, M T, Errera, Q, Garcia, Omar E, Jones, Nicholas B, Hannigan, J W, Hase, Frank, Liley, B, Mahieu, Emmanuel, Mellqvist, J, Notholt, Justus, Palm, M, Persson, G, Schneider, Matthias, Servais, C, Smale, D, Tholix, L, and De Maziere, M
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Ground-based Fourier transform infrared (FTIR) measurements of solar absorption spectra can provide ozone total columns with a precision of 2% but also independent partial column amounts in about four vertical layers, one in the troposphere and three in the stratosphere up to about 45km, with a precision of 5-6%. We use eight of the Network for the Detection of Atmospheric Composition Change (NDACC) stations having a long-term time series of FTIR ozone measurements to study the total and vertical ozone trends and variability, namely, Ny-Ålesund (79° N), Thule (77° N), Kiruna (68° N), Harestua (60° N), Jungfraujoch (47° N), Izaña (28° N), Wollongong (34° S) and Lauder (45° S). The length of the FTIR time series varies by station but is typically from about 1995 to present. We applied to the monthly means of the ozone total and four partial columns a stepwise multiple regression model including the following proxies: solar cycle, quasi-biennial oscillation (QBO), El Niño-Southern Oscillation (ENSO), Arctic and Antarctic Oscillation (AO/AAO), tropopause pressure (TP), equivalent latitude (EL), Eliassen-Palm flux (EPF), and volume of polar stratospheric clouds (VPSC). At the Arctic stations, the trends are found mostly negative in the troposphere and lower stratosphere, very mixed in the middle stratosphere, positive in the upper stratosphere due to a large increase in the 1995-2003 period, and non-significant when considering the total columns. The trends for mid-latitude and subtropical stations are all non-significant, except at Lauder in the troposphere and upper stratosphere and at Wollongong for the total columns and the lower and middle stratospheric columns where they are found positive. At Jungfraujoch, the upper stratospheric trend is close to significance (+0.9 ± 1.0% decade−1). Therefore, some signs of the onset of ozone mid-latitude recovery are observed only in the Southern Hemisphere, while a few more years seem to be needed to observe it at the northern
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- 2015
9. Ship emissions of SO2 and NO2: DOAS measurements from airborne platforms
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Berg, N., Mellqvist, J., Jalkanen, J.-P., and Balzani, J.
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lcsh:TA715-787 ,lcsh:Earthwork. Foundations ,lcsh:TA170-171 ,lcsh:Environmental engineering - Abstract
A unique methodology to measure gas fluxes of SO2 and NO2 from ships has been developed in a Swedish national project using optical remote sensing. The measurement system is based on Differential Optical Absor ption Spectroscopy using reflected skylight from the water surface as light source. A grating spectrometer records spectra around 311 nm and 440 nm, respectively, with the telescope pointed downward at a 30 degree angle from the horizon. The mass column values of SO2 and NO2 are retrieved from each spectrum and integrated across the plume. To obtain the total emission in kg h−1 the resulting total mass across the plume is multiplied with the apparent wind, i.e. a dilution factor corresponding to the vector between the wind and the ship speed. The system was tested in two feasibility studies in the Baltic Sea and Kattegat, from a CASA-212 air plane in 2008 and in the Nor th Sea outside Rotterdam from a Dauphin helicopter in an EU campaign in 2009. In the Baltic Sea the average SO2 emission out of 22 ships was (54 ± 13) kg h− , and the average NO2 emission was (33± 8) kg h−1out of 13 ships. In the Nor th Sea the average SO2 emission out of 21 ships was 15 (42 ± 11) kg h−, NO2 was not measured here. The system was able to detect plumes of SO2 in 60 % of the measurements when the described method was used. The optical measurement carried out on a passenger ferr y on two consecutive days was compared to onboard emission data obtained from analysed fuel content and power consumption. The comparison shows agreement of (−30 ± 14) % and 20 (−41 ± 11) %, respectively, for two days, with equal measurement precision of about 20%, this indicates the presence of systematic error sources that are yet unaccounted for when deriving the flux. Two such error sources are the difficulty in estimating the optical path of the ocean scattered light due to waves, and direct and multiple scattering in the exhaust plume. Rough estimates of these sources have been accounted for in the total uncer tainty, 30–45 %. A ship emission model, FMI-STEAM, has been compared to the optical measurements showing a 18 % overestimation and a correlation coefficient (R 2 ) of 0.6. It is AMTD shown that a combination of the optical method with modelled power consumption can estimate the sulphur fuel content within 40 %, which would be sufficient to detect the difference between ships running at 1 % and at 0.1 %, limits applicable within the IMO regulated areas., JRC.H.2-Air and Climate
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- 2011
10. Carbon monoxide (CO) and ethane (C₂H₆) trends from ground-based solar FTIR measurements at six European stations, comparison and sensitivity analysis with the EMEP model
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Angelbratt, J., Mellqvist, J., Simpson, D., Jonson, J. E., Blumenstock, T., Borsdorff, T., Duchatelet, P., Forster, F., Hase, F., Mahieu, E., De Maziere, M., Notholt, J., Petersen, A. K., Raffalski, U., Servais, C., Sussmann, R., Warneke, T., and Vigouroux, C.
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Earth sciences ,ddc:550 - Abstract
Trends in the CO and C2H6 partial columns (~0–15 km) have been estimated from four European groundbasedsolar FTIR (Fourier Transform InfraRed) stations for the 1996–2006 time period. The CO trends from the four stations Jungfraujoch, Zugspitze, Harestua and Kiruna have been estimated to −0.45±0.16%yr−1, −1.00 ± 0.24%yr−1, −0.62±0.19%yr−1 and −0.61±0.16%yr−1, respectively. The corresponding trends for C2H6 are−1.51±0.23%yr−1, −2.11±0.30%yr−1, −1.09±0.25%yr−1 and −1.14±0.18%yr−1. All trends are presented with their 2-σ confidence intervals. To find possible reasons for the CO trends, the global-scale EMEP MSC-W chemical transport model has been used in a series of sensitivity scenarios. It is shown that the trends are consistent with the combination of a 20% decrease in the anthropogenic CO emissions seen in Europe and North America during the 1996–2006 period and a 20% increase in the anthropogenic CO emissions in East Asia, during the same time period. The possible impacts of CH4 and biogenic volatile organic compounds (BVOCs) are also considered. The European and global-scale EMEP models have been evaluated against the measured CO and C2H6 partial columns from Jungfraujoch, Zugspitze, Bremen, Harestua, Kiruna and Ny-Ålesund. The European model reproduces, on average the measurements at the different sites fairly well and within 10–22% deviation for CO and 14–31% deviation for C2H6. Their seasonal amplitude is captured within 6–35% and 9–124% for CO and C2H6, respectively. However, 61–98% of the CO and C2H6 partial columns in the European model are shown to arise from the boundary conditions, making the globalscale model a more suitable alternative when modeling these two species. In the evaluation of the global model the average partial columns for 2006 are shown to be within 1–9% and 37–50% of the measurements for CO and C2H6, respectively. The global model sensitivity for assumptions made in this paper is also analyzed.
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- 2011
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11. A new method to detect long term trends of methane (CH₄) and nitrous oxide (N₂O) total columns measured within the NDACC ground-based high resolution solar FTIR network
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Angelbratt, J., Mellqvist, J., Blumenstock, T., Borsdorff, T., Brohede, S., Duchatelet, P., Forster, F., Hase, F., Mahieu, E., Murtagh, D., Petersen, A. K., Schneider, M., Sussmann, R., and Urban, J.
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ddc:620 ,Engineering & allied operations - Abstract
Total columns measured with the ground-based solar FTIR technique are highly variable in time due to atmospheric chemistry and dynamics in the atmosphere above the measurement station. In this paper, a multiple regression model with anomalies of air pressure, total columns of hydrogen fluoride (HF) and carbon monoxide (CO) and tropopause height are used to reduce the variability in the methane (CH4) and nitrous oxide (N2O) total columns to estimate reliable linear trends with as small uncertainties as possible. The method is developed at the Harestua station (60°N, 11°E, 600ma.s.l.) and used on three other European FTIR stations, i.e. Jungfraujoch (47°N, 8°E, 3600ma.s.l.), Zugspitze (47°N, 11°E, 3000ma.s.l.), and Kiruna (68°N, 20°E, 400ma.s.l.). Linear CH4 trends between 0.13±0.01-0.25±0.02%yr−1 were estimated for all stations in the 1996-2009 period. A piecewise model with three separate linear trends, connected at change points, was used to estimate the short term fluctuations in the CH4 total columns. This model shows a growth in 1996–1999 followed by a period of steady state until 2007. From 2007 until 2009 the atmospheric CH4 amount increases between 0.57±0.22–1.15±0.17%yr−1. Linear N2O trends between 0.19±0.01–0.40±0.02%yr−1 were estimated for all stations in the 1996-2007 period, here with the strongest trend at Harestua and Kiruna and the lowest at the Alp stations. From the N2O total columns crude tropospheric and stratospheric partial columns were derived, indicating that the observed difference in the N2O trends between the FTIR sites is of stratospheric origin. This agrees well with the N2O measurements by the SMR instrument onboard the Odin satellite showing the highest trends at Harestua, 0.98±0.28%yr−1, and considerably smaller trends at lower latitudes, 0.27±0.25%yr−1. The multiple regression model was compared with two other trend methods, the ordinary linear regression and a Bootstrap algorithm. The multiple regression model estimated CH4 and N2O trends that differed up to 31% compared to the other two methods and had uncertainties that were up to 300% lower. Since the multiple regression method were carefully validated this stresses the importance to account for variability in the total columns when estimating trend from solar FTIR data.
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- 2011
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12. Emission factors of SO<sub>2</sub>, NO<sub><i>x</i></sub> and particles from ships in Neva Bay from ground-based and helicopter-borne measurements and AIS-based modeling
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Beecken, J., primary, Mellqvist, J., additional, Salo, K., additional, Ekholm, J., additional, Jalkanen, J.-P., additional, Johansson, L., additional, Litvinenko, V., additional, Volodin, K., additional, and Frank-Kamenetsky, D. A., additional
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- 2015
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13. Trends of ozone total columns and vertical distribution from FTIR observations at eight NDACC stations around the globe
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Vigouroux, C., primary, Blumenstock, T., additional, Coffey, M., additional, Errera, Q., additional, García, O., additional, Jones, N. B., additional, Hannigan, J. W., additional, Hase, F., additional, Liley, B., additional, Mahieu, E., additional, Mellqvist, J., additional, Notholt, J., additional, Palm, M., additional, Persson, G., additional, Schneider, M., additional, Servais, C., additional, Smale, D., additional, Thölix, L., additional, and De Mazière, M., additional
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- 2015
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14. Optimized and harmonized FTIR retrieval strategy for CH₄ and N₂O columns and profiles
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Sussmann, R., Forster, F., Borsdorff, T., Maziere, M. de, Vigouroux, C., Blumenstock, T., Duchatelet, P., Hannigan, J., Hase, F., Jones, N., Klyft, J., Mahieu, E., Mellqvist, J., Notholt, J., Petersen, K., Strong, K., and Taylor, J.
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Earth sciences ,ddc:550 - Published
- 2009
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15. Satellite validation of column-averaged methane on global scale: Harmonized data from 13 FTIR ground stations versus last generation ENVISAT/SCIAMACHY retrievals
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Sussmann, R., Forster, F., Borsdorff, T., Dils, B., Maziere, M. de, Vigouroux, C., Blumenstock, T., Buchwitz, M., Borrows, J. P., Duchatelet, P., Frankenberg, C., Hannigan, J., Hase, F., Jones, N., Klyft, J., Mahieu, E., Mellqvist, J., Notholt, J., Petersen, K., Schneising, O., Strong, K., and Taylor, J.
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Earth sciences ,ddc:550 - Published
- 2009
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16. Validation of ACE-FTS N2O measurements
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Strong, K., Wolff, M. A., Kerzenmacher, T. E., Walker, K. A., Bernath, P. F., Blumenstock, T., Boone, C., Catoire, Valéry, Coffey, M., De Mazière, M., Demoulin, P., Duchatelet, P., Dupuy, E., Hannigan, J., Höpfner, M., Glatthor, N., Griffith, D. W. T., Jin, J. J., Jones, N., Jucks, K., Kuellmann, H., Kuttippurath, J., Lambert, A., Mahieu, E., Mcconnell, J. C., Mellqvist, J., Mikuteit, S., Murtagh, D. P., Notholt, J., Piccolo, C., Raspollini, P., Ridolfii, M., Robert, Cédric, Schneider, M., Schrems, O., Semeniuk, K., Senten, C., Stiller, G. P., Strandberg, A., Taylor, James, Tétard, C., Toohey, M., Urban, Jakub, Warneke, T., Wood, S., Department of Physics [Toronto], University of Toronto, Department of Chemistry [Waterloo], University of Waterloo [Waterloo], Department of Chemistry, Forschungszentrum Karlsruhe and University of Karlsruhe, Laboratoire de physique et chimie de l'environnement (LPCE), Université d'Orléans (UO)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS), National Center for Atmospheric Research [Boulder] (NCAR), Belgian Institute for Space Aeronomy / Institut d'Aéronomie Spatiale de Belgique (BIRA-IASB), Institut d'Astrophysique et de Géophysique [Liège], Université de Liège, School of Chemistry, Department of Earth and Space Science and Engineering [York University - Toronto] (ESSE), York University [Toronto], Harvard-Smithsonian Center for Astrophysics (CfA), Smithsonian Institution-Harvard University [Cambridge], Institute of Environmental Physics [Bremen] (IUP), University of Bremen, Jet Propulsion Laboratory (JPL), California Institute of Technology (CALTECH)-NASA, Department of Radio and Space Science [Göteborg], Chalmers University of Technology [Göteborg], Department of Physics, Okayama University, Istituto di Fisica Applicata 'Nello Carrara' (IFAC), Consiglio Nazionale delle Ricerche [Roma] (CNR), Dipartimento di Chimica Fisica e Inorganica [Bologna], Alma Mater Studiorum Università di Bologna [Bologna] (UNIBO), Department of Bentho-pelagic processes, Alfred-Wegener-Institut, Helmholtz-Zentrum für Polar- und Meeresforschung (AWI), 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), National Institute of Water and Atmospheric Research [Lauder] (NIWA), Institut national des sciences de l'Univers (INSU - CNRS)-Université d'Orléans (UO)-Centre National de la Recherche Scientifique (CNRS), Harvard University-Smithsonian Institution, NASA-California Institute of Technology (CALTECH), and National Research Council of Italy | Consiglio Nazionale delle Ricerche (CNR)
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[SDU.OCEAN]Sciences of the Universe [physics]/Ocean, Atmosphere - Abstract
International audience; The Atmospheric Chemistry Experiment (ACE), also known as SCISAT, was launched on 12 August 2003, carrying two instruments that measure vertical profiles of atmospheric constituents using the solar occultation technique. One of these instruments, the ACE Fourier Transform Spectrometer (ACE-FTS), is measuring volume mixing ratio (VMR) profiles of nitrous oxide (N2O) from the upper troposphere to the lower mesosphere at a vertical resolution of about 3–4 km. In this study, the quality of the ACE-FTS version 2.2 N2O data is assessed through comparisons with coincident measurements made by other satellite, balloon-borne, aircraft, and ground-based instruments. These consist of vertical profile comparisons with the SMR, MLS, and MIPAS satellite instruments, multiple aircraft flights of ASUR, and single balloon flights of SPIRALE and FIRS-2, and partial column comparisons with a network of ground-based Fourier Transform InfraRed spectrometers (FTIRs). Overall, the quality of the ACE-FTS version 2.2 N2O VMR profiles is good over the entire altitude range from 5 to 60 km. Between 6 and 30 km, the mean absolute differences for the satellite comparisons lie between -42 ppbv and +17 ppbv, with most within ±20 ppbv. This corresponds to relative deviations from the mean that are within ±15%, except for comparisons with MIPAS near 30 km, for which they are as large as 22.5%. Between 18 and 30 km, the mean absolute differences are generally within ±10 ppbv, again excluding the aircraft and balloon comparisons. From 30 to 60 km, the mean absolute differences are within ±4 ppbv, and are mostly between -2 and +1 ppbv. Given the small N2O VMR in this region, the relative deviations from the mean are therefore large at these altitudes, with most suggesting a negative bias in the ACE-FTS data between 30 and 50 km. In the comparisons with the FTIRs, the mean relative differences between the ACE-FTS and FTIR partial columns are within ±6.6% for eleven of the twelve contributing stations. This mean relative difference is negative at ten stations, suggesting a small negative bias in the ACE-FTS partial columns over the altitude regions compared. Excellent correlation (R=0.964) is observed between the ACE-FTS and FTIR partial columns, with a slope of 1.01 and an intercept of -0.20 on the line fitted to the data.
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- 2008
17. Satellite validation of column-averaged methane on global scale: ground-based data from 15 FTIR stations versus last generation ENVISAT/SCIAMACHY retrievals
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Sussmann, R., Forster, F., Borsdorff, T., DeMaziere, M., Dils, B., Vigouroux, C., Blumenstock, T., Buchwitz, M., Burrows, J.P., Demoulin, P., Duchatelet, P., Frankenberg, C., Hannigan, J., Hase, F., Jones, N., Klyft, J., Kramer, I., Mahieu, E., Mellqvist, J., Notholt, J., Petersen, K., Schnelsing, O., Strandberg, A., Strong, K., Taylor, J., and Wood, S.
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Earth sciences ,ddc:550 - Published
- 2008
18. Method for evaluating trends in greenhouse gases from ground-based remote FTIR measurements over Europe
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Gardiner, T., Forbes, A., Woods, P., Demaziere, M., Vigouroux, C., Mahieu, E., Demoulin, P., Velazco, V., Notholt, J., Blumenstock, T., Hase, F., Kramer, I., Sussman, R., Stremme, W., Mellqvist, J., Strandberg, A., Ellingsen, K., Gauss, M., National Physical Laboratory [Teddington] (NPL), Belgisch Instituut voor Ruimte-Aëronomie (BIRA), Université de Liège, Institute of Environmental Physics [Bremen] (IUP), University of Bremen, Institute for Meteorology and Climate Research (IMK), Karlsruhe Institute of Technology (KIT), Chalmers University of Technology [Göteborg], and University of Oslo (UiO)
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[SDU.OCEAN]Sciences of the Universe [physics]/Ocean, Atmosphere ,010504 meteorology & atmospheric sciences ,13. Climate action ,010501 environmental sciences ,7. Clean energy ,01 natural sciences ,0105 earth and related environmental sciences - Abstract
This paper describes the statistical analysis of annual trends in long term datasets of greenhouse gas measurements taken over ten or more years. The analysis technique employs a bootstrap resampling method to determine both the long-term and intra-annual variability of the datasets, together with the uncertainties on the trend values. The method has been applied to data from a European network of ground-based solar FTIR instruments to determine the trends in the tropospheric, stratospheric and total columns of ozone, nitrous oxide, carbon monoxide, methane, ethane and HCFC-22. The suitability of the method has been demonstrated through statistical validation of the technique, and comparison with ground-based in-situ measurements and 3-D atmospheric models.
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- 2007
19. Validation of MIPAS ClONO₂ measurements
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Höpfner, M., Clarmann, T. von, Fischer, H., Funke, B., Glatthor, N., Grabowski, U., Kellmann, S., Kiefer, M., Linden, A., Milz, M., Steck, T., Stiller, G. P., Bernath, P., Blom, C. E., Blumenstock, T., Boone, C., Chance, K., Coffey, M. T., Friedl-Vallon, F., Griffith, D., Hannigan, J. W., Hase, F., Jones, N., Jucks, K. W., Keim, C., Kleinert, A., Kouker, W., Liu, G. Y., Mahieu, E., Mellqvist, J., Mikuteit, S., Notholt, J., Oelhaf, H., Piesch, C., Reddmann, T., Ruhnke, R., Schneider, M., Strandberg, A., Toon, G., Walker, K. A., Warneke, T., Wetzel, G., Wood, S., and Zander, R.
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Earth sciences ,ddc:550 - Published
- 2007
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20. Validation of MIPAS ClONO2 measurements
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Höpfner, M., Clarmann, T., Fischer, H., Funke, B., Glatthor, N., Grabowski, U., Kellmann, S., Kiefer, M., Linden, A., Milz, M., Steck, T., Stiller, G. P., Bernath, P., Blom, C. E., Blumenstock, Th, Boone, C., Chance, K., Coffey, M. T., Friedl-Vallon, F., Griffith, D., Hannigan, J. W., Hase, F., Jones, N., Jucks, K. W., Keim, C., Kleinert, A., Kouker, W., Liu, G. Y., Mahieu, E., Mellqvist, J., Mikuteit, S., Justus Notholt, Oelhaf, H., Piesch, C., Reddmann, T., Ruhnke, R., Schneider, M., Strandberg, A., Toon, G., Walker, K. A., Warneke, T., Wetzel, G., Wood, S., Zander, R., Institute for Meteorology and Climate Research (IMK), Karlsruhe Institute of Technology (KIT), Instituto de Astrofísica de Andalucía (IAA), Consejo Superior de Investigaciones Científicas [Madrid] (CSIC), Department of Chemistry, Harvard-Smithsonian Center for Astrophysics (CfA), Harvard University [Cambridge]-Smithsonian Institution, Atmospheric Chemistry Division [Boulder], National Center for Atmospheric Research [Boulder] (NCAR), Institut d'Astrophysique et de Géophysique [Liège], Université de Liège, Department of Radio and Space Science [Göteborg], Chalmers University of Technology [Göteborg], Institut für Umweltphysik [Bremen] (IUP), Universität Bremen, Jet Propulsion Laboratory (JPL), NASA-California Institute of Technology (CALTECH), Institut für Umweltphysik [Heidelberg], Universität Heidelberg [Heidelberg], and National Institute of Water and Atmospheric Research [Wellington] (NIWA)
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lcsh:Chemistry ,[SDU.OCEAN]Sciences of the Universe [physics]/Ocean, Atmosphere ,lcsh:QD1-999 ,lcsh:Physics ,lcsh:QC1-999 - Abstract
Altitude profiles of ClONO2 retrieved with the IMK (Institut für Meteorologie und Klimaforschung) science-oriented data processor from MIPAS/Envisat (Michelson Interferometer for Passive Atmospheric Sounding on Envisat) mid-infrared limb emission measurements between July 2002 and March 2004 have been validated by comparison with balloon-borne (Mark IV, FIRS2, MIPAS-B), airborne (MIPAS-STR), ground-based (Spitsbergen, Thule, Kiruna, Harestua, Jungfraujoch, Izaña, Wollongong, Lauder), and spaceborne (ACE-FTS) observations. With few exceptions we found very good agreement between these instruments and MIPAS with no evidence for any bias in most cases and altitude regions. For balloon-borne measurements typical absolute mean differences are below 0.05 ppbv over the whole altitude range from 10 to 39 km. In case of ACE-FTS observations mean differences are below 0.03 ppbv for observations below 26 km. Above this altitude the comparison with ACE-FTS is affected by the photochemically induced diurnal variation of ClONO2. Correction for this by use of a chemical transport model led to an overcompensation of the photochemical effect by up to 0.1 ppbv at altitudes of 30–35 km in case of MIPAS-ACE-FTS comparisons while for the balloon-borne observations no such inconsistency has been detected. The comparison of MIPAS derived total column amounts with ground-based observations revealed no significant bias in the MIPAS data. Mean differences between MIPAS and FTIR column abundances are 0.11±0.12×1014 cm−2 (1.0±1.1%) and −0.09±0.19×1014 cm−2 (−0.8±1.7%), depending on the coincidence criterion applied. χ2 tests have been performed to assess the combined precision estimates of MIPAS and the related instruments. When no exact coincidences were available as in case of MIPAS – FTIR or MIPAS – ACE-FTS comparisons it has been necessary to take into consideration a coincidence error term to account for χ2 deviations. From the resulting χ2 profiles there is no evidence for a systematic over/underestimation of the MIPAS random error analysis.
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- 2006
21. Modelling constraints on the emission inventory and on vertical diffusion for CO and SO2 in the Mexico City Metropolitan Area using Solar FTIR and zenith sky UV spectroscopy
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De Foy, B., Lei, W., Zavala, M., Volkamer, R., Samuelsson, J., Mellqvist, J., Galle, B., Martínez, A.-P., Grutter, M., Molina, L. T., Molina Center for the Energy and the Environment (MCE2), Department of Earth, Atmospheric and Planetary Sciences [MIT, Cambridge] (EAPS), Massachusetts Institute of Technology (MIT), Department of Chemistry and Biochemistry, Department of Radio and Space Science [Göteborg], Chalmers University of Technology [Göteborg], General Direction of the National Center for Environmental Research and Training (CENICA), Centro de Ciencias de la Atmosfera [Mexico], and Universidad Nacional Autónoma de México (UNAM)
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[SDU.OCEAN]Sciences of the Universe [physics]/Ocean, Atmosphere - Abstract
International audience; Emissions of air pollutants in and around urban areas lead to negative health impacts on the population. To estimate these impacts, it is important to know the sources and transport mechanisms of the pollutants accurately. Mexico City has a large urban fleet in a topographically constrained basin leading to high levels of carbon monoxide (CO). Large point sources of sulfur dioxide (SO2) surrounding the basin lead to episodes with high concentrations. An Eulerian grid model (CAMx) and a particle trajectory model (FLEXPART) are used to evaluate the estimates of CO and SO2 in the current emission inventory using mesoscale meteorological simulations from MM5. Vertical column measurements of CO are used to constrain the total amount of emitted CO in the model and to identify the most appropriate vertical diffusion scheme. Zenith sky UV spectroscopy is used to estimate the emissions of SO2 from a large power plant and the Popocatépetl volcano. Results suggest that the models are able to identify correctly large point sources and that both the power plant and the volcano impact the MCMA. Modelled concentrations of CO based on the current emission inventory match observations suggesting that the current total emissions estimate is correct. Possible adjustments to the spatial and temporal distribution can be inferred from model results. Accurate source and dispersion modelling provides feedback for development of the emission inventory, verification of transport processes in air quality models and guidance for policy decisions.
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- 2006
22. Comparisons between SCIAMACHY and ground-based FTIR data for total columns of CO, CH4, CO2 and N2O
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Dus, B., Mazière, M., Müller, J. F., Blumenstock, T., Buchwitz, M., Beek, R., Demoulin, P., Duchatelet, P., Fast, H., Frankenberg, C., Gloudemans, A., Griffith, D., Jones, N., Kerzenmacher, T., Kramer, I., Mahieu, E., Mellqvist, J., Mittermeier, R. L., Notholt, J., Rinsland, C. P., Schrijver, H., Smale, D., Strandberg, A., Straume, A. G., Wolfgang Michael Helmut Stremme, Strong, K., Sussmann, R., Taylor, J., Den Broek, M., Velazco, V., Wagner, T., Warneke, T., Wiacek, A., Wood, S., Belgian Institute for Space Aeronomy / Institut d'Aéronomie Spatiale de Belgique (BIRA-IASB), Forschungszentrum Karlsruhe and University Karlsruhe, Institute of Environmental Physics [Bremen] (IUP), University of Bremen, Institut d'Astrophysique et de Géophysique [Liège], Université de Liège, Environment and Climate Change Canada, SRON Netherlands Institute for Space Research (SRON), University of Wollongong [Australia], Department of Physics [Toronto], University of Toronto, Chalmers University of Technology [Göteborg], NASA Headquarters, National Institute of Water and Atmospheric Research [Lauder] (NIWA), and Forschungszentrum Karlsruhe
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lcsh:Chemistry ,[SDU.OCEAN]Sciences of the Universe [physics]/Ocean, Atmosphere ,lcsh:QD1-999 ,lcsh:Physics ,lcsh:QC1-999 - Abstract
International audience; Total column amounts of CO, CH4, CO2 and N2O retrieved from SCIAMACHY nadir observations in its near-infrared channels have been compared to data from a ground-based quasi-global network of Fourier-transform infrared (FTIR) spectrometers. The SCIAMACHY data considered here have been produced by three different retrieval algorithms, WFM-DOAS (version 0.5 for CO and CH4 and version 0.4 for CO2 and N2O), IMAP-DOAS (version 1.1 and 0.9 (for CO)) and IMLM (version 6.3) and cover the January to December 2003 time period. Comparisons have been made for individual data, as well as for monthly averages. To maximize the number of reliable coincidences that satisfy the temporal and spatial collocation criteria, the SCIAMACHY data have been compared with a temporal 3rd order polynomial interpolation of the ground-based data. Particular attention has been given to the question whether SCIAMACHY observes correctly the seasonal and latitudinal variability of the target species. The present results indicate that the individual SCIAMACHY data obtained with the actual versions of the algorithms have been significantly improved, but that the quality requirements, for estimating emissions on regional scales, are not yet met. Nevertheless, possible directions for further algorithm upgrades have been identified which should result in more reliable data products in a near future.
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- 2006
23. Comparisons between SCIAMACHY and ground-based FTIR data for total columns of CO, CH₄, CO₂ and N₂O
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Dils, B., De Maziere, M., Müller, J.F., Blumenstock, T., Buchwitz, M., De Beek, R., Demoulin, P., Duchatelet, P., Fast, H., Frankenberg, C., Gloudemans, A., Griffith, D., Jones, N., Kernzenmacher, T., Kramer, I., Mahieu, E., Mellqvist, J., Mittermeier, R.L., Notholt, J., Rinsland, C.P., Schrijver, H., Smale, D., Strandberg, A., Straume, A.G., Stremme, W., Strong, K., Sussmann, R., Taylor, J., Van Den Broek, M., Velazco, V., Wagner, T., Warneke, T., Wiacek, A., and Wood, S.
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Earth sciences ,ddc:550 - Abstract
Total column amounts of CO, CH4, CO2 and N2O retrieved from SCIAMACHY nadir observations in ist near-infrared channels have been compared to data from a ground-based quasi-global network of Fourier-transform infrared (FTIR) spectrometers. The SCIAMACHY data considered here have been produced by three different retrieval algorithms, WFM-DOAS (version 0.5 for CO and CH4 and version 0.4 for CO2 and N2O), IMAP-DOAS (version 1.1 and 0.9 (for CO)) and IMLM (version 6.3) and cover the January to December 2003 time period. Comparisons have been made for individual data, as well as for monthly averages. To maximize the number of reliable coincidences that satisfy the temporal and spatial collocation criteria, the SCIAMACHY data have been compared with a temporal 3rd order polynomial interpolation of the ground-based data. Particular attention has been given to the question whether SCIAMACHY observes correctly the seasonal and latitudinal variability of the target species. The present results indicate that the individual SCIAMACHY data obtained with the actual versions of the algorithms have been significantly improved, but that the quality requirements, for estimating emissions on regional scales, are not yet met. Nevertheless, possible directions for further algorithm upgrades have been identified which should result in more reliable data products in a near future.
- Published
- 2006
24. Comparisons between SCIAMACHY and ground-based FTIR data for total columns of CO, CH4, CO2 and N2O
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Dils, B., De Mazière, M., Blumenstock, T., Buchwitz, M., De Beek, R., Demoulin, P., Duchatelet, P., Fast, H., Frankenberg, C., Gloudemans, A., Griffith, D., Jones, N., Kerzenmacher, T., Kramer, I., Mahieu, E., Mellqvist, J., Mittermeier, R. L., Notholt, J., Rinsland, C. P., Schrijver, H., Smale, D., Strandberg, A., Straume, A. G., Stremme, W., Strong, K., Sussmann, R., Taylor, James, Van Den Broek, M., Wagner, T., Warneke, T., Wiacek, A., Wood, S., Belgian Institute for Space Aeronomy / Institut d'Aéronomie Spatiale de Belgique (BIRA-IASB), Forschungszentrum Karlsruhe, Institute of Environmental Physics [Bremen] (IUP), University of Bremen, Institut d'Astrophysique et de Géophysique [Liège], Université de Liège, Meteorological Service of Canada (MSC), University of Wollongong [Australia], University of Toronto, Chalmers University of Technology [Göteborg], NASA Headquarters, and SRON Netherlands Institute for Space Research (SRON)
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[SDU.OCEAN]Sciences of the Universe [physics]/Ocean, Atmosphere - Abstract
International audience; Total column amounts of CO, CH4, CO2 and N2O retrieved from SCIAMACHY nadir observations in its near-infrared channels have been compared to data from a ground-based quasi-global network of Fourier-transform infrared (FTIR) spectrometers. The SCIAMACHY data considered here have been produced by three different retrieval algorithms, WFM-DOAS (version 0.4, 0.41 for CH4), IMAP-DOAS (version 0.9) and IMLM (version 5.5) and cover the January to December 2003 time period. Comparisons have been made for individual data, as well as for monthly averages. To maximize the number of reliable coincidences that satisfy the temporal and spatial collocation criteria, the SCIAMACHY data have been compared with a temporal 3rd order polynomial interpolation of the ground-based data. Particular attention has been given to the question whether SCIAMACHY observes correctly the seasonal and latitudinal variability of the target species. The ensemble of comparisons, discussed in this paper, demonstrate the capability of SCIAMACHY, using any of the three algorithms, to deliver products for the target species under consideration, which are already useful for qualitative geophysical studies on a global scale. It is expected that the remaining uncertainties in the data products will decrease in future versions of the algorithm to also allow more quantitative investigations on a regional scale.
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- 2005
25. Supplementary material to "Emission factors of SO2, NOx and particles from ships in Neva Bay from ground-based and helicopter-borne measurements and AIS-based modeling"
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Beecken, J., primary, Mellqvist, J., additional, Salo, K., additional, Ekholm, J., additional, Jalkanen, J.-P., additional, Johansson, L., additional, Litvinenko, V., additional, Volodin, K., additional, and Frank-Kamenetsky, D. A., additional
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- 2014
- Full Text
- View/download PDF
26. Emission factors of SO2, NOx and particles from ships in Neva Bay from ground-based and helicopter-borne measurements and AIS-based modeling
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Beecken, J., primary, Mellqvist, J., additional, Salo, K., additional, Ekholm, J., additional, Jalkanen, J.-P., additional, Johansson, L., additional, Litvinenko, V., additional, Volodin, K., additional, and Frank-Kamenetsky, D. A., additional
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- 2014
- Full Text
- View/download PDF
27. Trends of ozone total columns and vertical distribution from FTIR observations at 8 NDACC stations around the globe
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Vigouroux, C., primary, Blumenstock, T., additional, Coffey, M., additional, Errera, Q., additional, García, O., additional, Jones, N. B., additional, Hannigan, J. W., additional, Hase, F., additional, Liley, B., additional, Mahieu, E., additional, Mellqvist, J., additional, Notholt, J., additional, Palm, M., additional, Persson, G., additional, Schneider, M., additional, Servais, C., additional, Smale, D., additional, Thölix, L., additional, and De Mazière, M., additional
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- 2014
- Full Text
- View/download PDF
28. Field test of available methods to measure remotely SO<sub>x</sub> and NO<sub>x</sub> emissions from ships
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Balzani Lööv, J. M., primary, Alfoldy, B., additional, Gast, L. F. L., additional, Hjorth, J., additional, Lagler, F., additional, Mellqvist, J., additional, Beecken, J., additional, Berg, N., additional, Duyzer, J., additional, Westrate, H., additional, Swart, D. P. J., additional, Berkhout, A. J. C., additional, Jalkanen, J.-P., additional, Prata, A. J., additional, van der Hoff, G. R., additional, and Borowiak, A., additional
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- 2014
- Full Text
- View/download PDF
29. Airborne emission measurements of SO<sub>2</sub> , NO<sub>x</sub> and particles from individual ships using a sniffer technique
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Beecken, J., primary, Mellqvist, J., additional, Salo, K., additional, Ekholm, J., additional, and Jalkanen, J.-P., additional
- Published
- 2014
- Full Text
- View/download PDF
30. Supplementary material to "Airborne emission measurements of SO2, NOx and particles from individual ships using sniffer technique"
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Beecken, J., primary, Mellqvist, J., additional, Salo, K., additional, Ekholm, J., additional, and Jalkanen, J.-P., additional
- Published
- 2013
- Full Text
- View/download PDF
31. Airborne emission measurements of SO2, NOx and particles from individual ships using sniffer technique
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Beecken, J., primary, Mellqvist, J., additional, Salo, K., additional, Ekholm, J., additional, and Jalkanen, J.-P., additional
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- 2013
- Full Text
- View/download PDF
32. Field test of available methods to measure remotely SO<sub>2</sub> and NO<sub>x</sub> emissions from ships
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Balzani Lööv, J. M., primary, Alfoldy, B., additional, Beecken, J., additional, Berg, N., additional, Berkhout, A. J. C., additional, Duyzer, J., additional, Gast, L. F. L., additional, Hjorth, J., additional, Jalkanen, J.-P., additional, Lagler, F., additional, Mellqvist, J., additional, Prata, F., additional, van der Hoff, G. R., additional, Westrate, H., additional, Swart, D. P. J., additional, and Borowiak, A., additional
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- 2013
- Full Text
- View/download PDF
33. Validation of five years (2003-2007) of SCIAMACHY CO total column measurements using ground-based spectrometer observations
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de Laat, A.T.J., Gloudemans, A.M.S., Schrijver, H., Aben, E.A.A., Nagahama, Y., Suzuki, K., Mahieu, E., Jones, N.B., Paton-Walsh, C., Deutscher, N.M., Griffith, D.W.T., De Maziere, M., Mittermeier, R.L., Fast, H., Notholt, J., Palm, M., Hawat, T., Blumenstock, T., Hase, F., Schneider, M., Rinsland, C., Dzhola, A.V., Grechko, E.I., Poberovskii, A.M., Makarova, M.V., Mellqvist, J., Strandberg, A., Sussmann, R., Borsdorff, T., de Laat, A.T.J., Gloudemans, A.M.S., Schrijver, H., Aben, E.A.A., Nagahama, Y., Suzuki, K., Mahieu, E., Jones, N.B., Paton-Walsh, C., Deutscher, N.M., Griffith, D.W.T., De Maziere, M., Mittermeier, R.L., Fast, H., Notholt, J., Palm, M., Hawat, T., Blumenstock, T., Hase, F., Schneider, M., Rinsland, C., Dzhola, A.V., Grechko, E.I., Poberovskii, A.M., Makarova, M.V., Mellqvist, J., Strandberg, A., Sussmann, R., and Borsdorff, T.
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- 2010
- Full Text
- View/download PDF
34. Validation of five years (2003-2007) of SCIAMACHY CO total column measurements using ground-based spectrometer observations
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de Laat, A T. J, Gloudemans, A M. S, Schrijver, H, Aben, I, Nagahama, Y, Suzuki, K, Mahieu, E, Jones, N B, Paton-Walsh, Clare, Deutscher, N M, Griffith, D W. T, De Maziere, M, Mittermeier, R L, Fast, H, Notholt, J, Palm, M, Hawat, T, Blumenstock, T, Hase, F, Schneider, M, Rinsland, C, Dzhola, A V, Grechko, E I, Poberovskii, A M, Makarova, M V, Mellqvist, J, Strandberg, A, Sussmann, R, Borsdorff, T, Rettinger, M, de Laat, A T. J, Gloudemans, A M. S, Schrijver, H, Aben, I, Nagahama, Y, Suzuki, K, Mahieu, E, Jones, N B, Paton-Walsh, Clare, Deutscher, N M, Griffith, D W. T, De Maziere, M, Mittermeier, R L, Fast, H, Notholt, J, Palm, M, Hawat, T, Blumenstock, T, Hase, F, Schneider, M, Rinsland, C, Dzhola, A V, Grechko, E I, Poberovskii, A M, Makarova, M V, Mellqvist, J, Strandberg, A, Sussmann, R, Borsdorff, T, and Rettinger, M
- Abstract
This paper presents a validation study of SCanning Imaging Absorption spectroMeter for Atmospheric CHartographY (SCIAMACHY) carbon monoxide (CO) total column measurements from the Iterative Maximum Likelihood Method (IMLM) algorithm using ground-based spectrometer observations from twenty surface stations for the five year time period of 2003–2007. Overall we find a good agreement between SCIAMACHY and ground-based observations for both mean values as well as seasonal variations. For high-latitude Northern Hemisphere stations absolute differences between SCIAMACHY and ground-based measurements are close to or fall within the SCIAMACHY CO 2 precision of 0.2×1018 molecules/cm2 (10%) indicating that SCIAMACHY can observe CO accurately at high Northern Hemisphere latitudes. For Northern Hemisphere mid-latitude stations the validation is complicated due to the vicinity of emission sources for almost all stations, leading to higher ground-based measurements compared to SCIAMACHY CO within its typical sampling area of 8 ×8. Comparisons with Northern Hemisphere mountain stations are hampered by elevation effects. After accounting for these effects, the validation provides satisfactory results
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- 2010
35. Airborne Measurements of Ethene from Industrial Sources Using Laser Photo-Acoustic Spectroscopy
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Gouw, J.A. De, Lintel Hekkert, Sacco te, Mellqvist, J., Warneke, C., Atlas, E.L., Fehsenfeld, F.C., Fried, A., Frost, G.J., Harren, F.J.M., Holloway, J.S., Lefer, B., Lueb, R., Meagher, J.F., Parrish, D.D., Patel, M., Pope, L., Richter, D., Rivera, C., Ryerson, T.B., Samuelsson, J., Walega, J., Washenfelder, R.A., Weibring, P., Zhu, X., Gouw, J.A. De, Lintel Hekkert, Sacco te, Mellqvist, J., Warneke, C., Atlas, E.L., Fehsenfeld, F.C., Fried, A., Frost, G.J., Harren, F.J.M., Holloway, J.S., Lefer, B., Lueb, R., Meagher, J.F., Parrish, D.D., Patel, M., Pope, L., Richter, D., Rivera, C., Ryerson, T.B., Samuelsson, J., Walega, J., Washenfelder, R.A., Weibring, P., and Zhu, X.
- Abstract
Contains fulltext : 75227pub.pdf (publisher's version ) (Closed access)
- Published
- 2009
36. Validation of ozone measurements from the Atmospheric Chemistry Experiment (ACE)
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Burrows, J. P., Christensen, T., Dupuy, E., Walker, K. A., Kar, J., Boone, C. D., McElroy, C. T., Bernath, P. F., Drummond, J. R., Skelton, R., McLeod, S. D., Hughes, R. C., Nowlan, C. R., Dufour, D. G., Zou, J., Nichitiu, F., Strong, K., Baron, P., Bevilacqua, R. M., Blumenstock, T., Bodeker, G. E., Borsdorff, T., Bourassa, A. E., Bovensmann, H., Boyd, I. S., Bracher, Astrid, Brogniez, C., Catoire, V., Ceccherini, S., Chabrillat, S., Coffey, M. T., Cortesi, U., Davies, J., De Clercq, C., Degenstein, D. A., De Maziere, M., Demoulin, P., Dodion, J., Firanski, B., Fischer, Hubertus, Forbes, G., Froidevaux, L., Fussen, D., Gerard, P., Godin-Beekmann, S., Goutail, F., Granville, J., Griffith, D., Haley, C. S., Hannigan, J. W., Höpfner, M., Jin, J. J., Jones, A., Jones, N. B., Jucks, K., Kagawa, A., Kasai, Y., Kerzenmacher, T. E., Kleinböhl, A., Klekociuk, A. R., Kramer, I., Küllmann, H., Kuttippurath, J., Kyrölä, E., Lambert, J. C., Livesey, N. J., Llewellyn, E. J., Lloyd, N. D., Mahieu, E., Manney, G. L., Marshall, B. T., McConnell, J. C., McCormick, M. P., McDermid, I. S., McHugh, M., McLinden, C. A., Mellqvist, J., Mizutani, K., Murayama, Y., Murtagh, D. P., Oelhaf, H., Parrish, A., Petelina, S. V., Piccolo, C., Pommereau, J.-P., Randall, C. E., Robert, C., Roth, C., Russell III, J. M., Schneider, M., Senten, C., Steck, T., Strandberg, A., Strawbridge, K. B., Sussmann, R., Swart, D. P. J., Tarasick, D. W., Taylor, James, Tétard, C., Thomason, L. W., Thompson, A. M., Tully, M. B., Urban, J., Vanhellemont, F., von Clarmann, T., von der Gathen, Peter, von Savigny, C., Waters, J. W., Witte, J. C., Wolff, Martha Maria, Zawodny, J. M., Burrows, J. P., Christensen, T., Dupuy, E., Walker, K. A., Kar, J., Boone, C. D., McElroy, C. T., Bernath, P. F., Drummond, J. R., Skelton, R., McLeod, S. D., Hughes, R. C., Nowlan, C. R., Dufour, D. G., Zou, J., Nichitiu, F., Strong, K., Baron, P., Bevilacqua, R. M., Blumenstock, T., Bodeker, G. E., Borsdorff, T., Bourassa, A. E., Bovensmann, H., Boyd, I. S., Bracher, Astrid, Brogniez, C., Catoire, V., Ceccherini, S., Chabrillat, S., Coffey, M. T., Cortesi, U., Davies, J., De Clercq, C., Degenstein, D. A., De Maziere, M., Demoulin, P., Dodion, J., Firanski, B., Fischer, Hubertus, Forbes, G., Froidevaux, L., Fussen, D., Gerard, P., Godin-Beekmann, S., Goutail, F., Granville, J., Griffith, D., Haley, C. S., Hannigan, J. W., Höpfner, M., Jin, J. J., Jones, A., Jones, N. B., Jucks, K., Kagawa, A., Kasai, Y., Kerzenmacher, T. E., Kleinböhl, A., Klekociuk, A. R., Kramer, I., Küllmann, H., Kuttippurath, J., Kyrölä, E., Lambert, J. C., Livesey, N. J., Llewellyn, E. J., Lloyd, N. D., Mahieu, E., Manney, G. L., Marshall, B. T., McConnell, J. C., McCormick, M. P., McDermid, I. S., McHugh, M., McLinden, C. A., Mellqvist, J., Mizutani, K., Murayama, Y., Murtagh, D. P., Oelhaf, H., Parrish, A., Petelina, S. V., Piccolo, C., Pommereau, J.-P., Randall, C. E., Robert, C., Roth, C., Russell III, J. M., Schneider, M., Senten, C., Steck, T., Strandberg, A., Strawbridge, K. B., Sussmann, R., Swart, D. P. J., Tarasick, D. W., Taylor, James, Tétard, C., Thomason, L. W., Thompson, A. M., Tully, M. B., Urban, J., Vanhellemont, F., von Clarmann, T., von der Gathen, Peter, von Savigny, C., Waters, J. W., Witte, J. C., Wolff, Martha Maria, and Zawodny, J. M.
- Abstract
This paper presents extensive {bias determination} analyses of ozone observations from the Atmospheric Chemistry Experiment (ACE) satellite instruments: the ACE Fourier Transform Spectrometer (ACE-FTS) and the Measurement of Aerosol Extinction in the Stratosphere and Troposphere Retrieved by Occultation (ACE-MAESTRO) instrument. Here we compare the latest ozone data products from ACE-FTS and ACE-MAESTRO with coincident observations from nearly 20 satellite-borne, airborne, balloon-borne and ground-based instruments, by analysing volume mixing ratio profiles and partial column densities. The ACE-FTS version 2.2 Ozone Update product reports more ozone than most correlative measurements from the upper troposphere to the lower mesosphere. At altitude levels from 16 to 44 km, the average values of the mean relative differences are nearly all within +1 to +8%. At higher altitudes (4560 km), the ACE-FTS ozone amounts are significantly larger than those of the comparison instruments, with mean relative differences of up to +40% (about +20% on average). For the ACE-MAESTRO version 1.2 ozone data product, mean relative differences are within ±10% (average values within ±6%) between 18 and 40 km for both the sunrise and sunset measurements. At higher altitudes (~3555 km), systematic biases of opposite sign are found between the ACE-MAESTRO sunrise and sunset observations. While ozone amounts derived from the ACE-MAESTRO sunrise occultation data are often smaller than the coincident observations (with mean relative differences down to −10%), the sunset occultation profiles for ACE-MAESTRO show results that are qualitatively similar to ACE-FTS, indicating a large positive bias (mean relative differences within +10 to +30%) in the 4555 km altitude range. In contrast, there is no significant systematic difference in bias found for the ACE-FTS sunrise and sunset measurements.
- Published
- 2009
37. Validation of ozone measurements from the Atmospheric Chemistry Experiment (ACE)
- Author
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Jones, Nicholas B, Griffith, David W, Wolff, M, Mahieu, E, Bodeker, G, Boyd, I, De Maziere, M, Demoulin, P, Blumenstock, T, Murayama, Y., Kagawa, A., Jin, J, McElroy, Christopher, Hannigan, J, Coffey, M, Hopfner, M, Fischer, H W, Kerzenmacher, T, Kramer, I, Mellqvist, J, Sussmann, R, Strong, K, Taylor, J R, Mizutani, K, Kasai, Y, Urban, J, Murtagh, D, Dupuy, E, Catoire, V, Chabrillat, S, Baron, P, Brogniez, C, Manney, G L, Piccolo, C, Randall, C, Robert, C, Senten, C, Tetard, C, Livesey, N J, Kleinbohl, A, Godin-Beekmann, S, Borsdorff, T, Drummond, James, De Clercq, C, Lambert, J C, Cortesi, U, Jucks, K W, Boone, C, Oelhaf, H, Schneider, M, Steck, T, Walker, K A, Bernath, P, von Clarmann, T, Hughes, R, Vigouroux, C, Kuttippurath, J, Bracher, A, McConnell, J, McLinden, C, Kullmann, H, Froidevaux, L, Dodion, J, Vanhellemont, F, Burrows, J P, kar, J, Goutail, F, Dufour, D G, Zawodny, J M, Nichitiu, F, Pommereau, J-P, Nowlan, C, Fussen, D, Zou, J, Klekociuk, A R, Forbes, G, Bovensmann, H, Bevilacqua, R M, Haley, C, Ceccherini, S, McLeod, S D, Gerard, P, Skelton, R, Firanski, B, Bourassa, A E, Degenstein, D A, Davies, J, Christensen, T, Granville, J, Parrish, A, Roth, C, Waters, J W, von Savigny, C, Standberg, A, McHugh, M, Thompson, A M, Llewellyn, E J, von der Gathen, P, Tully, M B, Witte, J C, Marshall, B T, Strawbridge, K B, Kyrola, E, McCormick, M P, Swart, D P J, Lloyd, N D, Tarasick, D W, Petelina, S V, Thomason, L W, Jones, A, McDermid, I S, Jones, Nicholas B, Griffith, David W, Wolff, M, Mahieu, E, Bodeker, G, Boyd, I, De Maziere, M, Demoulin, P, Blumenstock, T, Murayama, Y., Kagawa, A., Jin, J, McElroy, Christopher, Hannigan, J, Coffey, M, Hopfner, M, Fischer, H W, Kerzenmacher, T, Kramer, I, Mellqvist, J, Sussmann, R, Strong, K, Taylor, J R, Mizutani, K, Kasai, Y, Urban, J, Murtagh, D, Dupuy, E, Catoire, V, Chabrillat, S, Baron, P, Brogniez, C, Manney, G L, Piccolo, C, Randall, C, Robert, C, Senten, C, Tetard, C, Livesey, N J, Kleinbohl, A, Godin-Beekmann, S, Borsdorff, T, Drummond, James, De Clercq, C, Lambert, J C, Cortesi, U, Jucks, K W, Boone, C, Oelhaf, H, Schneider, M, Steck, T, Walker, K A, Bernath, P, von Clarmann, T, Hughes, R, Vigouroux, C, Kuttippurath, J, Bracher, A, McConnell, J, McLinden, C, Kullmann, H, Froidevaux, L, Dodion, J, Vanhellemont, F, Burrows, J P, kar, J, Goutail, F, Dufour, D G, Zawodny, J M, Nichitiu, F, Pommereau, J-P, Nowlan, C, Fussen, D, Zou, J, Klekociuk, A R, Forbes, G, Bovensmann, H, Bevilacqua, R M, Haley, C, Ceccherini, S, McLeod, S D, Gerard, P, Skelton, R, Firanski, B, Bourassa, A E, Degenstein, D A, Davies, J, Christensen, T, Granville, J, Parrish, A, Roth, C, Waters, J W, von Savigny, C, Standberg, A, McHugh, M, Thompson, A M, Llewellyn, E J, von der Gathen, P, Tully, M B, Witte, J C, Marshall, B T, Strawbridge, K B, Kyrola, E, McCormick, M P, Swart, D P J, Lloyd, N D, Tarasick, D W, Petelina, S V, Thomason, L W, Jones, A, and McDermid, I S
- Abstract
This paper presents extensive bias determination analyses of ozone observations from the Atmospheric Chemistry Experiment (ACE) satellite instruments: the ACE Fourier Transform Spectrometer (ACE-FTS) and the Measurement of Aerosol Extinction in the Stratosphere and Troposphere Retrieved by Occultation (ACE-MAESTRO) instrument. Here we compare the latest ozone data products from ACE-FTS and ACE-MAESTRO with coincident observations from nearly 20 satellite-borne, airborne, balloonborne and ground-based instruments, by analysing volume mixing ratio profiles and partial column densities. The ACEFTS version 2.2 Ozone Update product reports more ozone than most correlative measurements from the upper troposphere to the lower mesosphere. At altitude levels from 16 to 44 km, the average values of the mean relative differences are nearly all within +1 to +8%. At higher altitudes (45¿60 km), the ACE-FTS ozone amounts are significantly larger than those of the comparison instruments, with mean relative differences of up to +40% (about +20% on average). For the ACE-MAESTRO version 1.2 ozone data product, mean relative differences are within +10% (average values within +6%) between 18 and 40 km for both the sunrise and sunset measurements. At higher altitudes (35¿55 km), systematic biases of opposite sign are found between the ACEMAESTRO sunrise and sunset observations. While ozone amounts derived from the ACE-MAESTRO sunrise occultation data are often smaller than the coincident observations (with mean relative differences down to ¿10%), the sunset occultation profiles for ACE-MAESTRO show results that are qualitatively similar to ACE-FTS, indicating a large positive bias (mean relative differences within +10 to +30%) in the 45¿55 km altitude range. In contrast, there is no significant systematic difference in bias found for the ACE-FTS sunrise and sunset measurements.
- Published
- 2009
38. Validation of ACE-FTS N2O measurements
- Author
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Strong, K, Wolff, M, Kerzenmacher, T, Walker, K A, Jones, Nicholas B, Griffith, David W, Mahieu, E, Wood, S, De Maziere, M, Demoulin, P, Blumenstock, T, Jin, J, Hannigan, J, Coffey, M, Hopfner, M, Duchatelet, P, Mellqvist, J, Strandberg, A, Taylor, J R, Warneke, Thorsten, Urban, J, Murtagh, D, Dupuy, E, Catoire, V, Piccolo, C, Robert, C, Senten, C, Tetard, C, Jucks, K W, Boone, C, Glatthor, N, Schneider, M, Mikuteit, S, Stiller, G P, Bernath, P, Schrems, O, Kuellmann, H, Raspollini, P, Lambert, A, McConnell, J, kittippurath, J, Semeniuk, K, Toohey, M, Ridolfi, M, Notholt, Justus, Strong, K, Wolff, M, Kerzenmacher, T, Walker, K A, Jones, Nicholas B, Griffith, David W, Mahieu, E, Wood, S, De Maziere, M, Demoulin, P, Blumenstock, T, Jin, J, Hannigan, J, Coffey, M, Hopfner, M, Duchatelet, P, Mellqvist, J, Strandberg, A, Taylor, J R, Warneke, Thorsten, Urban, J, Murtagh, D, Dupuy, E, Catoire, V, Piccolo, C, Robert, C, Senten, C, Tetard, C, Jucks, K W, Boone, C, Glatthor, N, Schneider, M, Mikuteit, S, Stiller, G P, Bernath, P, Schrems, O, Kuellmann, H, Raspollini, P, Lambert, A, McConnell, J, kittippurath, J, Semeniuk, K, Toohey, M, Ridolfi, M, and Notholt, Justus
- Abstract
The Atmospheric Chemistry Experiment (ACE), also known as SCISAT, was launched on 12 August 2003,carrying two instruments that measure vertical profiles of atmospheric constituents using the solar occultation technique.One of these instruments, the ACE Fourier Transform Spectrometer (ACE-FTS), is measuring volume mixing ratio profiles of nitrous oxide (N2O) from the upper troposphere to the lower mesosphere. In this study, the quality of the ACE-FTS version 2.2 N2O data is assessed rough comparisons with coincident measurements made by other satellite, balloon-borne, aircraft, and ground-based instruments.These consist of vertical profile comparisons with the SMR, MLS, and MIPAS satellite instruments, multiple aircraft flights of ASUR, and single balloon flights of SPIRALE and FIRS-2, and artial column comparisons with a network of ground-based Fourier Transform InfraRed spectrometers(FTIRs). Overall, the quality of the ACE-FTS version 2.2 N2O VMR profiles appears to be good over the entire altitude range from 5 to 60 km. Between 6 and 30 km, the meanabsolute differences for the satellite comparisons lie between -42 ppbv and +17 ppbv, with most within 20 ppbv, correspondingto relative deviations from the mean that are mostly within 5%. Between 18 and 30 km, the mean absolute differences are generally within 10 ppbv, with relative deviations from the mean within 20%, except for the aircraft and balloon comparisons. From 30 to 60 km, the mean absolute differences are within 4 ppbv, and are mostly between -2 and +1 ppbv. Given the small N2O VMR in this region, therelative deviations from the mean are therefore large at these altitudes, with most suggesting a negative bias in the ACEFTS data between 30 and 50 km. In the comparisons with the FTIRs, the mean relative differences between the ACE-FTS and FTIR partial columns are within 6.6% for eleven of thetwelve contributing stations. This mean relative difference is negative at eight stations, suggesting a small negative
- Published
- 2008
39. Trend analysis of greenhouse gases over Europe measured by a network of ground-based remote FTIR instruments
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Gardiner, T, Forbes, A, De Maziere, M, Vigouroux, C, Mahieu, E, Demoulin, P, Velazco, Voltaire A, Notholt, J, Blumenstock, T, Hase, F, Kramer, I, Sussmann, R, Stremme, W, Mellqvist, J, Strandberg, A, Ellingsen, K, Gauss, M, Gardiner, T, Forbes, A, De Maziere, M, Vigouroux, C, Mahieu, E, Demoulin, P, Velazco, Voltaire A, Notholt, J, Blumenstock, T, Hase, F, Kramer, I, Sussmann, R, Stremme, W, Mellqvist, J, Strandberg, A, Ellingsen, K, and Gauss, M
- Abstract
This paper describes the statistical analysis of annual trends in long term datasets of greenhouse gas measurements taken over ten or more years. The analysis technique employs a bootstrap resampling method to determine both the long-term and intra-annual variability of the datasets, together with the uncertainties on the trend values.
- Published
- 2008
40. Evaluation of tropospheric and stratospheric ozone trends over Western Europe from ground-based FTIR network observations
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Vigouroux, C, De Maziere, M, Demoulin, P, Servais, C, Hase, F, Blumenstock, T, Kramer, I, Schneider, M, Mellqvist, J, Strandberg, A, Velazco, Voltaire A, Notholt, J, Sussmann, R, Stremme, W, Rockmann, A, Gardiner, T, Coleman, M, Woods, P, Vigouroux, C, De Maziere, M, Demoulin, P, Servais, C, Hase, F, Blumenstock, T, Kramer, I, Schneider, M, Mellqvist, J, Strandberg, A, Velazco, Voltaire A, Notholt, J, Sussmann, R, Stremme, W, Rockmann, A, Gardiner, T, Coleman, M, and Woods, P
- Abstract
Within the European project UFTIR (Time series of Upper Free Troposphere observations from an European ground-based FTIR network), six ground-based stations in Western Europe, from 79° N to 28° N, all equipped with Fourier Transform infrared (FTIR) instruments and part of the Network for the Detection of Atmospheric Composition Change (NDACC), have joined their efforts to evaluate the trends of several direct and indirect greenhouse gases over the period 1995–2004. The retrievals of CO, CH4, C2H6, N2O, CHClF2, and O3 have been optimized. Using the optimal estimation method, some vertical information can be obtained in addition to total column amounts. A bootstrap resampling method has been implemented to determine annual partial and total column trends for the target gases. The present work focuses on the ozone results. The retrieved time series of partial and total ozone columns are validated with ground-based correlative data (Brewer, Dobson, UV-Vis, ozonesondes, and Lidar). The observed total column ozone trends are in agreement with previous studies: 1) no total column ozone trend is seen at the lowest latitude station Izaña (28° N); 2) slightly positive total column trends are seen at the two mid-latitude stations Zugspitze and Jungfraujoch (47° N), only one of them being significant; 3) the highest latitude stations Harestua (60° N), Kiruna (68° N) and Ny-Ålesund (79° N) show significant positive total column trends. Following the vertical information contained in the ozone FTIR retrievals, we provide partial columns trends for the layers: ground-10 km, 10–18 km, 18–27 km, and 27–42 km, which helps to distinguish the contributions from dynamical and chemical changes on the total column ozone trends. We obtain no statistically significant trends in the ground-10 km layer for five out of the six ground-based stations. We find significant positive trends for the lowermost stratosphere at the two mid-latitude stations, and at Ny-Ålesund. We find smaller, but signi
- Published
- 2008
41. Measurements of air pollution emission factors for marine transportation in SECA
- Author
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Alföldy, B., primary, Lööv, J. B., additional, Lagler, F., additional, Mellqvist, J., additional, Berg, N., additional, Beecken, J., additional, Weststrate, H., additional, Duyzer, J., additional, Bencs, L., additional, Horemans, B., additional, Cavalli, F., additional, Putaud, J.-P., additional, Janssens-Maenhout, G., additional, Csordás, A. P., additional, Van Grieken, R., additional, Borowiak, A., additional, and Hjorth, J., additional
- Published
- 2013
- Full Text
- View/download PDF
42. Validation of MIPAS ClONO2 measurements
- Author
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Hopfner, M, von Clarmann, T, Jones, Nicholas B, Griffith, David W, Toon, G C, Mahieu, E, Zander, R, Wood, S, Blumenstock, T, Hannigan, J, Coffey, M, Hase, F, Fischer, H W, Mellqvist, J, Strandberg, A, Warneke, Thorsten, Blom, C E, Piesch, C, Jucks, K W, Chance, K, Kouker, W, Reddmann, T, Boone, C, Oelhaf, H, Keim, C, Glatthor, N, Kiefer, M, Kellmann, S, Ruhnke, R, Linden, A, Liu, G Y, Funke, B, Milz, M, Schneider, M, Wetzel, G, Steck, T, Kleinert, A, Mikuteit, S, Stiller, G P, Grabowski, U, Walker, K A, Bernath, P, Friedl-Vallon, F, Notholt, Justus, Hopfner, M, von Clarmann, T, Jones, Nicholas B, Griffith, David W, Toon, G C, Mahieu, E, Zander, R, Wood, S, Blumenstock, T, Hannigan, J, Coffey, M, Hase, F, Fischer, H W, Mellqvist, J, Strandberg, A, Warneke, Thorsten, Blom, C E, Piesch, C, Jucks, K W, Chance, K, Kouker, W, Reddmann, T, Boone, C, Oelhaf, H, Keim, C, Glatthor, N, Kiefer, M, Kellmann, S, Ruhnke, R, Linden, A, Liu, G Y, Funke, B, Milz, M, Schneider, M, Wetzel, G, Steck, T, Kleinert, A, Mikuteit, S, Stiller, G P, Grabowski, U, Walker, K A, Bernath, P, Friedl-Vallon, F, and Notholt, Justus
- Abstract
Altitude profiles of ClONO2 retrieved with the IMK (Institut fur Meteorologie und Klimaforschung) science-oriented data processor from MIPAS/Envisat (Michelson Interferometer for Passive Atmospheric Sounding on Envisat) mid-infrared limb emission measurements between July 2002 and March 2004 have been validated by comparison with balloon-borne (Mark IV, FIRS2, MIPASB), airborne (MIPAS-STR), ground-based (Spitsbergen, Thule, Kiruna, Harestua, Jungfraujoch, Izana, Wollongong, Lauder), and spaceborne (ACE-FTS) observations. With few exceptions we found very good agreement between these instruments and MIPAS with no evidence for any bias in most cases and altitude regions. For balloon-borne measurements typical absolute mean differences are below 0.05 ppbv over the whole altitude range from 10 to 39 km. In case of ACE-FTS observations mean differences are below 0.03 ppbv for observations below 26 km. Above this altitude the comparison with ACE-FTS is affected by the photochemically induced diurnal variation of ClONO2. Correction for this by use of a chemical transport model led to an overcompensation of the photochemical effect by up to 0.1 ppbv at altitudes of 30–35 km in case of MIPAS-ACEFTS comparisons while for the balloon-borne observations no such inconsistency has been detected. The comparison of MIPAS derived total column amounts with ground-based observations revealed no significant bias in the MIPAS data. Mean differences between MIPAS and FTIR column abundances are 0.11±0.12×10^14 cm^−2 (1.0±1.1%) and −0.09±0.19×10^14 cm^−2 (−0.8±1.7%), depending on the coincidence criterion applied. Χ^2 tests have been performed to assess the combined precision estimates of MIPAS and the related instruments. When no exact coincidences were available as in case of MIPAS – FTIR or MIPAS – ACE-FTS comparisons it has been necessary to take into consideration a coincidence error term to account for χ^2 deviations. From the resulting χ2 profiles there is no evidence for a systemat
- Published
- 2007
43. Validation of WFM-DOAS V0.6 CO and V1.0 CH4 scientific products using European ground-based FTIR measurements
- Author
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Dils, B, De Maziere, M, Blumenstock, T, Hase, F, Kramer, I, Mahieu, E, Demoulin, P, Duchatelet, P, Mellqvist, J, Strandberg, A, Buchwitz, M, Khlystova, I, Schneising, O, Velazco, Voltaire A, Notholt, Justus, Sussmann, R, Stremme, W, Dils, B, De Maziere, M, Blumenstock, T, Hase, F, Kramer, I, Mahieu, E, Demoulin, P, Duchatelet, P, Mellqvist, J, Strandberg, A, Buchwitz, M, Khlystova, I, Schneising, O, Velazco, Voltaire A, Notholt, Justus, Sussmann, R, and Stremme, W
- Published
- 2007
44. Measurements of air pollution emission factors for marine transportation
- Author
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Alföldy, B., primary, Balzani Lööv, J., additional, Lagler, F., additional, Mellqvist, J., additional, Berg, N., additional, Beecken, J., additional, Weststrate, H., additional, Duyzer, J., additional, Bencs, L., additional, Horemans, B., additional, Cavalli, F., additional, Putaud, J.-P., additional, Janssens-Maenhout, G., additional, Pintér Csordás, A., additional, Van Grieken, R., additional, Borowiak, A., additional, and Hjorth, J., additional
- Published
- 2012
- Full Text
- View/download PDF
45. Comparisons between SCIAMACHY and ground-based FTIR data for total columns of CO, CH4, CO2 and N2O
- Author
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Dils, B, De Maziere, M, Muller, J F, Blumenstock, T, Jones, Nicholas B, Griffith, David W, Rinsland, C P, Mahieu, E, Wood, S, de Beek, R, Demoulin, P, Buchwitz, M, Duchatelet, P, Frankenberg, C, Gloudemans, A, Kerzenmacher, T, Kramer, I, Mellqvist, J, Shrijver, H, Strandberg, A, Smale, D, Stremme, W, Straume, A G, Sussmann, R, van den Broek, M, Wagner, T, Strong, K, Wiacek, Aldona, Taylor, J R, Fast, Hans, Warneke, Thorsten, MITTERMEIER, Richard L, Notholt, Justus, Velazco, Voltaire A, Dils, B, De Maziere, M, Muller, J F, Blumenstock, T, Jones, Nicholas B, Griffith, David W, Rinsland, C P, Mahieu, E, Wood, S, de Beek, R, Demoulin, P, Buchwitz, M, Duchatelet, P, Frankenberg, C, Gloudemans, A, Kerzenmacher, T, Kramer, I, Mellqvist, J, Shrijver, H, Strandberg, A, Smale, D, Stremme, W, Straume, A G, Sussmann, R, van den Broek, M, Wagner, T, Strong, K, Wiacek, Aldona, Taylor, J R, Fast, Hans, Warneke, Thorsten, MITTERMEIER, Richard L, Notholt, Justus, and Velazco, Voltaire A
- Abstract
Total column amounts of CO, CH4, CO2 and N2O retrieved from SCIAMACHY nadir observations in its near-infrared channels have been compared to data from a ground-based quasi-global network of Fourier-transform infrared (FTIR) spectrometers. The SCIAMACHY data considered here have been produced by three different retrieval algorithms, WFM-DOAS (version 0.5 for CO and CH4 and version 0.4 for CO2 and N2O), IMAP-DOAS (version 1.1 and 0.9 (for CO)) and IMLM (version 6.3) and cover the January to December 2003 time period. Comparisons have been made for individual data, as well as for monthly averages. To maximize the number of reliable coincidences that satisfy the temporal and spatial collocation criteria, the SCIAMACHY data have been compared with a temporal 3rd order polynomial interpolation of the ground-based data. Particular attention has been given to the question whether SCIAMACHY observes correctly the seasonal and latitudinal variability of the target species. The present results indicate that the individual SCIAMACHY data obtained with the actual versions of the algorithms have been significantly improved, but that the quality requirements, for estimating emissions on regional scales, are not yet met. Nevertheless, possible directions for further algorithm upgrades have been identified which should result in more reliable data products in a near future.
- Published
- 2006
46. Increased Nothern Hemispheric carbon monoxide burden in the troposphere in 2002 and 2003 detected from the ground and from space
- Author
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Yurganov, L. N., Duchatelet, P., Dzhola, A. V., Edwards, D. P., Hase, F., Kramer, I., Mahieu, E., Mellqvist, J., Notholt, Justus, Novelli, P. C., Rockmann, A., Scheel, H. E., Schneider, M., Schulz, Astrid, Strandberg, A., Sussmann, R., Tanimoto, H., Velazco, V., Drummond, J. R., Gille, J. C., Yurganov, L. N., Duchatelet, P., Dzhola, A. V., Edwards, D. P., Hase, F., Kramer, I., Mahieu, E., Mellqvist, J., Notholt, Justus, Novelli, P. C., Rockmann, A., Scheel, H. E., Schneider, M., Schulz, Astrid, Strandberg, A., Sussmann, R., Tanimoto, H., Velazco, V., Drummond, J. R., and Gille, J. C.
- Published
- 2005
47. Increased Northern Hemispheric carbon monoxide burden in the troposphere in 2002 and 2003 detected from the ground and from space
- Author
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Yurganov, L N, Duchatelet, P, Dzhola, A V, Edwards, D P, Hase, F, Kramer, I, Mahieu, E, Mellqvist, J, Notholt, J, Novelli, P C, Rockmann, A, Scheel, H E, Schneider, M, Schulz, A, Strandberg, A, Sussmann, R, Tanimoto, H, Velazco, Voltaire A, Drummond, J, Gille, J, Yurganov, L N, Duchatelet, P, Dzhola, A V, Edwards, D P, Hase, F, Kramer, I, Mahieu, E, Mellqvist, J, Notholt, J, Novelli, P C, Rockmann, A, Scheel, H E, Schneider, M, Schulz, A, Strandberg, A, Sussmann, R, Tanimoto, H, Velazco, Voltaire A, Drummond, J, and Gille, J
- Abstract
Carbon monoxide total column amounts in the atmosphere have been measured in the High Northern Hemisphere (30°- 90° N, HNH) between January 2002 and December 2003 using infrared spectrometers of high and moderate resolution and the Sun as a light source. They were compared to ground-level CO mixing ratios and to total column amounts measured from space by the Terra/MOPITT instrument. All these data reveal increased CO abundances in 2002-2003 in comparison to the unperturbed 2000-2001 period. Maximum anomalies were observed in September 2002 and August 2003. Using a simple two-box model, the corresponding annual CO emission anomalies (referenced to 2000-2001 period) have been found equal to 95Tg in 2002 and 130Tg in 2003, thus close to those for 1996 and 1998. A good correlation with hot spots detected by a satellite radiometer allows one to assume strong boreal forest fires, occurred mainly in Russia, as a source of the increased CO burdens.
- Published
- 2005
48. The exploitation of ground-based fourier transform infrared observations for the evaluation of tropospheric trends of greenhouse gases over Europe
- Author
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De Maziere, M., Rockmann, A., Vigouroux, C., Gardiner, T., Coleman, M., Woods, P., Ellingsen, K., Gauss, M., Lsaksen, I., Blumenstock, T., Hase, F., Kramer, I., Camy-Peyret, C., Chelin, P., Mahieu, E., Demoulin, P., Duchatelet, P., Mellqvist, J., Strandberg, A., Velazco, Voltaire A, Notholt, Justus, Sussmann, R., Stremme, W., De Maziere, M., Rockmann, A., Vigouroux, C., Gardiner, T., Coleman, M., Woods, P., Ellingsen, K., Gauss, M., Lsaksen, I., Blumenstock, T., Hase, F., Kramer, I., Camy-Peyret, C., Chelin, P., Mahieu, E., Demoulin, P., Duchatelet, P., Mellqvist, J., Strandberg, A., Velazco, Voltaire A, Notholt, Justus, Sussmann, R., and Stremme, W.
- Published
- 2005
49. Ship emissions of SO<sub>2</sub> and NO<sub>2</sub>: DOAS measurements from airborne platforms
- Author
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Berg, N., primary, Mellqvist, J., additional, Jalkanen, J.-P., additional, and Balzani, J., additional
- Published
- 2012
- Full Text
- View/download PDF
50. Primary and secondary sources of formaldehyde in urban atmospheres: Houston Texas region
- Author
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Parrish, D. D., primary, Ryerson, T. B., additional, Mellqvist, J., additional, Johansson, J., additional, Fried, A., additional, Richter, D., additional, Walega, J. G., additional, Washenfelder, R. A., additional, de Gouw, J. A., additional, Peischl, J., additional, Aikin, K. C., additional, McKeen, S. A., additional, Frost, G. J., additional, Fehsenfeld, F. C., additional, and Herndon, S. C., additional
- Published
- 2012
- Full Text
- View/download PDF
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