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23 results on '"Swart, Daan P. J."'

1. Long-Term Monitoring of the Stratosphere by Lidars in the Network for the Detection of Atmospheric Composition Change

Author

Steinbrecht, Wolfgang, Leblanc, Thierry, Godin-Beekmann, Sophie, Khaykin, Sergey M., Hauchecorne, Alain, Keckhut, Philippe, Querel, Richard, Swart, Daan P. J., McGee, Thomas J., Sullivan, John T., editor, Leblanc, Thierry, editor, Tucker, Sara, editor, Demoz, Belay, editor, Eloranta, Edwin, editor, Hostetler, Chris, editor, Ishii, Shoken, editor, Mona, Lucia, editor, Moshary, Fred, editor, Papayannis, Alexandros, editor, and Rupavatharam, Krishna, editor

Published
2023
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3. Widespread Pesticide Distribution in the European Atmosphere Questions their Degradability in Air

Author

Mayer, Ludovic, primary, Degrendele, Céline, additional, Šenk, Petr, additional, Kohoutek, Jiři, additional, Přibylová, Petra, additional, Kukučka, Petr, additional, Melymuk, Lisa, additional, Durand, Amandine, additional, Ravier, Sylvain, additional, Alastuey, Andres, additional, Baker, Alex R., additional, Baltensperger, Urs, additional, Baumann-Stanzer, Kathrin, additional, Biermann, Tobias, additional, Bohlin-Nizzetto, Pernilla, additional, Ceburnis, Darius, additional, Conil, Sébastien, additional, Couret, Cédric, additional, Degórska, Anna, additional, Diapouli, Evangelia, additional, Eckhardt, Sabine, additional, Eleftheriadis, Konstantinos, additional, Forster, Grant L., additional, Freier, Korbinian, additional, Gheusi, François, additional, Gini, Maria I., additional, Hellén, Heidi, additional, Henne, Stephan, additional, Herrmann, Hartmut, additional, Holubová Šmejkalová, Adéla, additional, Hõrrak, Urmas, additional, Hüglin, Christoph, additional, Junninen, Heikki, additional, Kristensson, Adam, additional, Langrene, Laurent, additional, Levula, Janne, additional, Lothon, Marie, additional, Ludewig, Elke, additional, Makkonen, Ulla, additional, Matejovičová, Jana, additional, Mihalopoulos, Nikolaos, additional, Mináriková, Veronika, additional, Moche, Wolfgang, additional, Noe, Steffen M., additional, Pérez, Noemí, additional, Petäjä, Tuukka, additional, Pont, Véronique, additional, Poulain, Laurent, additional, Quivet, Etienne, additional, Ratz, Gabriela, additional, Rehm, Till, additional, Reimann, Stefan, additional, Simmons, Ivan, additional, Sonke, Jeroen E., additional, Sorribas, Mar, additional, Spoor, Ronald, additional, Swart, Daan P. J., additional, Vasilatou, Vasiliki, additional, Wortham, Henri, additional, Yela, Margarita, additional, Zarmpas, Pavlos, additional, Zellweger Fäsi, Claudia, additional, Tørseth, Kjetil, additional, Laj, Paolo, additional, Klánová, Jana, additional, and Lammel, Gerhard, additional

Published
2024
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4. Widespread pesticide distribution in the European atmosphere questions their degradability in air

Author

Mayer, Ludovic, Degrendele, Céline, Šenk, Petr, Kohoutek, Jiři, Přibylová, Petra, Kukučka, Petr, Melymuk, Lisa, Durand, Amandine, Ravier, Sylvain, Alastuey, Andres, Baker, Alex R., Baltensperger, Urs, Baumann-Stanzer, Kathrin, Biermann, Tobias, Bohlin-Nizzetto, Pernilla, Ceburnis, Darius, Conil, Sébastien, Couret, Cédric, Degórska, Anna, Diapouli, Evangelia, Eckhardt, Sabine, Eleftheriadis, Konstantinos, Forster, Grant L., Freier, Korbinian, Gheusi, François, Gini, Maria I., Hellén, Heidi, Henne, Stephan, Herrmann, Hartmut, Holubová Šmejkalová, Adéla, Hõrrak, Urmas, Hüglin, Christoph, Junninen, Heikki, Kristensson, Adam, Langrene, Laurent, Levula, Janne, Lothon, Marie, Ludewig, Elke, Makkonen, Ulla, Matejovičová, Jana, Mihalopoulos, Nikolaos, Mináriková, Veronika, Moche, Wolfgang, Noe, Steffen M., Pérez, Noemí, Petäjä, Tuukka, Pont, Véronique, Poulain, Laurent, Quivet, Etienne, Ratz, Gabriela, Rehm, Till, Reimann, Stefan, Simmons, Ivan, Sonke, Jeroen E., Sorribas, Mar, Spoor, Ronald, Swart, Daan P. J., Vasilatou, Vasiliki, Wortham, Henri, Yela, Margarita, Zarmpas, Pavlos, Zellweger Fäsi, Claudia, Tørseth, Kjetil, Laj, Paolo, Klánová, Jana, Lammel, Gerhard, Mayer, Ludovic, Degrendele, Céline, Šenk, Petr, Kohoutek, Jiři, Přibylová, Petra, Kukučka, Petr, Melymuk, Lisa, Durand, Amandine, Ravier, Sylvain, Alastuey, Andres, Baker, Alex R., Baltensperger, Urs, Baumann-Stanzer, Kathrin, Biermann, Tobias, Bohlin-Nizzetto, Pernilla, Ceburnis, Darius, Conil, Sébastien, Couret, Cédric, Degórska, Anna, Diapouli, Evangelia, Eckhardt, Sabine, Eleftheriadis, Konstantinos, Forster, Grant L., Freier, Korbinian, Gheusi, François, Gini, Maria I., Hellén, Heidi, Henne, Stephan, Herrmann, Hartmut, Holubová Šmejkalová, Adéla, Hõrrak, Urmas, Hüglin, Christoph, Junninen, Heikki, Kristensson, Adam, Langrene, Laurent, Levula, Janne, Lothon, Marie, Ludewig, Elke, Makkonen, Ulla, Matejovičová, Jana, Mihalopoulos, Nikolaos, Mináriková, Veronika, Moche, Wolfgang, Noe, Steffen M., Pérez, Noemí, Petäjä, Tuukka, Pont, Véronique, Poulain, Laurent, Quivet, Etienne, Ratz, Gabriela, Rehm, Till, Reimann, Stefan, Simmons, Ivan, Sonke, Jeroen E., Sorribas, Mar, Spoor, Ronald, Swart, Daan P. J., Vasilatou, Vasiliki, Wortham, Henri, Yela, Margarita, Zarmpas, Pavlos, Zellweger Fäsi, Claudia, Tørseth, Kjetil, Laj, Paolo, Klánová, Jana, and Lammel, Gerhard

Abstract

Risk assessment of pesticide impacts on remote ecosystems makes use of model-estimated degradation in air. Recent studies suggest these degradation rates to be overestimated, questioning current pesticide regulation. Here, we investigated the concentrations of 76 pesticides in Europe at 29 rural, coastal, mountain, and polar sites during the agricultural application season. Overall, 58 pesticides were observed in the European atmosphere. Low spatial variation of 7 pesticides suggests continental-scale atmospheric dispersal. Based on concentrations in free tropospheric air and at Arctic sites, 22 pesticides were identified to be prone to long-range atmospheric transport, which included 15 substances approved for agricultural use in Europe and 7 banned ones. Comparison between concentrations at remote sites and those found at pesticide source areas suggests long atmospheric lifetimes of atrazine, cyprodinil, spiroxamine, tebuconazole, terbuthylazine, and thiacloprid. In general, our findings suggest that atmospheric transport and persistence of pesticides have been underestimated and that their risk assessment needs to be improved.

Published
2024

5. Widespread Pesticide Distribution in the European Atmosphere Questions their Degradability in Air

Author

0000-0002-6049-0860, 0000-0002-5453-5495, 0000-0003-0231-5324, 0000-0003-2265-4905, 0000-0001-7022-3857, 0000-0001-7146-3035, 0000-0003-2313-0628, Mayer, Ludovic, Degrendele, Céline, Šenk, Petr, Kohoutek, Jiři, Přibylová, Petra, Kukučka, Petr, Melymuk, Lisa, Durand, Amandine, Ravier, Sylvain, Alastuey, Andrés, Baker, Alex R., Baltensperger, Urs, Baumann-Stanzer, Kathrin, Biermann, Tobias, Bohlin-Nizzetto, Pernilla, Ceburnis, Darius, Conil, Sébastien, Couret, Cédric, Degórska, Anna, Diapouli, Evangelia, Eckhardt, Sabine, Eleftheriadis, Konstantinos, Forster, Grant L., Freier, Korbinian, Gheusi, François, Gini, Maria I., Hellén, Heidi, Henne, Stephan, Herrmann, Hartmut, Holubová Šmejkalová, Adéla, Hõrrak, Urmas, Hüglin, Christoph, Junninen, Heikki, Kristensson, Adam, Langrene, Laurent, Levula, Janne, Lothon, Marie, Ludewig, Elke, Makkonen, Ulla, Matejovičová, Jana, Mihalopoulos, Nikolaos, Mináriková, Veronika, Moche, Wolfgang, Noe, Steffen M., Pérez, Noemí, Petäjä, Tuukka, Pont, Véronique, Poulain, Laurent, Quivet, Etienne, Ratz, Gabriela, Rehm, Till, Reimann, Stefan, Simmons, Ivan, Sonke, Jeroen E., Sorribas, Mar, Spoor, Ronald, Swart, Daan P. J., Vasilatou, Vasiliki, Wortham, Henri, Yela, Margarita, Zarmpas, Pavlos, Zellweger Fäsi, Claudia, Tørseth, Kjetil, Laj, Paolo, Klánová, Jana, Lammel, Gerhard, 0000-0002-6049-0860, 0000-0002-5453-5495, 0000-0003-0231-5324, 0000-0003-2265-4905, 0000-0001-7022-3857, 0000-0001-7146-3035, 0000-0003-2313-0628, Mayer, Ludovic, Degrendele, Céline, Šenk, Petr, Kohoutek, Jiři, Přibylová, Petra, Kukučka, Petr, Melymuk, Lisa, Durand, Amandine, Ravier, Sylvain, Alastuey, Andrés, Baker, Alex R., Baltensperger, Urs, Baumann-Stanzer, Kathrin, Biermann, Tobias, Bohlin-Nizzetto, Pernilla, Ceburnis, Darius, Conil, Sébastien, Couret, Cédric, Degórska, Anna, Diapouli, Evangelia, Eckhardt, Sabine, Eleftheriadis, Konstantinos, Forster, Grant L., Freier, Korbinian, Gheusi, François, Gini, Maria I., Hellén, Heidi, Henne, Stephan, Herrmann, Hartmut, Holubová Šmejkalová, Adéla, Hõrrak, Urmas, Hüglin, Christoph, Junninen, Heikki, Kristensson, Adam, Langrene, Laurent, Levula, Janne, Lothon, Marie, Ludewig, Elke, Makkonen, Ulla, Matejovičová, Jana, Mihalopoulos, Nikolaos, Mináriková, Veronika, Moche, Wolfgang, Noe, Steffen M., Pérez, Noemí, Petäjä, Tuukka, Pont, Véronique, Poulain, Laurent, Quivet, Etienne, Ratz, Gabriela, Rehm, Till, Reimann, Stefan, Simmons, Ivan, Sonke, Jeroen E., Sorribas, Mar, Spoor, Ronald, Swart, Daan P. J., Vasilatou, Vasiliki, Wortham, Henri, Yela, Margarita, Zarmpas, Pavlos, Zellweger Fäsi, Claudia, Tørseth, Kjetil, Laj, Paolo, Klánová, Jana, and Lammel, Gerhard

Abstract

Risk assessment of pesticide impacts on remote ecosystems makes use of model-estimated degradation in air. Recent studies suggest these degradation rates to be overestimated, questioning current pesticide regulation. Here, we investigated the concentrations of 76 pesticides in Europe at 29 rural, coastal, mountain, and polar sites during the agricultural application season. Overall, 58 pesticides were observed in the European atmosphere. Low spatial variation of 7 pesticides suggests continental-scale atmospheric dispersal. Based on concentrations in free tropospheric air and at Arctic sites, 22 pesticides were identified to be prone to long-range atmospheric transport, which included 15 substances approved for agricultural use in Europe and 7 banned ones. Comparison between concentrations at remote sites and those found at pesticide source areas suggests long atmospheric lifetimes of atrazine, cyprodinil, spiroxamine, tebuconazole, terbuthylazine, and thiacloprid. In general, our findings suggest that atmospheric transport and persistence of pesticides have been underestimated and that their risk assessment needs to be improved.

Published
2024

7. How Certain are We of the Uncertainties in Recent Ozone Profile Trend Assessments of Merged Limbo Ccultation Records? Challenges and Possible Ways Forward

Author

Hubert, Daan, Lambert, Jean-Christopher, Verhoelst, Tijl, Granville, Jose, Keppens, Arno, Baray, Jean-Luc, Cortesi, Ugo, Degenstein, D. A, Froidevaux, Lucien, Godin-Beekmann, Sophie, Hoppel, Karl, Kyrola, Erkki T, Leblanc, Thierry, Lichtenberg, Gunter, McElroy, Charles T, Murtagh, Donal P, Russell, James M., III, Salvador, Jacobo, Smit, Herman G. J, Stebel, Kerstin, Steinbrecht, Wolfgang, Strawbridge, K. B, Stubi, Rene, Swart, Daan P. J, Taha, Ghassan, Thompson, Anne M, Urban, Joachim, Van Gijsel, Anne, Von Der Gathen, Peter, Walker, Kaley Ann, Wolfram, Elian, Zawodny, Joseph M, and Nakane, Hideaki

Subjects
Meteorology And Climatology
Abstract

Most recent assessments of long-term changes in the vertical distribution of ozone (by e.g. WMO and SI2N) rely on data sets that integrate observations by multiple instruments. Several merged satellite ozone profile records have been developed over the past few years; each considers a particular set of instruments and adopts a particular merging strategy. Their intercomparison by Tummon et al. revealed that the current merging schemes are not sufficiently refined to correct for all major differences between the limb/occultation records. This shortcoming introduces uncertainties that need to be known to obtain a sound interpretation of the different satellite-based trend studies. In practice however, producing realistic uncertainty estimates is an intricate task which depends on a sufficiently detailed understanding of the characteristics of each contributing data record and on the subsequent interplay and propagation of these through the merging scheme. Our presentation discusses these challenges in the context of limb/occultation ozone profile records, but they are equally relevant for other instruments and atmospheric measurements. We start by showing how the NDACC and GAW-affiliated ground-based networks of ozonesonde and lidar instruments allowed us to characterize fourteen limb/occultation ozone profile records, together providing a global view over the last three decades. Our prime focus will be on techniques to estimate long-term drift since our results suggest this is the main driver of the major trend differences between the merged data sets. The single-instrument drift estimates are then used for a tentative estimate of the systematic uncertainty in the profile trends from merged data records. We conclude by reflecting on possible further steps needed to improve the merging algorithms and to obtain a better characterization of the uncertainties involved.

Published
2015

8. Possible Effects of Greenhouse Gases to Ozone Profiles and DNA Active UV-B Irradiance at Ground Level

Author

Eleftheratos, Kostas, primary, Kapsomenakis, John, additional, Zerefos, Christos S., additional, Bais, Alkiviadis F., additional, Fountoulakis, Ilias, additional, Dameris, Martin, additional, Jöckel, Patrick, additional, Haslerud, Amund S., additional, Godin-Beekmann, Sophie, additional, Steinbrecht, Wolfgang, additional, Petropavlovskikh, Irina, additional, Brogniez, Colette, additional, Leblanc, Thierry, additional, Liley, J. Ben, additional, Querel, Richard, additional, and Swart, Daan P. J., additional

Published
2020
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9. Ozone differential absorption lidar algorithm intercomparison

Author

Godin, Sophie, Carswell, Allen I., Donovan, David P., Claude, Hans, Steinbrecht, Wolfgang, McDermid, I. Stuart, McGee, Thomas J., Gross, Michael R., Nakane, Hideaki, Swart, Daan P. J., Bergwerff, Hans B., Uchino, Osamu, Gathen, Peter von der, and Neuber, Roland

Subjects
Ozone -- Research, Optical radar -- Usage, Stratosphere -- Research, Astronomy, Physics
Abstract

An intercomparison of ozone differential absorption lidar algorithms was performed in 1996 within the framework of the Network for the Detection of Stratospheric Changes (NDSC) lidar working group. The objective of this research was mainly to test the differentiating techniques used by the various lidar teams involved in the NDSC for the calculation of the ozone number density from the lidar signals. The exercise consisted of processing synthetic lidar signals computed from simple Rayleigh scattering and three initial ozone profiles. Two of these profiles contained perturbations in the low and the high stratosphere to test the vertical resolution of the various algorithms. For the unperturbed profiles the results of the simulations show the correct behavior of the lidar processing methods in the low and the middle stratosphere with biases of less than 1% with respect to the initial profile to as high as 30 km in most cases. In the upper stratosphere, significant biases reaching 10% at 45 km for most of the algorithms are obtained. This bias is due to the decrease in the signal-to-noise ratio with altitude, which makes it necessary to increase the number of points of the derivative low-pass filter used for data processing. As a consequence the response of the various retrieval algorithms to perturbations in the ozone profile is much better in the lower stratosphere than in the higher range. These results show the necessity of limiting the vertical smoothing in the ozone lidar retrieval algorithm and questions the ability of current lidar systems to detect long-term ozone trends above 40 km. Otherwise the simulations show in general a correct estimation of the ozone profile random error and, as shown by the tests involving the perturbed ozone profiles, some inconsistency in the estimation of the vertical resolution among the lidar teams involved in this experiment.

Published
1999

10. On the Long-term Stability of Satellite and Ground-based Ozone Profile Records

Author

Hubert, Daan, Lambert, Jean-Christopher, Verhoelst, Tijl, Keppens, Arno, Granville, José, Bhartia, Pawan K., Bourassa, Adam E., Damadeo, Robert, Degenstein, Doug A., Froidevaux, Lucien, Godin-Beekmann, Sophie, Johnson, Bryan J., Kaempfer, Niklaus, Leblanc, Thierry, Lichtenberg, Günter, Murtagh, Donal P., Maillard Barras, Eliane, Nakane, Hideaki, Nedoluha, Gerald, Portafaix, Thierry, Querel, Richard, Raspollini, Piera, Russell, James-M., Salvador, J., Smit, Herman G. J., Sofieva, Viktoria, Stebel, Kerstin, Steinbrecht, Wolfgang, Stübi, René, Swart, Daan P. J., Tarasick, David W., Thompson, Anne M., van Malderen, Roeland, von Clarmann, Thomas, von Der Gathen, Peter, Walker, Kaley A., Weber, Mark, Witte, Jacquelyn C., Elian, Wolfram, Zawodny, Joseph M., Belgian Institute for Space Aeronomy / Institut d'Aéronomie Spatiale de Belgique (BIRA-IASB), NASA Goddard Space Flight Center (GSFC), Institute of Space and Atmospheric Studies [Saskatoon] (ISAS), Department of Physics and Engineering Physics [Saskatoon], University of Saskatchewan [Saskatoon] (U of S)-University of Saskatchewan [Saskatoon] (U of S), NASA Langley Research Center [Hampton] (LaRC), Jet Propulsion Laboratory (JPL), NASA-California Institute of Technology (CALTECH), 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), National Oceanic and Atmospheric Administration (NOAA), Oeschger Centre for Climate Change Research (OCCR), University of Bern, DLR Institut für Methodik der Fernerkundung / DLR Remote Sensing Technology Institute (IMF), Deutsches Zentrum für Luft- und Raumfahrt [Oberpfaffenhofen-Wessling] (DLR), Chalmers University of Technology [Göteborg], Federal Office of Meteorology and Climatology MeteoSwiss, National Institute for Environmental Studies (NIES), Naval Research Laboratory (NRL), Laboratoire de l'Atmosphère et des Cyclones (LACy), Institut national des sciences de l'Univers (INSU - CNRS)-Université de La Réunion (UR)-Centre National de la Recherche Scientifique (CNRS)-Météo-France, National Institute of Water and Atmospheric Research [Lauder] (NIWA), Istituto di Fisica Applicata 'Nello Carrara' (IFAC), National Research Council of Italy | Consiglio Nazionale delle Ricerche (CNR), Center for Atmospheric Sciences [Hampton] (CAS), Hampton University, Centro de Investigaciones en Láseres y Aplicaciones [Buenos Aires] (CEILAP), Consejo Nacional de Investigaciones Científicas y Técnicas [Buenos Aires] (CONICET)-Instituto de Investigaciones Científicas y Técnicas para la Defensa (CITEDEF), Forschungszentrum Jülich GmbH | Centre de recherche de Juliers, Helmholtz-Gemeinschaft = Helmholtz Association, Finnish Meteorological Institute (FMI), Norwegian Institute for Air Research (NILU), Meteorologisches Observatorium Hohenpeißenberg (MOHp), Deutscher Wetterdienst [Offenbach] (DWD), Payerne Aerological Station, National Institute for Public Health and the Environment [Bilthoven] (RIVM), Environment and Climate Change Canada, Institut Royal Météorologique de Belgique [Bruxelles] - Royal Meteorological Institute (IRM), Karlsruher Institut für Technologie (KIT), Alfred-Wegener-Institut, Helmholtz-Zentrum für Polar- und Meeresforschung (AWI), University of Toronto, University of Bremen, Science Systems and Applications, Inc. [Lanham] (SSAI), Instituto de Investigaciones Científicas y Técnicas para la Defensa (CITEDEF), California Institute of Technology (CALTECH)-NASA, Institut national des sciences de l'Univers (INSU - CNRS)-Météo France-Université de La Réunion (UR)-Centre National de la Recherche Scientifique (CNRS), Consiglio Nazionale delle Ricerche [Roma] (CNR), Institut Royal Météorologique de Belgique [Bruxelles] (IRM), Centre National de la Recherche Scientifique (CNRS)-Université de La Réunion (UR)-Institut national des sciences de l'Univers (INSU - CNRS)-Météo France, and Cardon, Catherine

Subjects
[PHYS.PHYS.PHYS-AO-PH]Physics [physics]/Physics [physics]/Atmospheric and Oceanic Physics [physics.ao-ph], [PHYS.PHYS.PHYS-AO-PH] Physics [physics]/Physics [physics]/Atmospheric and Oceanic Physics [physics.ao-ph]
Abstract

International audience; In recent years, many analyses of space- and ground-based data records reported signs or evidence of increasing ozone concentrations in the extrapolar upper stratosphere since the late 1990s. However, the magnitude and significance of the trend estimates vary from one study to another, prompting the ozone research community to further investigate the causes of these differences. A broader consensus has emerged in the past year, placing the positive trend in the upper stratosphere on solid ground and heralding the start of an observation-based exploration of the recovery of stratospheric ozone. More accurate trend estimates are needed to identify the geophysical processes contributing to the recovery and their relative importance. Uncovering seasonal and spatial trend patterns will be key in reaching this objective, not just in the extrapolar upper stratosphere but elsewhere as well.However, at the moment, it remains unclear whether current ozone profile observing systems are able to provide this information. We address this question with an exploration of the capabilities and limitations of current data records in space (limb/occultation sounders) and on the ground (NDACC/GAW/SHADOZ-affiliated sonde, stratospheric lidar and microwave radiometer sites) to infer decadal trends and their vertical, latitudinal and seasonal patterns. We focus on long-term stability, one of the key drivers of the ability to detect trends. We present updated results of a comprehensive analysis that allowed us to quantify the drift of satellite data relative to the ground-based networks (Hubert et al., 2016). In a companion analysis we exploited the satellite data to uncover temporal and spatial inhomogeneities in the ground-based time series, some of which were traced to known changes occurring at different moments across the network. These changes add to the challenge to derive unbiased ozone trends from ground-based observations and they impede our ability to constrain satellite drift to the level required for current and future ozone trend assessments. We conclude that ongoing efforts to homogenise the ground-based data records are essential.

Published
2017

11. Curriculum vitae of the LOTOS–EUROS (v2.0) chemistry transport model

Author

Manders, Astrid M. M., primary, Builtjes, Peter J. H., additional, Curier, Lyana, additional, Denier van der Gon, Hugo A. C., additional, Hendriks, Carlijn, additional, Jonkers, Sander, additional, Kranenburg, Richard, additional, Kuenen, Jeroen J. P., additional, Segers, Arjo J., additional, Timmermans, Renske M. A., additional, Visschedijk, Antoon J. H., additional, Wichink Kruit, Roy J., additional, van Pul, W. Addo J., additional, Sauter, Ferd J., additional, van der Swaluw, Eric, additional, Swart, Daan P. J., additional, Douros, John, additional, Eskes, Henk, additional, van Meijgaard, Erik, additional, van Ulft, Bert, additional, van Velthoven, Peter, additional, Banzhaf, Sabine, additional, Mues, Andrea C., additional, Stern, Rainer, additional, Fu, Guangliang, additional, Lu, Sha, additional, Heemink, Arnold, additional, van Velzen, Nils, additional, and Schaap, Martijn, additional

Published
2017
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15. Uncertainties in recent satellite ozone profile trend assessments (SI2N, WMO 2014) : A network-based assessment of fourteen contributing limb and occultation data records

Author

Hubert, Daan, Lambert, Jean-Christopher, Verhoelst, Tijl, Granville, José, Keppens, Arno, Cortesi, Ugo, Degenstein, Doug A., Froidevaux, Lucien, Godin-Beekmann, Sophie, Hoppel, Karl W., Kyrölä, Erkki, Leblanc, Thierry, Lichtenberg, Guenter, Mcdermid, I. Stuart, Mcelroy, Tom, Murtagh, Donal, Nakane, Hideaki, Russell III, James R., Smit, Herman G. J., Stebel, Kerstin, Steinbrecht, Wolfgang, Stübi, René, Swart, Daan P. J., Taha, Ghassan, Thompson, Anne M., Urban, Joachim, Van Gijsel, Anne, Von Der Gathen, Peter, Walker, Kaley A., Zawodny, Joseph M., Cardon, Catherine, Belgian Institute for Space Aeronomy / Institut d'Aéronomie Spatiale de Belgique (BIRA-IASB), Istituto di Fisica Applicata 'Nello Carrara' (IFAC), Consiglio Nazionale delle Ricerche [Roma] (CNR), University of Saskatchewan [Saskatoon] (U of S), Jet Propulsion Laboratory (JPL), NASA-California Institute of Technology (CALTECH), 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), Naval Research Laboratory (NRL), Finnish Meteorological Institute (FMI), German Aerospace Center (DLR), Department of Earth and Space Science and Engineering [York University - Toronto] (ESSE), York University [Toronto], Chalmers Techniska Högskola, University of Gothenburg (GU), National Institute for Environmental Studies (NIES), Center for Atmospheric Sciences [Hampton] (CAS), Hampton University, Institut für Energie- und Klimaforschung - Troposphäre (IEK-8), Forschungszentrum Jülich GmbH | Centre de recherche de Juliers, Helmholtz-Gemeinschaft = Helmholtz Association-Helmholtz-Gemeinschaft = Helmholtz Association, Norwegian Institute for Air Research (NILU), Meteorologisches Observatorium Hohenpeißenberg (MOHp), Deutscher Wetterdienst [Offenbach] (DWD), Federal Office of Meteorology and Climatology MeteoSwiss, National Institute for Public Health and the Environment [Bilthoven] (RIVM), NASA Goddard Space Flight Center (GSFC), Chalmers University of Technology [Göteborg], Royal Netherlands Meteorological Institute (KNMI), Alfred-Wegener-Institut, Helmholtz-Zentrum für Polar- und Meeresforschung (AWI), University of Toronto, NASA Langley Research Center [Hampton] (LaRC), and National Research Council of Italy | Consiglio Nazionale delle Ricerche (CNR)

Subjects
[PHYS.PHYS.PHYS-AO-PH]Physics [physics]/Physics [physics]/Atmospheric and Oceanic Physics [physics.ao-ph], [PHYS.PHYS.PHYS-AO-PH] Physics [physics]/Physics [physics]/Atmospheric and Oceanic Physics [physics.ao-ph]
Abstract

International audience; Numerous vertical ozone profile data records collected over the past decades from space-based platforms have the potential to allow the ozone and climate communities to tackle a variety of research questions. A prime topic is the study and documentation of long-term changes in the vertical distribution of atmospheric ozone, as targeted by the recent SPARC/IO3C/IGACO-O3/NDACC Initiative (SI2N) and WMO’s ozone assessment. Such studies typically require data records with documented mutual consistency in terms of bias and long-term stability. Ground-based networks play a pivotal role in evaluating which satellite records comply with end-user requirements and are fit for their purpose. They provide high-quality, independent measurements on a pseudo- global scale from the ground up to the stratosphere.Here, we present an assessment of the long-term stability and mutual consistency of fourteen limb/occultation ozone profile data records, using NDACC/GAW/SHADOZ ozonesonde and NDACC lidar network data as reference standards. We show how a harmonized analysis framework and robust statistical methods allow us to derive reliable estimates of the drift, bias, and short-term variability of each satellite data record. We examine the dependence of these parameters on altitude and, whenever feasible, on latitude and season. The analysis is furthermore performed in four different ozone profile representations, as it turns out that auxiliary data used for unit and representation conversions can impact data quality. We discuss the mutual consistency and compliance of satellite data sets with respect to specific user requirements from GCOS and from climate research groups. We conclude by reflecting on the implication of our results for trend assessments on recently merged ozone profile records (Ozone_CCI, GOZCARDS, SWOOSH, ...)

Published
2015

16. Ground-based assessment of the bias and long-term stability of 14 limb and occultation ozone profile data records

Author

Hubert, Daan, Lambert, Jean-Christopher, Verhoelst, Tijl, Granville, José, Keppens, Arno, Baray, Jean-Luc, Bourassa, Adam E., Cortesi, Ugo, Degenstein, Doug A., Froidevaux, Lucien, Godin-Beekmann, Sophie, Hoppel, Karl W., Johnson, Bryan J., Kyrölä, Erkki, Leblanc, Thierry, Lichtenberg, Günter, Marchand, Marion, McElroy, C. Thomas, Murtagh, Donal, Nakane, Hideaki, Portafaix, Thierry, Querel, Richard, Russel III, James M., Salvador, Jacobo, Smit, Herman G. J., Stebel, Kerstin, Steinbrecht, Wolfgang, Strawbridge, Kevin B., Stübi, René, Swart, Daan P. J., Taha, Ghassan, Tarasick, David W., Thompson, Anna M., Urban, Joachim, van Gijsel, Joanna A. E., Van Malderen, Roeland, von der Gathen, Peter, Walker, Kaley A., Wolfram, Elian, Zawodny, Joseph M., Hubert, Daan, Lambert, Jean-Christopher, Verhoelst, Tijl, Granville, José, Keppens, Arno, Baray, Jean-Luc, Bourassa, Adam E., Cortesi, Ugo, Degenstein, Doug A., Froidevaux, Lucien, Godin-Beekmann, Sophie, Hoppel, Karl W., Johnson, Bryan J., Kyrölä, Erkki, Leblanc, Thierry, Lichtenberg, Günter, Marchand, Marion, McElroy, C. Thomas, Murtagh, Donal, Nakane, Hideaki, Portafaix, Thierry, Querel, Richard, Russel III, James M., Salvador, Jacobo, Smit, Herman G. J., Stebel, Kerstin, Steinbrecht, Wolfgang, Strawbridge, Kevin B., Stübi, René, Swart, Daan P. J., Taha, Ghassan, Tarasick, David W., Thompson, Anna M., Urban, Joachim, van Gijsel, Joanna A. E., Van Malderen, Roeland, von der Gathen, Peter, Walker, Kaley A., Wolfram, Elian, and Zawodny, Joseph M.

Abstract

The ozone profile records of a large number of limb and occultation satellite instruments are widely used to address several key questions in ozone research. Further progress in some domains depends on a more detailed understanding of these data sets, especially of their long-term stability and their mutual consistency. To this end, we made a systematic assessment of 14 limb and occultation sounders that, together, provide more than three decades of global ozone profile measurements. In particular, we considered the latest operational Level-2 records by SAGE II, SAGE III, HALOE, UARS MLS, Aura MLS, POAM II, POAM III, OSIRIS, SMR, GOMOS, MIPAS, SCIAMACHY, ACE-FTS and MAESTRO. Central to our work is a consistent and robust analysis of the comparisons against the ground-based ozonesonde and stratospheric ozone lidar networks. It allowed us to investigate, from the troposphere up to the stratopause, the following main aspects of satellite data quality: long-term stability, overall bias and short-term variability, together with their dependence on geophysical parameters and profile representation. In addition, it permitted us to quantify the overall consistency between the ozone profilers. Generally, we found that between 20 and 40 km the satellite ozone measurement biases are smaller than ±5 %, the short-term variabilities are less than 5–12 % and the drifts are at most ±5 % per decade (or even ±3 % per decade for a few records). The agreement with ground-based data degrades somewhat towards the stratopause and especially towards the tropopause where natural variability and low ozone abundances impede a more precise analysis. In part of the stratosphere a few records deviate from the preceding general conclusions; we identified biases of 10 % and more (POAM II and SCIAMACHY), markedly higher single-profile variability (SMR and SCIAMACHY) and significant long-term drifts (SCIAMACHY, OSIRIS, HALOE and possibly GOMOS and SMR as well). Furthermore, we reflected on the rep

Published
2016

17. Ground-based assessment of the bias and long-term stability of 14 limb and occultation ozone profile data records

Author

Hubert, Daan, primary, Lambert, Jean-Christopher, additional, Verhoelst, Tijl, additional, Granville, José, additional, Keppens, Arno, additional, Baray, Jean-Luc, additional, Bourassa, Adam E., additional, Cortesi, Ugo, additional, Degenstein, Doug A., additional, Froidevaux, Lucien, additional, Godin-Beekmann, Sophie, additional, Hoppel, Karl W., additional, Johnson, Bryan J., additional, Kyrölä, Erkki, additional, Leblanc, Thierry, additional, Lichtenberg, Günter, additional, Marchand, Marion, additional, McElroy, C. Thomas, additional, Murtagh, Donal, additional, Nakane, Hideaki, additional, Portafaix, Thierry, additional, Querel, Richard, additional, Russell III, James M., additional, Salvador, Jacobo, additional, Smit, Herman G. J., additional, Stebel, Kerstin, additional, Steinbrecht, Wolfgang, additional, Strawbridge, Kevin B., additional, Stübi, René, additional, Swart, Daan P. J., additional, Taha, Ghassan, additional, Tarasick, David W., additional, Thompson, Anne M., additional, Urban, Joachim, additional, van Gijsel, Joanna A. E., additional, Van Malderen, Roeland, additional, von der Gathen, Peter, additional, Walker, Kaley A., additional, Wolfram, Elian, additional, and Zawodny, Joseph M., additional

Published
2016
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18. Replacing the AMOR by the miniDOAS in the ammonia monitoring network in the Netherlands.

Author

Berkhout, A. J. C. Stijn, Swart, Daan P. J., Volten, Hester, Gast, Lou F. L., Haaima, Marty, Verboom, Hans, Stefess, Guus, Hafkenscheid, Theo, and Hoogerbrugge, Ronald

Subjects
*AMMONIA & the environment, *ENVIRONMENTAL monitoring, *LIGHT absorption
Abstract

In this paper we present the continued development of the miniDOAS, an active differential optical absorption spectroscopy (DOAS) instrument to measure ammonia concentrations in ambient air. The miniDOAS has been adapted for use in the Dutch National Air Quality Monitoring Network. The miniDOAS replaces the life-expired continuous-flow denuder ammonia monitor (AMOR). From September 2014 to December 2015, both instruments measured in parallel before the change from AMOR to miniDOAS was made. The instruments were deployed on six monitoring stations throughout the Netherlands. We report on the results of this intercomparison. Both instruments show a good uptime of ca. 90%, adequate for an automatic monitoring network. Although both instruments produce minute values of ammonia concentrations, a direct comparison on short timescales such as minutes or hours does not give meaningful results, because the AMOR response to changing ammonia concentrations is slow. Comparisons between daily and monthly values show a good agreement. For monthly averages, we find a small average offset of 0.65 ± 0.28 µgm-3 and a slope of 1.034 ± 0.028, with the miniDOAS measuring slightly higher than the AMOR. The fast time resolution of the miniDOAS makes the instrument not only suitable for monitoring but also for process studies. [ABSTRACT FROM AUTHOR]

Published
2017
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19. Testing and improving OMI DOMINO tropospheric NO2 using observations from the DANDELIONS and INTEX‐B validation campaigns

Author

Hains, Jennifer C., primary, Boersma, K. Folkert, additional, Kroon, Mark, additional, Dirksen, Ruud J., additional, Cohen, Ronald C., additional, Perring, Anne E., additional, Bucsela, Eric, additional, Volten, Hester, additional, Swart, Daan P. J., additional, Richter, Andreas, additional, Wittrock, Folkard, additional, Schoenhardt, Anja, additional, Wagner, Thomas, additional, Ibrahim, Ossama W., additional, van Roozendael, Michel, additional, Pinardi, Gaia, additional, Gleason, James F., additional, Veefkind, J. Pepijn, additional, and Levelt, Pieternel, additional

Published
2010
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20. Five years of observations of ozone profiles over Lauder, New Zealand

Author

Brinksma, Ellen J., Ajtić, Jelena, Bergwerff, J. B., Bodeker, Gregory E., Boyd, Ian S., de Haan, Johan F., Hogervorst, Wim, Hovenier, Joachim W., Swart, Daan P. J., Brinksma, Ellen J., Ajtić, Jelena, Bergwerff, J. B., Bodeker, Gregory E., Boyd, Ian S., de Haan, Johan F., Hogervorst, Wim, Hovenier, Joachim W., and Swart, Daan P. J.

Abstract

Altitude profiles of ozone (O3) over Lauder (45°S, 170°E) performed using a lidar, ozonesondes, and the satellite-borne Stratospheric Aerosol and Gas Experiment (SAGE II) instrument are presented. These data form one of the few long-term sets of O3 profiles at a Southern Hemisphere location. In the 5 years of data presented, the dominant variation is the annual cycle, the phase and amplitude of which differ below and above 27.5 km. Superposed are irregular episodic variations, caused by various processes. The first process studied is stratosphere-troposphere exchange, characterized by dry and O3-rich air residing in the troposphere, which was found in 21% of the measurements. The second relates to the positioning of the higher polar vortex over Lauder, often in combination with the exchange of air between midlatitude and subtropical stratospheric regions. We present examples of this which were observed over Lauder during the 1997 winter. This winter was selected for further study because of the record-low O3 amounts measured. The third process is mixing of O3-depleted vortex air with midlatitude air after the vortex breakup. We present one example, which shows that a filament originating from the depleted Antarctic vortex significantly lowers O3 amounts over Lauder around 27 November 1997. There is thus a connection between Antarctic O3 depletion and later decrease of O3 amounts at a Southern Hemisphere midlatitude location, namely Lauder.

Published
2002

23. Testing and improving OMI DOMINO tropospheric NO2 using observations from the DANDELIONS and INTEX-B validation campaigns.

Author

Hains, Jennifer C., Boersma, K. Folkert, Kroon, Mark, Dirksen, Ruud J., Cohen, Ronald C., Perring, Anne E., Bucsela, Eric, Volten, Hester, Swart, Daan P. J., Richter, Andreas, Wittrock, Folkard, Schoenhardt, Anja, Wagner, Thomas, Ibrahim, Ossama W., van Roozendael, Michel, Pinardi, Gaia, Gleason, James F., Veefkind, J. Pepijn, and Levelt, Pieternel

Published
2010
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