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1. 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

2. Validation of 10-year SAO OMI Ozone Profile (PROFOZ) product using ozonesonde observations

Author

Tristan J. Hall, Bertrand Calpini, Bogumil Kois, Roeland Van Malderen, René Stübi, Marion Marchand, Marc Allaart, Masatomo Fujiwara, Thierry Leblanc, Anne M. Thompson, M.B. Tully, Richard Querel, Everette Joseph, Françoise Posny, Ghassan Taha, Kai Yang, Zhaonan Cai, Giovanni Laneve, Michael J. Newchurch, Manvendra K. Dubey, Gary A. Morris, Hugo De Backer, Rinus Scheele, Xiong Liu, Jacquelyn C. Witte, Kenneth R. Minschwaner, Nozomu Ohkawara, Ankie Piters, Kelly Chance, Shin-Ya Ogino, Margarita Yela, Ninong Komala, Emilio Cuevas-Agulló, H. B. Selkirk, Sophie Godin-Beekmann, Guanyu Huang, Manuel Cupeiro, Valérie Thouret, Holger Vömel, Russell C. Schnell, Gerrie Coetzee, Pawan K. Bhartia, Masato Shiotani, Gérard Ancellet, Otto Schrems, Bryan J. Johnson, Gert König-Langlo, Rigel Kivi, F. J. Schmidlin, Peter von der Gathen, P. Skrivankova, David W. Tarasick, Henry E. Fuelberg, Harvard-Smithsonian Center for Astrophysics (CfA), Harvard University [Cambridge]-Smithsonian Institution, Department of Atmospheric and Oceanic Science [College Park] (AOSC), University of Maryland [College Park], University of Maryland System-University of Maryland System, NASA Goddard Space Flight Center (GSFC), Royal Netherlands Meteorological Institute (KNMI), TROPO - LATMOS, Laboratoire Atmosphères, Milieux, Observations Spatiales (LATMOS), Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Université Pierre et Marie Curie - Paris 6 (UPMC)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Université Pierre et Marie Curie - Paris 6 (UPMC)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS), Payerne Aerological Station, Federal Office of Meteorology and Climatology MeteoSwiss, South African Weather Service (SAWS), Izaña Atmospheric Research Center (IARC), Agencia Estatal de Meteorología (AEMet), National Meteorological Service [Ushuaia], Institut Royal Météorologique de Belgique [Bruxelles] (IRM), Los Alamos National Laboratory (LANL), Department of Earth, Ocean and Atmospheric Science [Tallahassee] (FSU | EOAS), Florida State University [Tallahassee] (FSU), Faculty of Environmental Earth Science [Sapporo], Hokkaido University [Sapporo, Japan], STRATO - LATMOS, ESRL Global Monitoring Laboratory [Boulder] (GML), NOAA Earth System Research Laboratory (ESRL), National Oceanic and Atmospheric Administration (NOAA)-National Oceanic and Atmospheric Administration (NOAA), Atmospheric Sciences Research Center (ASRC), University at Albany [SUNY], State University of New York (SUNY)-State University of New York (SUNY), Finnish Meteorological Institute (FMI), Institute of Meteorology and Water Management - National Research Institute (IMGW - PIB), Indonesian National Institute of Aeronautics and Space (LAPAN), Alfred-Wegener-Institut, Helmholtz-Zentrum für Polar- und Meeresforschung (AWI), Earth Observation Satellite Images Applications Laboratory (EOSIAL), Università degli Studi di Roma 'La Sapienza' = Sapienza University [Rome], Jet Propulsion Laboratory (JPL), NASA-California Institute of Technology (CALTECH), Department of Physics [Socorro], New Mexico Institute of Mining and Technology [New Mexico Tech] (NMT), St. Edward's University, Department of Atmospheric Science [Huntsville], University of Alabama in Huntsville (UAH), Department of Coupled Ocean-Atmosphere-Land Processes Research (DCOP), Japan Agency for Marine-Earth Science and Technology (JAMSTEC), Global Environment and Marine Department [Tokyo], Japan Meteorological Agency (JMA), Laboratoire de l'Atmosphère et des Cyclones (LACy), Centre National de la Recherche Scientifique (CNRS)-Université de La Réunion (UR)-Institut national des sciences de l'Univers (INSU - CNRS)-Météo France, Observatoire des Sciences de l'Univers de La Réunion (OSU-Réunion), Institut national des sciences de l'Univers (INSU - CNRS)-Université de La Réunion (UR), National Institute of Water and Atmospheric Research [Lauder] (NIWA), Universities Space Research Association (USRA), Research Institute for Sustainable Humanosphere (RISH), Kyoto University [Kyoto], Czech Hydrometeorological Institute (CHMI), Environment and Climate Change Canada, Laboratoire d'aérologie (LAERO), Centre National de la Recherche Scientifique (CNRS)-Observatoire Midi-Pyrénées (OMP), Météo France-Centre National d'Études Spatiales [Toulouse] (CNES)-Université Fédérale Toulouse Midi-Pyrénées-Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche pour le Développement (IRD)-Météo France-Centre National d'Études Spatiales [Toulouse] (CNES)-Université Fédérale Toulouse Midi-Pyrénées-Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche pour le Développement (IRD)-Université Toulouse III - Paul Sabatier (UT3), Université Fédérale Toulouse Midi-Pyrénées, Australian Bureau of Meteorology [Melbourne] (BoM), Australian Government, Earth Observing Laboratory [Boulder] (EOL), National Center for Atmospheric Research [Boulder] (NCAR)-University Corporation for Atmospheric Research (UCAR), Science Systems and Applications, Inc. [Lanham] (SSAI), Instituto Nacional de Técnica Aeroespacial (INTA), Harvard University-Smithsonian Institution, Institut Royal Météorologique de Belgique [Bruxelles] - Royal Meteorological Institute (IRM), Università degli Studi di Roma 'La Sapienza' = Sapienza University [Rome] (UNIROMA), Institut national des sciences de l'Univers (INSU - CNRS)-Université de La Réunion (UR)-Centre National de la Recherche Scientifique (CNRS)-Météo-France, Kyoto University, Université Toulouse III - Paul Sabatier (UT3), Université de Toulouse (UT)-Université de Toulouse (UT)-Observatoire Midi-Pyrénées (OMP), Institut de Recherche pour le Développement (IRD)-Université Toulouse III - Paul Sabatier (UT3), and Université de Toulouse (UT)-Université de Toulouse (UT)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National d'Études Spatiales [Toulouse] (CNES)-Centre National de la Recherche Scientifique (CNRS)-Météo-France -Institut de Recherche pour le Développement (IRD)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National d'Études Spatiales [Toulouse] (CNES)-Centre National de la Recherche Scientifique (CNRS)-Météo-France -Centre National de la Recherche Scientifique (CNRS)

Subjects
Atmospheric Science, 010504 meteorology & atmospheric sciences, Cloud cover, 0211 other engineering and technologies, 02 engineering and technology, 01 natural sciences, Latitude, Troposphere, Ozone layer, lcsh:TA170-171, Stratosphere, 021101 geological & geomatics engineering, 0105 earth and related environmental sciences, validation, Ozone Monitoring Instrument, [PHYS.PHYS.PHYS-AO-PH]Physics [physics]/Physics [physics]/Atmospheric and Oceanic Physics [physics.ao-ph], [SDU.OCEAN]Sciences of the Universe [physics]/Ocean, Atmosphere, lcsh:TA715-787, Anomaly (natural sciences), OMI, lcsh:Earthwork. Foundations, ozone, lcsh:Environmental engineering, Trace gas, 13. Climate action, Climatology, Environmental science
Abstract

We validate the Ozone Monitoring Instrument (OMI) Ozone Profile (PROFOZ) product from October 2004 through December 2014 retrieved by the Smithsonian Astrophysical Observatory (SAO) algorithm against ozonesonde observations. We also evaluate the effects of OMI row anomaly (RA) on the retrieval by dividing the dataset into before and after the occurrence of serious OMI RA, i.e., pre-RA (2004–2008) and post-RA (2009–2014). The retrieval shows good agreement with ozonesondes in the tropics and midlatitudes and for pressure ∼ 50 hPa after applying OMI averaging kernels to ozonesonde data. The MBs of the stratospheric ozone column (SOC, the ozone column from the tropopause pressure to the ozonesonde burst pressure) are within 2 % with SDs of ∼ 50 hPa. The SOC MBs increase up to 3 % with SDs as great as 6 % and the TOC SDs increase up to 30 %. The comparison generally degrades at larger solar zenith angles (SZA) due to weaker signals and additional sources of error, leading to worse performance at high latitudes and during the midlatitude winter. Agreement also degrades with increasing cloudiness for pressure > ∼ 100 hPa and varies with cross-track position, especially with large MBs and SDs at extreme off-nadir positions. In the tropics and midlatitudes, the post-RA comparison is considerably worse with larger SDs reaching 2 % in the stratosphere and 8 % in the troposphere and up to 6 % in TOC. There are systematic differences that vary with latitude compared to the pre-RA comparison. The retrieval comparison demonstrates good long-term stability during the pre-RA period but exhibits a statistically significant trend of 0.14–0.7 % year−1 for pressure

Published
2017

3. Comprehensive quality assessment of GOME- and IASI-type multi-mission tropospheric ozone data records

Author

Keppens, Arno, Lambert, Jean-Christopher, Hubert, D., Granville, J., Verhoelst, T., Compernolle, S., Van Peet, J., Van Der A, R., Miles, G., Siddans, R., Clerbaux, Cathy, Coheur, Pierre-François, Delcloo, Andy, Godin-Beekmann, Sophie, Kivi, R., Stübi, R., Zehner, C., Belgian Institute for Space Aeronomy / Institut d'Aéronomie Spatiale de Belgique (BIRA-IASB), Royal Netherlands Meteorological Institute (KNMI), STFC Rutherford Appleton Laboratory (RAL), Science and Technology Facilities Council (STFC), TROPO - LATMOS, Laboratoire Atmosphères, Milieux, Observations Spatiales (LATMOS), Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Université Pierre et Marie Curie - Paris 6 (UPMC)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Université Pierre et Marie Curie - Paris 6 (UPMC)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS), Spectroscopie de l'atmosphère, Service de Chimie Quantique et Photophysique, Université libre de Bruxelles (ULB), Institut Royal Météorologique de Belgique [Bruxelles] (IRM), STRATO - LATMOS, Finnish Meteorological Institute (FMI), Federal Office of Meteorology and Climatology MeteoSwiss, Payerne Aerological Station, European Space Research Institute (ESRIN), European Space Agency (ESA), International Ozone Commission, Institut Royal Météorologique de Belgique [Bruxelles] - Royal Meteorological Institute (IRM), and Agence Spatiale Européenne = European Space Agency (ESA)

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

International audience; Tropospheric ozone plays a key role in air quality and has a significant impact on the radiation budget of the Earth, both directly and through its chemical influence on other trace gases. Assessments of atmospheric composition change and of associated climate change therefore demand accurate observations of the tropospheric ozone, both on the global and regional scales and both in the longer and shorter term. Such observations have been provided by two series of European nadir-viewing ozone profilers, namely the scattered-light UV-visible spectrometers of the GOME type, launched regularly since 1995 (GOME, SCIAMACHY, OMI, GOME-2 on MetOp-A/B/C, and the upcoming S-5p TROPOMI and Sentinel-5 missions), and the thermal infrared emission sounders of the IASI type, launched regularly since 2006 (IASI on MetOp platforms and IASI-NG on MetOp-SG). In particular, several tro- pospheric ozone data products have been improved and harmonised in the context of the European Space Agency’s Climate Change Initiative (ESA CCI) on ozone (www.esa-ozone-cci.org). To verify their fitness-for-purpose, those tropospheric ozone datasets must undergo a comprehensive quality assessment (QA), including (a) detailed iden- tification of their geographical, vertical and temporal domains of validity, (b) quantification of their potential bias, noise and drift and their dependences on influence quantities, and (c) assessment of the mutual consistency of data from different sounders. For this purpose we have applied to the aforementioned Ozone CCI datasets a versatile QA/validation system developed over years in the context of ESA’s Multi-TASTE and CCI projects, EUMETSAT’s O3M-SAF, and the European Commission’s GEOmon and QA4ECV. For both GOME- and IASI-type climate data records we report on data content studies, information content studies, and comparisons with co-located reference observations from the well established NDACC, SHADOZ, and GAW ozonesonde networks. Dependence of the tropospheric ozone data quality on major influence quantities and perspectives for the future Sentinel missions are discussed.

Published
2016

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

Author

Bryan J. Johnson, Ghassan Taha, David W. Tarasick, Sophie Godin-Beekmann, Marion Marchand, J. C. Lambert, Kerstin Stebel, Elian Wolfram, Adam Bourassa, Herman G. J. Smit, Arno Keppens, Daan Hubert, Hideaki Nakane, C. Thomas McElroy, Daan Swart, Ugo Cortesi, Karl W. Hoppel, Joanna A. E. van Gijsel, Donal P. Murtagh, James M. Russell, Tijl Verhoelst, Anne M. Thompson, Peter von der Gathen, Erkki Kyrölä, Günter Lichtenberg, Richard Querel, Kevin Strawbridge, Doug Degenstein, Wolfgang Steinbrecht, Kaley A. Walker, Joachim Urban, Roeland Van Malderen, Thierry Portafaix, José Granville, Jean-Luc Baray, Thierry Leblanc, Lucien Froidevaux, Jacobo Salvador, René Stübi, Joseph M. Zawodny, Belgian Institute for Space Aeronomy / Institut d'Aéronomie Spatiale de Belgique (BIRA-IASB), 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, Laboratoire de Météorologie Physique (LaMP), Institut national des sciences de l'Univers (INSU - CNRS)-Université Clermont Auvergne [2017-2020] (UCA [2017-2020])-Centre National de la Recherche Scientifique (CNRS), 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), Istituto di Fisica Applicata 'Nello Carrara' (IFAC), National Research Council of Italy | Consiglio Nazionale delle Ricerche (CNR), 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), NOAA Earth System Research Laboratory (ESRL), National Oceanic and Atmospheric Administration (NOAA), Finnish Meteorological Institute (FMI), DLR Institut für Methodik der Fernerkundung / DLR Remote Sensing Technology Institute (IMF), Deutsches Zentrum für Luft- und Raumfahrt [Oberpfaffenhofen-Wessling] (DLR), University of York [York, UK], Department of Earth and Space Sciences [Göteborg], Chalmers University of Technology [Göteborg], Kochi University of Technology (KUT), National Institute for Environmental Studies (NIES), National Institute of Water and Atmospheric Research [Lauder] (NIWA), Department of Atmospheric and Planetary Sciences [Hampton] (APS), 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), 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), Environment and Climate Change Canada, Payerne Aerological Station, Federal Office of Meteorology and Climatology MeteoSwiss, National Institute for Public Health and the Environment [Bilthoven] (RIVM), NASA Goddard Space Flight Center (GSFC), Universities Space Research Association (USRA), Royal Netherlands Meteorological Institute (KNMI), Institut Royal Météorologique de Belgique [Bruxelles] - Royal Meteorological Institute (IRM), Alfred-Wegener-Institut, Helmholtz-Zentrum für Polar- und Meeresforschung (AWI), Department of Chemistry [Waterloo], University of Waterloo [Waterloo], Department of Physics [Toronto], University of Toronto, NASA Langley Research Center [Hampton] (LaRC), Centre National de la Recherche Scientifique (CNRS)-Université de La Réunion (UR)-Institut national des sciences de l'Univers (INSU - CNRS)-Météo France, Université Clermont Auvergne [2017-2020] (UCA [2017-2020])-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS), Consiglio Nazionale delle Ricerche [Roma] (CNR), and Institut Royal Météorologique de Belgique [Bruxelles] (IRM)

Subjects
[PHYS.PHYS.PHYS-AO-PH]Physics [physics]/Physics [physics]/Atmospheric and Oceanic Physics [physics.ao-ph], Atmospheric Science, 010504 meteorology & atmospheric sciences, Meteorology, lcsh:TA715-787, lcsh:Earthwork. Foundations, 010502 geochemistry & geophysics, 01 natural sciences, Occultation, Ozone depletion, SCIAMACHY, lcsh:Environmental engineering, Troposphere, Zeppelinobservatoriet, 13. Climate action, Stratopause, Ozone layer, ddc:550, Environmental science, Tropopause, lcsh:TA170-171, Stratosphere, 0105 earth and related environmental sciences
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 % decade−1 (or even ±3 % decade−1 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 repercussions of our findings for the construction, analysis and interpretation of merged data records. Most notably, the discrepancies between several recent ozone profile trend assessments can be mostly explained by instrumental drift. This clearly demonstrates the need for systematic comprehensive multi-instrument comparison analyses.

Published
2016

5. New particle formation and ultrafine charged aerosol climatology at a high altitude site in the Alps (Jungfraujoch, 3580 m a.s.l., Switzerland)

Author

R. Bütikofer, Paolo Laj, David Picard, M. Collaud Coen, G. Wehrle, E. Flückiger, H. Venzac, Karine Sellegri, Urs Baltensperger, J. Boulon, Ernest Weingartner, Laboratoire de météorologie physique (LaMP), Centre National de la Recherche Scientifique (CNRS)-Université Blaise Pascal - Clermont-Ferrand 2 (UBP)-Institut national des sciences de l'Univers (INSU - CNRS), Laboratory of Atmospheric Chemistry [Paul Scherrer Institute] (LAC), Paul Scherrer Institute (PSI), Payerne Aerological Station, Federal Office of Meteorology and Climatology MeteoSwiss, Physikalisches Institut [Bern], Universität Bern [Bern], Laboratoire de glaciologie et géophysique de l'environnement (LGGE), Centre National de la Recherche Scientifique (CNRS)-Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire des Sciences de l'Univers de Grenoble (OSUG), Université Joseph Fourier - Grenoble 1 (UJF)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Institut national des sciences de l'Univers (INSU - CNRS)-Institut national de recherche en sciences et technologies pour l'environnement et l'agriculture (IRSTEA)-Université Savoie Mont Blanc (USMB [Université de Savoie] [Université de Chambéry])-Centre National de la Recherche Scientifique (CNRS)-Université Joseph Fourier - Grenoble 1 (UJF)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Institut national de recherche en sciences et technologies pour l'environnement et l'agriculture (IRSTEA)-Université Savoie Mont Blanc (USMB [Université de Savoie] [Université de Chambéry])-Centre National de la Recherche Scientifique (CNRS), Centre National de la Recherche Scientifique (CNRS)-Institut national des sciences de l'Univers (INSU - CNRS)-Université Blaise Pascal - Clermont-Ferrand 2 (UBP), Observatoire des Sciences de l'Univers de Grenoble (OSUG), Université Savoie Mont Blanc (USMB [Université de Savoie] [Université de Chambéry])-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP)-Institut national de recherche en sciences et technologies pour l'environnement et l'agriculture (IRSTEA)-Université Joseph Fourier - Grenoble 1 (UJF)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-Université Grenoble Alpes (UGA)-Université Savoie Mont Blanc (USMB [Université de Savoie] [Université de Chambéry])-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP)-Institut national de recherche en sciences et technologies pour l'environnement et l'agriculture (IRSTEA)-Université Joseph Fourier - Grenoble 1 (UJF)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-Université Grenoble Alpes (UGA)-Centre National de la Recherche Scientifique (CNRS), Université Blaise Pascal - Clermont-Ferrand 2 (UBP)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS), Universität Bern [Bern] (UNIBE), and Université Joseph Fourier - Grenoble 1 (UJF)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Institut national des sciences de l'Univers (INSU - CNRS)-Institut national de recherche en sciences et technologies pour l'environnement et l'agriculture (IRSTEA)-Université Savoie Mont Blanc (USMB [Université de Savoie] [Université de Chambéry])-Centre National de la Recherche Scientifique (CNRS)-Université Joseph Fourier - Grenoble 1 (UJF)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Institut national des sciences de l'Univers (INSU - CNRS)-Institut national de recherche en sciences et technologies pour l'environnement et l'agriculture (IRSTEA)-Université Savoie Mont Blanc (USMB [Université de Savoie] [Université de Chambéry])-Centre National de la Recherche Scientifique (CNRS)-Centre National de la Recherche Scientifique (CNRS)

Subjects
Atmospheric Science, 010504 meteorology & atmospheric sciences, Chemistry, Nucleation, 010501 environmental sciences, Effects of high altitude on humans, Seasonality, Atmospheric sciences, medicine.disease, 01 natural sciences, Charged particle, lcsh:QC1-999, Aerosol, Eastern european, Troposphere, lcsh:Chemistry, lcsh:QD1-999, 13. Climate action, Climatology, medicine, [SDU.STU.GM]Sciences of the Universe [physics]/Earth Sciences/Geomorphology, Air mass, lcsh:Physics, 0105 earth and related environmental sciences
Abstract

We investigate the formation and growth of charged aerosols clusters at Jungfraujoch, in the Swiss Alps (3580 m a.s.l.), the highest altitude site of the European EUCAARI project intensive campaign. Charged particles and clusters (0.5–1.8 nm) were measured from April 2008 to April 2009 and allowed the detection of nucleation events in this very specific environment (presence of free tropospheric air and clouds). We found that the naturally charged aerosol concentrations, which are dominated by the cluster size class, shows a strong diurnal pattern likely linked to valley breezes transporting surface layer ion precursors, presumably radon. Cosmic rays were found not to be the major ion source at the measurement site. However, at night, when air masses are more representative of free tropospheric conditions, we found that the cluster concentrations are still high. The charged aerosol size distribution and concentration are strongly influenced by the presence of clouds at the station. Clouds should be taken into account when deriving high altitude nucleation statistics. New particle formation occurs on average 17.5% of the measurement period and shows a weak seasonality with a minimum of frequency during winter, but this seasonality is enhanced when the data set is screened for periods when the atmospheric station is out of clouds. The role of ions in the nucleation process was investigated and we found that the ion-mediated nucleation explains 22.3% of the particle formation. The NPF events frequency is correlated with UV radiation but not with calculated H2SO4 concentrations, suggesting that other compounds such as organic vapors are involved in the nucleation and subsequently growth process. In fact, NPF events frequency also surprisingly increases with the condensational sink (CS), suggesting that at Jungfraujoch, the presence of condensing vapours probably coupled with high CS are driving the occurrence of NPF events. A strong link to the air mass path was also pointed out and events were observed to be frequently occurring in Eastern European air masses, which present the highest condensational sink. In these air masses, pre-existing cluster concentrations are more than three time larger than in other air masses during event days, and no new clusters formation is observed, contrarily to what is happening in other air mass types.

Published
2010

6. Extreme events in total ozone over Arosa – Part 1: Application of extreme value theory

Author

J. A. Maeder, Mathieu Ribatet, Philipp Weihs, F. Holawe, Th. Peter, Anthony C. Davison, Harald E. Rieder, René Stübi, Johannes Staehelin, Institute for Atmospheric and Climate Science [Zürich] (IAC), Eidgenössische Technische Hochschule - Swiss Federal Institute of Technology [Zürich] (ETH Zürich), Institut de Mathématiques et de Modélisation de Montpellier (I3M), Centre National de la Recherche Scientifique (CNRS)-Université Montpellier 2 - Sciences et Techniques (UM2)-Université de Montpellier (UM), Département de Mathématiques - EPFL, Ecole Polytechnique Fédérale de Lausanne (EPFL), Payerne Aerological Station, Federal Office of Meteorology and Climatology MeteoSwiss, Institute for Meteorology and Climatology [Vienna] (BOKU-Met), University of Natural Resources and Life Sciences (BOKU), and Institute for Geography and Regional Research

Subjects
Atmospheric Science, Ozone, 010504 meteorology & atmospheric sciences, 01 natural sciences, lcsh:QC1-999, Maxima and minima, lcsh:Chemistry, 010104 statistics & probability, chemistry.chemical_compound, chemistry, lcsh:QD1-999, 13. Climate action, Generalized Pareto distribution, Polar vortex, Climatology, Ozone layer, Range (statistics), Environmental science, 0101 mathematics, [MATH]Mathematics [math], Extreme value theory, Maxima, ComputingMilieux_MISCELLANEOUS, lcsh:Physics, 0105 earth and related environmental sciences
Abstract

In this study ideas from extreme value theory are for the first time applied in the field of stratospheric ozone research, because statistical analysis showed that previously used concepts assuming a Gaussian distribution (e.g. fixed deviations from mean values) of total ozone data do not adequately address the structure of the extremes. We show that statistical extreme value methods are appropriate to identify ozone extremes and to describe the tails of the Arosa (Switzerland) total ozone time series. In order to accommodate the seasonal cycle in total ozone, a daily moving threshold was determined and used, with tools from extreme value theory, to analyse the frequency of days with extreme low (termed ELOs) and high (termed EHOs) total ozone at Arosa. The analysis shows that the Generalized Pareto Distribution (GPD) provides an appropriate model for the frequency distribution of total ozone above or below a mathematically well-defined threshold, thus providing a statistical description of ELOs and EHOs. The results show an increase in ELOs and a decrease in EHOs during the last decades. The fitted model represents the tails of the total ozone data set with high accuracy over the entire range (including absolute monthly minima and maxima), and enables a precise computation of the frequency distribution of ozone mini-holes (using constant thresholds). Analyzing the tails instead of a small fraction of days below constant thresholds provides deeper insight into the time series properties. Fingerprints of dynamical (e.g. ENSO, NAO) and chemical features (e.g. strong polar vortex ozone loss), and major volcanic eruptions, can be identified in the observed frequency of extreme events throughout the time series. Overall the new approach to analysis of extremes provides more information on time series properties and variability than previous approaches that use only monthly averages and/or mini-holes and mini-highs.

Published
2010

7. Chemical ozone loss in the Arctic winter 2002/2003 determined with Match

Author

Martyn P. Chipperfield, Vladimir Yushkov, Markus Rex, David J. Moore, H. Fast, G. A. Millard, Geraint Vaughan, Hideaki Nakane, Esko Kyrö, Geir O. Braathen, Ralph Lehmann, Hans Claude, P. Viatte, Neil R. P. Harris, Signe B. Andersen, E. Moran, J. Davies, H. Dier, Tomohiro Nagai, E. Reimer, H. Deckelmann, Z. Litynska, P. von der Gathen, René Stübi, P. Skrivankova, Michael Gerding, Marc Allaart, C. Parrondo, H. De Backer, M. Streibel, V. Dorokov, Department of Bentho-pelagic processes, Alfred-Wegener-Institut, Helmholtz-Zentrum für Polar- und Meeresforschung (AWI), European Ozone Research Coordinating Unit [Cambridge] (EORCU), University of Cambridge [UK] (CAM), Norwegian Institute for Air Research (NILU), Met. Institute, FU Berlin, University of Leeds, Centre for Atmospheric Science [Cambridge, UK], Royal Netherlands Meteorological Institute (KNMI), Danish Meteorological Institute (DMI), Meteorologisches Observatorium Hohenpeißenberg (MOHp), Deutscher Wetterdienst [Offenbach] (DWD), Meteorological Service of Canada, 4905 Dufferin Street, RMI, MOL, CAO, Pervomajskaya Street 3, Leibniz-Institut für Atmosphärenphysik (IAP), Universität Rostock-Leibniz Association, SMO, MWM, Centre of Aerology, Met. Office, Fitzroy Road, IMS, Valentia Observatory, Meteorological Research Institute [Tsukuba] (MRI), Japan Meteorological Agency (JMA), National Institute for Environmental Studies (NIES), INTA, Czech Hydrometical Institute, Payerne Aerological Station, Federal Office of Meteorology and Climatology MeteoSwiss, Department of Physics, University of Wales, SMI, University of Manchester, and School of Earth

Subjects
[SDU.OCEAN]Sciences of the Universe [physics]/Ocean, Atmosphere, Atmospheric Science, Ozone, 010504 meteorology & atmospheric sciences, 010502 geochemistry & geophysics, Atmospheric sciences, 01 natural sciences, lcsh:QC1-999, The arctic, lcsh:Chemistry, chemistry.chemical_compound, chemistry, lcsh:QD1-999, 13. Climate action, Climatology, Middle latitudes, Environmental science, Potential temperature, lcsh:Physics, Ozone column, 0105 earth and related environmental sciences
Abstract

The Match technique was used to determine chemically induced ozone loss inside the stratospheric vortex during the Arctic winter 2002/2003. From end of November 2002, which is the earliest start of a Match campaign ever, until end of March 2003 approximately 800 ozonesondes were launched from 34 stations in the Arctic and mid latitudes. Ozone loss rates were quantified from the beginning of December until mid-March in the vertical region of 400–550 K potential temperature. In accordance with the occurrence of a large area of conditions favourable for the formation of polar stratospheric clouds in December ozone destruction rates varied between 10–15 ppbv/day depending on height. Maximum loss rates around 35 ppbv/day were reached during late January. Afterwards ozone loss rates decreased until mid-March when the final warming of the vortex began. In the period from 2 December 2002 to 16 March 2003 the accumulated ozone loss reduced the partial ozone column of 400–500 K potential temperature by 56±4 DU. This value is in good agreement with that inferred from the empirical relation of ozone loss against the volume of potential polar stratospheric clouds within the northern hemisphere. The sensitivity of the results on recent improvements of the approach has been tested.

Published
2006

8. A method for aerosol profiling in the lower troposphere with coupled scatter and meteorological rawindsondes and first data from the tropical Atlantic off Sahara

Author

Hubert Berger, J.M Vinicula Dos Santos, L. Gomes, Bernadette Chatenet, François Dulac, Patrick Chazette, Laboratoire des Sciences du Climat et de l'Environnement [Gif-sur-Yvette] (LSCE), Institut national des sciences de l'Univers (INSU - CNRS)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université de Versailles Saint-Quentin-en-Yvelines (UVSQ), Chimie Atmosphérique Expérimentale (CAE), Institut national des sciences de l'Univers (INSU - CNRS)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Institut national des sciences de l'Univers (INSU - CNRS)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université de Versailles Saint-Quentin-en-Yvelines (UVSQ), Laboratoire Interuniversitaire des Systèmes Atmosphériques (LISA (UMR_7583)), Institut national des sciences de l'Univers (INSU - CNRS)-Université Paris-Est Créteil Val-de-Marne - Paris 12 (UPEC UP12)-Centre National de la Recherche Scientifique (CNRS)-Université de Paris (UP), Payerne Aerological Station, Federal Office of Meteorology and Climatology MeteoSwiss, Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut national des sciences de l'Univers (INSU - CNRS)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS), Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut national des sciences de l'Univers (INSU - CNRS)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS)-Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut national des sciences de l'Univers (INSU - CNRS)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS), and Institut national des sciences de l'Univers (INSU - CNRS)-Université Paris-Est Créteil Val-de-Marne - Paris 12 (UPEC UP12)-Centre National de la Recherche Scientifique (CNRS)-Université Paris Cité (UPCité)

Subjects
[SDU.OCEAN]Sciences of the Universe [physics]/Ocean, Atmosphere, Fluid Flow and Transfer Processes, Atmospheric Science, Environmental Engineering, 010504 meteorology & atmospheric sciences, Meteorology, Nephelometer, Mechanical Engineering, Mineral dust, Tropical Atlantic, Atmospheric sciences, 01 natural sciences, Pollution, Aerosol, 010309 optics, Cape verde, Sun photometer, Troposphere, Lidar, 13. Climate action, 0103 physical sciences, Environmental science, [SDU.ENVI]Sciences of the Universe [physics]/Continental interfaces, environment, ComputingMilieux_MISCELLANEOUS, 0105 earth and related environmental sciences
Abstract

We developed a simple prototype balloonborne aerosol scattering profiler by coupling a small nephelometer with a meteorological sonde and we performed one sounding over Sal Island, Cape Verde, in February 1996 during a turbid episode of dust transport with an aerosol optical thickness (AOT) larger than 0.6 at 870 nm . We also monitored space and time variations in AOT with both Meteosat and a Sun photometer. This allows us to document for the first time the vertical distribution of aerosols during the typical winter situation of low-altitude transport of African dust in the trade winds of the tropical North Atlantic. We derive the vertical profile of aerosol extinction from side-scattering nephelometer measurements by applying corrections for aerosol optical properties. We find that most of the aerosol extinction occurs between about 600 and 1400 m in altitude in a layer of dry air above the atmospheric marine boundary layer (MBL). Our results suggest that about 90% of the dust is transported above the MBL. They confirm previous findings of well-structured African dust layers observed at north mid-latitudes with lidar systems.

Published
2001

9. Changes in ozone over Europe: Analysis of ozone measurements from sondes, regular aircraft (MOZAIC) and alpine surface sites

Author

Logan J. A., Staehelin J., Megretskaia I. A., Cammas J. P., Thouret V., Claude H., De Backer H., Steinbacher M., Scheel H. E., Stuebi R., Froehlich M., Derwent R., Harvard John A. Paulson School of Engineering and Applied Sciences (SEAS), Harvard University [Cambridge], Institute for Atmospheric and Climate Science [Zürich] (IAC), Eidgenössische Technische Hochschule - Swiss Federal Institute of Technology [Zürich] (ETH Zürich), Ozone et Précurseurs (O3P ), Laboratoire d'aérologie (LAERO), Centre National de la Recherche Scientifique (CNRS)-Observatoire Midi-Pyrénées (OMP), Météo France-Centre National d'Études Spatiales [Toulouse] (CNES)-Université Fédérale Toulouse Midi-Pyrénées-Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche pour le Développement (IRD)-Météo France-Centre National d'Études Spatiales [Toulouse] (CNES)-Université Fédérale Toulouse Midi-Pyrénées-Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche pour le Développement (IRD)-Université Toulouse III - Paul Sabatier (UT3), Université Fédérale Toulouse Midi-Pyrénées-Centre National de la Recherche Scientifique (CNRS)-Observatoire Midi-Pyrénées (OMP), Université Fédérale Toulouse Midi-Pyrénées, Meteorologisches Observatorium Hohenpeißenberg (MOHp), Deutscher Wetterdienst [Offenbach] (DWD), Institut Royal Météorologique de Belgique [Bruxelles] (IRM), Laboratory of Air Pollution and Environmental Technology, Swiss Federal Laboratories for Materials Science and Technology [Thun] (EMPA), Institut für Meteorologie und Klimaforschung - Atmosphärische Umweltforschung (IMK-IFU), Karlsruher Institut für Technologie (KIT), Payerne Aerological Station, Federal Office of Meteorology and Climatology MeteoSwiss, Air Pollution Control and Climate Change Mitigation, Environment Agency Austria, Rdscientific [Newbury], Harvard University, Université Toulouse III - Paul Sabatier (UT3), Université de Toulouse (UT)-Université de Toulouse (UT)-Observatoire Midi-Pyrénées (OMP), Institut de Recherche pour le Développement (IRD)-Université Toulouse III - Paul Sabatier (UT3), Université de Toulouse (UT)-Université de Toulouse (UT)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National d'Études Spatiales [Toulouse] (CNES)-Centre National de la Recherche Scientifique (CNRS)-Météo-France -Institut de Recherche pour le Développement (IRD)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National d'Études Spatiales [Toulouse] (CNES)-Centre National de la Recherche Scientifique (CNRS)-Météo-France -Centre National de la Recherche Scientifique (CNRS)-Université Toulouse III - Paul Sabatier (UT3), Université de Toulouse (UT)-Université de Toulouse (UT)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National d'Études Spatiales [Toulouse] (CNES)-Centre National de la Recherche Scientifique (CNRS)-Météo-France -Institut de Recherche pour le Développement (IRD)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National d'Études Spatiales [Toulouse] (CNES)-Centre National de la Recherche Scientifique (CNRS)-Météo-France -Centre National de la Recherche Scientifique (CNRS), Institut Royal Météorologique de Belgique [Bruxelles] - Royal Meteorological Institute (IRM), Laboratory for Air Pollution/Environmental Technology, Swiss Federal Laboratories for Materials Science and Technology [Dübendorf] (EMPA), and Umweltbundesamt GmbH = Environment Agency Austria

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

International audience; We use ozone observations from sondes, regular aircraft, and alpine surface sites in a self-consistent analysis to determine robust changes in the time evolution of ozone over Europe. The data are most coherent since 1998, with similar interannual variability and trends. Ozone has decreased slowly since 1998, with an annual mean trend of −0.15 ppb yr−1 at ∼3 km and the largest decrease in summer. There are some substantial differences between the sondes and other data, particularly in the early 1990s. The alpine and aircraft data show that ozone increased from late 1994 until 1998, but the sonde data do not. Time series of differences in ozone between pairs of locations reveal inconsistencies in various data sets. Differences as small as few ppb for 2-3 years lead to different trends for 1995-2008, when all data sets overlap. Sonde data from Hohenpeissenberg and in situ data from nearby Zugspitze show ozone increased by ∼1 ppb yr−1 during 1978-1989. We construct a mean alpine time series using data for Jungfraujoch, Zugspitze, and Sonnblick. Using Zugspitze data for 1978-1989, and the mean time series since 1990, we find that the ozone increased by 6.5-10 ppb in 1978-1989 and 2.5-4.5 ppb in the 1990s and decreased by 4 ppb in the 2000s in summer with no significant changes in other seasons. It is hard to reconcile all these changes with trends in emissions of ozone precursors, and in ozone in the lowermost stratosphere. We recommend data sets that are suitable for evaluation of model hindcasts.

Published
2012

10. Characterization and intercomparison of aerosol absorption photometers: result of two intercomparison workshops

Author

Mika Komppula, G. Jennings, Hristo Angelov, Aki Virkkula, Thomas Müller, S. Rodriquez, Yang Wang, Angela Marinoni, John A. Ogren, Marcel M. Moerman, Nikos Kalivitis, Kornélia Imre, Andreas Petzold, Jean-Marc Pichon, Mar Viana, Paolo Laj, P. Ivanow, Kimmo Teinilä, Andrés Alastuey, Chris Rene Lunder, András Hoffer, R. Wilhelm, A. Wiedensohler, H. Karlsson, S. Martins dos Santos, Ernest Weingartner, Junying Sun, G. de Leeuw, Risto Hillamo, Andreas Nowak, Patrick J. Sheridan, J. E. Engström, Thomas Tuch, Sangeeta Sharma, Shao-Meng Li, M. Bizjak, J. S. Henzing, Carsten Gruening, M. Collaud Coen, Leibniz-Institut für Troposphärenforschung (TROPOS), Netherlands Organization for Applied Scientific Research (TNO), TNO Science and Industry, University of Helsinki, Finnish Meteorological Institute (FMI), Institute of Environmental Assessment and Water Research (IDAEA), Consejo Superior de Investigaciones Científicas [Spain] (CSIC), Institute for Nuclear Research and Nuclear Energy, Bulgarian Academy of Sciences (BAS), Faculty of Health Sciences, University of Ljubljana, Payerne Aerological Station, Federal Office of Meteorology and Climatology MeteoSwiss, Department of Meteorology [Stockholm] (MISU), Stockholm University, European Commission - Joint Research Centre [Ispra] (JRC), Department of Earth and Environmental Sciences [Veszprém], University of Pannonia, Environmental Change Institute [Galway], National University of Ireland [Galway] (NUI Galway), School of Physics [NUI Galway], Environmental Chemical Processes Laboratory [Heraklion] (ECPL), Department of Chemistry [Heraklion], University of Crete [Heraklion] (UOC)-University of Crete [Heraklion] (UOC), Institute for Applied Environmental Research [Stockholm], Kuopio Unit [FMI], Laboratoire de glaciologie et géophysique de l'environnement (LGGE), Observatoire des Sciences de l'Univers de Grenoble (OSUG), Université Savoie Mont Blanc (USMB [Université de Savoie] [Université de Chambéry])-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP)-Institut national de recherche en sciences et technologies pour l'environnement et l'agriculture (IRSTEA)-Université Joseph Fourier - Grenoble 1 (UJF)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-Université Grenoble Alpes (UGA)-Université Savoie Mont Blanc (USMB [Université de Savoie] [Université de Chambéry])-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP)-Institut national de recherche en sciences et technologies pour l'environnement et l'agriculture (IRSTEA)-Université Joseph Fourier - Grenoble 1 (UJF)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-Université Grenoble Alpes (UGA)-Centre National de la Recherche Scientifique (CNRS), Laboratoire de météorologie physique (LaMP), Centre National de la Recherche Scientifique (CNRS)-Institut national des sciences de l'Univers (INSU - CNRS)-Université Blaise Pascal - Clermont-Ferrand 2 (UBP), Norwegian Institute for Air Research (NILU), CNR Institute of Atmospheric Sciences and Climate (ISAC), Consiglio Nazionale delle Ricerche (CNR), The Netherlands Organisation for Applied Scientific Research (TNO), Leibniz Institute for Tropospheric Research (TROPOS), ESRL Global Monitoring Division [Boulder] (GMD), NOAA Earth System Research Laboratory (ESRL), National Oceanic and Atmospheric Administration (NOAA)-National Oceanic and Atmospheric Administration (NOAA), DLR Institut für Physik der Atmosphäre (IPA), Deutsches Zentrum für Luft- und Raumfahrt [Oberpfaffenhofen-Wessling] (DLR), Laboratory of Atmospheric Chemistry [Paul Scherrer Institute] (LAC), Paul Scherrer Institute (PSI), Meteorologisches Observatorium Hohenpeißenberg (MOHp), Deutscher Wetterdienst [Offenbach] (DWD), Chinese Academy of Meteorological Sciences (CAMS), WMO GAW (Global Atmosphere Watch) EU, Consejo Superior de Investigaciones Científicas [Madrid] (CSIC), Centre National de la Recherche Scientifique (CNRS)-Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire des Sciences de l'Univers de Grenoble (OSUG), Université Joseph Fourier - Grenoble 1 (UJF)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Institut national des sciences de l'Univers (INSU - CNRS)-Institut national de recherche en sciences et technologies pour l'environnement et l'agriculture (IRSTEA)-Université Savoie Mont Blanc (USMB [Université de Savoie] [Université de Chambéry])-Centre National de la Recherche Scientifique (CNRS)-Université Joseph Fourier - Grenoble 1 (UJF)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Institut national de recherche en sciences et technologies pour l'environnement et l'agriculture (IRSTEA)-Université Savoie Mont Blanc (USMB [Université de Savoie] [Université de Chambéry])-Centre National de la Recherche Scientifique (CNRS), Centre National de la Recherche Scientifique (CNRS)-Université Blaise Pascal - Clermont-Ferrand 2 (UBP)-Institut national des sciences de l'Univers (INSU - CNRS), ESRL Global Monitoring Laboratory [Boulder] (GML), Helsingin yliopisto = Helsingfors universitet = University of Helsinki, Université Joseph Fourier - Grenoble 1 (UJF)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Institut national des sciences de l'Univers (INSU - CNRS)-Institut national de recherche en sciences et technologies pour l'environnement et l'agriculture (IRSTEA)-Université Savoie Mont Blanc (USMB [Université de Savoie] [Université de Chambéry])-Centre National de la Recherche Scientifique (CNRS)-Université Joseph Fourier - Grenoble 1 (UJF)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Institut national des sciences de l'Univers (INSU - CNRS)-Institut national de recherche en sciences et technologies pour l'environnement et l'agriculture (IRSTEA)-Université Savoie Mont Blanc (USMB [Université de Savoie] [Université de Chambéry])-Centre National de la Recherche Scientifique (CNRS)-Centre National de la Recherche Scientifique (CNRS), Université Blaise Pascal - Clermont-Ferrand 2 (UBP)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS), and National Research Council of Italy | Consiglio Nazionale delle Ricerche (CNR)

Subjects
Atmospheric Science, 010504 meteorology & atmospheric sciences, Integrating Nephelometers, aerosol absorption, aerosol properties, aerosol measurement, Fotómetros de absorción, 010501 environmental sciences, medicine.disease_cause, black carbon, soot, 01 natural sciences, law.invention, Size, law, Soot Particles, Aerosoles, lcsh:TA170-171, Absorption (electromagnetic radiation), Chemistry, lcsh:Earthwork. Foundations, Soot, lcsh:Environmental engineering, aerosol climate, Black Carbon Content, Calibration, Filter-Based Measurements, MAAP, photometers, Absorption photometers, Aethalometer, intercomparison, Optics, EUSAAR, medicine, [SDU.STU.GM]Sciences of the Universe [physics]/Earth Sciences/Geomorphology, effects, Attenuation Cross-Section, Remote sensing, 0105 earth and related environmental sciences, Photometers, business.industry, lcsh:TA715-787, Ambient Measurements, Aerosol properties, Atmosphärische Spurenstoffe, Photometer, Aerosol, 13. Climate action, Attenuation coefficient, Particle, Visible-Light Absorption, business, absorption
Abstract

Absorption photometers for real time application have been available since the 1980s, but the use of filter-based instruments to derive information on aerosol properties (absorption coefficient and black carbon, BC) is still a matter of debate. Several workshops have been conducted to investigate the performance of individual instruments over the intervening years. Two workshops with large sets of aerosol absorption photometers were conducted in 2005 and 2007. The data from these instruments were corrected using existing methods before further analysis. The inter-comparison shows a large variation between the responses to absorbing aerosol particles for different types of instruments. The unit to unit variability between instruments can be up to 30% for Particle Soot Absorption Photometers (PSAPs) and Aethalometers. Multi Angle Absorption Photometers (MAAPs) showed a variability of less than 5%. Reasons for the high variability were identified to be variations in sample flow and spot size. It was observed that different flow rates influence system performance with respect to response to absorption and instrumental noise. Measurements with non absorbing particles showed that the current corrections of a cross sensitivity to particle scattering are not sufficient. Remaining cross sensitivities were found to be a function of the total particle load on the filter. The large variation between the response to absorbing aerosol particles for different types of instruments indicates that current correction functions for absorption photometers are not adequate., JRC.DDG.H.2-Climate change and air quality

Published
2011

11. Extreme events in total ozone over Arosa – Part 2: Fingerprints of atmospheric dynamics and chemistry and effects on mean values and long-term changes

Author

F. Holawe, Philipp Weihs, Harald E. Rieder, Mathieu Ribatet, J. A. Maeder, René Stübi, Johannes Staehelin, Anthony C. Davison, Th. Peter, Institute for Atmospheric and Climate Science [Zürich] (IAC), Eidgenössische Technische Hochschule - Swiss Federal Institute of Technology [Zürich] (ETH Zürich), Institut de Mathématiques et de Modélisation de Montpellier (I3M), Centre National de la Recherche Scientifique (CNRS)-Université Montpellier 2 - Sciences et Techniques (UM2)-Université de Montpellier (UM), Département de Mathématiques - EPFL, Ecole Polytechnique Fédérale de Lausanne (EPFL), Payerne Aerological Station, Federal Office of Meteorology and Climatology MeteoSwiss, Institute for Meteorology and Climatology [Vienna] (BOKU-Met), University of Natural Resources and Life Sciences (BOKU), and Institute for Geography and Regional Research

Subjects
Atmospheric Science, Ozone, 010504 meteorology & atmospheric sciences, Climate change, Atmospheric sciences, 01 natural sciences, lcsh:Chemistry, chemistry.chemical_compound, 010104 statistics & probability, Polar vortex, Time series, [MATH]Mathematics [math], 0101 mathematics, Extreme value theory, ComputingMilieux_MISCELLANEOUS, 0105 earth and related environmental sciences, geography, geography.geographical_feature_category, Northern Hemisphere, lcsh:QC1-999, Volcano, chemistry, lcsh:QD1-999, North Atlantic oscillation, 13. Climate action, Climatology, lcsh:Physics
Abstract

In this study the frequency of days with extreme low (termed ELOs) and extreme high (termed EHOs) total ozone values and their influence on mean values and trends are analyzed for the world's longest total ozone record (Arosa, Switzerland). The results show (a) an increase in ELOs and (b) a decrease in EHOs during the last decades and (c) that the overall trend during the 1970s and 1980s in total ozone is strongly dominated by changes in these extreme events. After removing the extremes, the time series shows a strongly reduced trend (reduction by a factor of 2.5 for trend in annual mean). Excursions in the frequency of extreme events reveal "fingerprints" of dynamical factors such as ENSO or NAO, and chemical factors, such as cold Arctic vortex ozone losses, as well as major volcanic eruptions of the 20th century (Gunung Agung, El Chichón, Mt. Pinatubo). Furthermore, atmospheric loading of ozone depleting substances leads to a continuous modification of column ozone in the Northern Hemisphere also with respect to extreme values (partly again in connection with polar vortex contributions). Application of extreme value theory allows the identification of many more such "fingerprints" than conventional time series analysis of annual and seasonal mean values. The analysis shows in particular the strong influence of dynamics, revealing that even moderate ENSO and NAO events have a discernible effect on total ozone. Overall the approach to extremal modelling provides new information on time series properties, variability, trends and the influence of dynamics and chemistry, complementing earlier analyses focusing only on monthly (or annual) mean values.

Published
2010

12. A trajectory-based estimate of the tropospheric ozone column using the residual method

Author

Hennie Kelder, S. Chandra, Pieternel F. Levelt, Holger Vömel, E. Joseph, Esko Kyrö, S. J. Oltmans, Valery Dorokhov, Anne M. Thompson, Lucien Froidevaux, David J. Moore, Signe B. Andersen, John T. Merrill, Gérard Ancellet, René Stübi, Susan E. Strahan, P. Viatte, Jonathan Davies, Georg Hansen, Masatomo Fujiwara, B. Bojkov, Nathaniel J. Livesey, P. von der Gathen, Gert J. R. Coetzee, H. De Backer, G. Koenig-Langlo, Bryan N. Duncan, P. Skrivankova, Hans Claude, David W. Tarasick, Pawan K. Bhartia, Greg Bodeker, Gary A. Morris, Sophie Godin-Beekmann, Margarita Yela, Jacquelyn C. Witte, H. Dier, Beverly J. Johnson, Marc Allaart, M. C. Parrondos, Bertrand Calpini, Emilio Cuevas, G. Zablocki, Susan S. Kulawik, Françoise Posny, Mark R. Schoeberl, Michael J. Newchurch, F. J. Schmidlin, Alberto Redondas, C. P. Leong, Jerald R. Ziemke, Valérie Thouret, NASA Goddard Space Flight Center (GSFC), Goddard Earth Sciences and Technology Center (GEST), University of Maryland [Baltimore County] (UMBC), University of Maryland System-University of Maryland System, Jet Propulsion Laboratory (JPL), NASA-California Institute of Technology (CALTECH), Royal Netherlands Meteorological Institute (KNMI), Science Systems and Applications, Inc. [Lanham] (SSAI), PennState Meteorology Department, Pennsylvania State University (Penn State), Penn State System-Penn State System, Izaña Atmospheric Research Center (IARC), Agencia Estatal de Meteorología (AEMet), Environment Canada (Downsview), National Institute of Water and Atmospheric Research [Lauder] (NIWA), Norwegian Institute for Air Research (NILU), NOAA Earth System Research Laboratory (ESRL), National Oceanic and Atmospheric Administration (NOAA), Cooperative Institute for Research in Environmental Sciences (CIRES), University of Colorado [Boulder]-National Oceanic and Atmospheric Administration (NOAA), Department of Atmospheric Science [Huntsville], University of Alabama in Huntsville (UAH), Service d'aéronomie (SA), Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Université Pierre et Marie Curie - Paris 6 (UPMC)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS), Meteorologisches Observatorium Hohenpeißenberg (MOHp), Deutscher Wetterdienst [Offenbach] (DWD), Danish Meteorological Institute (DMI), Arctic Research Centre of Finnish Meteorological Institute, Finnish Meteorological Institute (FMI), Laboratorio de Atmosfera [Madrid], Spanish Space Agency, Centre of Aerology [Poland], Institute of Meteorology and Water Management - National Research Institute (IMGW - PIB), United Kingdom Met Office [Exeter], Lindenberg Meteorological Observatory - Richard Assmann Observatory (MOL-RAO), Alfred-Wegener-Institut, Helmholtz-Zentrum für Polar- und Meeresforschung (AWI), Payerne Aerological Station, Federal Office of Meteorology and Climatology MeteoSwiss, Czech Hydrometeorological Institute (CHMI), Central Aerological Observatory (CAO), Russian Federal Service for Hydrometeorology and Environmental Monitoring (Roshydromet), Institut Royal Météorologique de Belgique [Bruxelles] - Royal Meteorological Institute (IRM), Department of Environmental Affairs and Tourism, Marine and Coastal Management, South African Government, Graduate School of Environmental Science [Sapporo], Hokkaido University [Sapporo, Japan], Laboratoire d'aérologie (LAERO), Université Toulouse III - Paul Sabatier (UT3), Université de Toulouse (UT)-Université de Toulouse (UT)-Observatoire Midi-Pyrénées (OMP), Institut de Recherche pour le Développement (IRD)-Université Toulouse III - Paul Sabatier (UT3), Université de Toulouse (UT)-Université de Toulouse (UT)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National d'Études Spatiales [Toulouse] (CNES)-Centre National de la Recherche Scientifique (CNRS)-Météo-France -Institut de Recherche pour le Développement (IRD)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National d'Études Spatiales [Toulouse] (CNES)-Centre National de la Recherche Scientifique (CNRS)-Météo-France -Centre National de la Recherche Scientifique (CNRS), Laboratoire de physique de l'atmosphère (LPA), Institut national des sciences de l'Univers (INSU - CNRS)-Université de La Réunion (UR)-Centre National de la Recherche Scientifique (CNRS), Department of Physics and Astronomy [Valparaiso], Valparaiso University, Graduate School of Oceanography [Narragansett], University of Rhode Island (URI), Malaysian Meteorological Department (MetMalaysia), Ministry of Science, Technology and Innovation [Malaysia] (MOSTI), Howard University, Institut Royal Météorologique de Belgique [Bruxelles] (IRM), Centre National de la Recherche Scientifique (CNRS)-Observatoire Midi-Pyrénées (OMP), Météo France-Centre National d'Études Spatiales [Toulouse] (CNES)-Université Fédérale Toulouse Midi-Pyrénées-Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche pour le Développement (IRD)-Météo France-Centre National d'Études Spatiales [Toulouse] (CNES)-Université Fédérale Toulouse Midi-Pyrénées-Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche pour le Développement (IRD)-Université Toulouse III - Paul Sabatier (UT3), Université Fédérale Toulouse Midi-Pyrénées, and Fluids and Flows

Subjects
Atmospheric Science, Residual method, 010504 meteorology & atmospheric sciences, Microwave Limb Sounder, Soil Science, 010501 environmental sciences, Aquatic Science, Oceanography, Atmospheric sciences, 01 natural sciences, Troposphere, chemistry.chemical_compound, Geochemistry and Petrology, Earth and Planetary Sciences (miscellaneous), pollution, Tropospheric ozone, Stratosphere, 0105 earth and related environmental sciences, Earth-Surface Processes, Water Science and Technology, Ozone Monitoring Instrument, tropospheric ozone, [PHYS.PHYS.PHYS-AO-PH]Physics [physics]/Physics [physics]/Atmospheric and Oceanic Physics [physics.ao-ph], Ecology, Paleontology, Forestry, air quality, Geophysics, Tropospheric Emission Spectrometer, chemistry, 13. Climate action, Space and Planetary Science, Climatology, Middle latitudes, Environmental science, Tropospheric column ozone, Tropopause
Abstract

We estimate the tropospheric column ozone using a forward trajectory model to increase the horizontal resolution of the Aura Microwave Limb Sounder (MLS) derived stratospheric column ozone. Subtracting the MLS stratospheric column from Ozone Monitoring Instrument total column measurements gives the trajectory enhanced tropospheric ozone residual (TTOR). Because of different tropopause definitions, we validate the basic residual technique by computing the 200-hPa-to-surface column and comparing it to the same product from ozonesondes and Tropospheric Emission Spectrometer measurements. Comparisons show good agreement in the tropics and reasonable agreement at middle latitudes, but there is a persistent low bias in the TTOR that may be due to a slight high bias in MLS stratospheric column. With the improved stratospheric column resolution, we note a strong correlation of extratropical tropospheric ozone column anomalies with probable troposphere-stratosphere exchange events or folds. The folds can be identified by their colocation with strong horizontal tropopause gradients. TTOR anomalies due to folds may be mistaken for pollution events since folds often occur in the Atlantic and Pacific pollution corridors. We also compare the 200-hPa-to-surface column with Global Modeling Initiative chemical model estimates of the same quantity. While the tropical comparisons are good, we note that chemical model variations in 200-hPa-to-surface column at middle latitudes are much smaller than seen in the TTOR.

Published
2007

13. Arctic winter 2005: Implications for stratospheric ozone loss and climate change

Author

J. Davies, Vladimir Yushkov, A. D. Risley, Z. Litynska, M. Gerding, Karl W. Hoppel, Ross J. Salawitch, Christos Zerefos, Geir O. Braathen, M. C. Parrondo, Hans Claude, P. von der Gathen, David J. Moore, Sophie Godin-Beekmann, Beverly J. Johnson, H. De Backer, P. Skrivankova, H. Dier, Hideaki Nakane, Esko Kyrö, René Stübi, Marc Allaart, H. Fast, Richard M. Bevilacqua, P. Viatte, Valery Dorokhov, Barbara Naujokat, Martyn P. Chipperfield, Signe B. Andersen, Neil R. P. Harris, Markus Rex, E. Reimer, H. Deckelmann, Alfred Wegener Institute for Polar and Marine Research (AWI), Jet Propulsion Laboratory (JPL), NASA-California Institute of Technology (CALTECH), European Ozone Research Coordinating Unit [Cambridge] (EORCU), University of Cambridge [UK] (CAM), School of Earth and Environment [Leeds] (SEE), University of Leeds, Institut für Meteorologie [Berlin], Freie Universität Berlin, Royal Netherlands Meteorological Institute (KNMI), Danish Meteorological Institute (DMI), Naval Research Laboratory (NRL), Norwegian Institute for Air Research (NILU), Meteorologisches Observatorium Hohenpeißenberg (MOHp), Deutscher Wetterdienst [Offenbach] (DWD), Meteorological Service of Canada (MSC), Environment and Climate Change Canada, Institut Royal Météorologique de Belgique [Bruxelles] - Royal Meteorological Institute (IRM), Lindenberg Meteorological Observatory - Richard Assmann Observatory (MOL-RAO), Central Aerological Observatory (CAO), Russian Federal Service for Hydrometeorology and Environmental Monitoring (Roshydromet), Leibniz-Institut für Atmosphärenphysik (IAP), Universität Rostock-Leibniz Association, Service d'aéronomie (SA), 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), NOAA Earth System Research Laboratory (ESRL), National Oceanic and Atmospheric Administration (NOAA), Sodankylä Geophysical Observatory, University of Oulu, Institute of Meteorology and Water Management - National Research Institute (IMGW - PIB), Met Office Hadley Centre for Climate Change (MOHC), United Kingdom Met Office [Exeter], National Institute for Environmental Studies (NIES), Instituto Nacional de Técnica Aeroespacial (INTA), Science Applications International Corporation (SAIC), Czech Hydrometeorological Institute (CHMI), Payerne Aerological Station, Federal Office of Meteorology and Climatology MeteoSwiss, Laboratory of Climatology and Atmospheric Environment [Athens] (LACAE), and National and Kapodistrian University of Athens (NKUA)

Subjects
Arctic sea ice decline, 010504 meteorology & atmospheric sciences, Polar meteorology, Climate change, 010502 geochemistry & geophysics, Atmospheric sciences, Middle atmosphere, 01 natural sciences, Ozone depletion, Arctic geoengineering, Geophysics, Arctic, [SDU]Sciences of the Universe [physics], 13. Climate action, Polar vortex, Climatology, Ozone layer, General Earth and Planetary Sciences, Environmental science, Stratosphere, 0105 earth and related environmental sciences
Abstract

International audience; The Arctic polar vortex exhibited widespread regions of low temperatures during the winter of 2005, resulting in significant ozone depletion by chlorine and bromine species. We show that chemical loss of column ozone (ΔO3) and the volume of Arctic vortex air cold enough to support the existence of polar stratospheric clouds (VPSC) both exceed levels found for any other Arctic winter during the past 40 years. Cold conditions and ozone loss in the lowermost Arctic stratosphere (e.g., between potential temperatures of 360 to 400 K) were particularly unusual compared to previous years. Measurements indicate ΔO3 = 121 +/- 20 DU and that ΔO3 versus VPSC lies along an extension of the compact, near linear relation observed for previous Arctic winters. The maximum value of VPSC during five to ten year intervals exhibits a steady, monotonic increase over the past four decades, indicating that the coldest Arctic winters have become significantly colder, and hence are more conducive to ozone depletion by anthropogenic halogens.

Published
2006

14. Coordinated ground-based validation of ENVISAT atmospheric chemistry with NDSC network data : Commissioning phase report

Author

Lambert, Jean-Christopher, Soebijanta, Vincent, Orsolini, Yvan, Andersen, Signe, Bui Van, André, Burrows, John, Calisesi, Yasmine, Cambridge, Clare, Claude, Hans, de Backer-Barilly, Marie-Renee, de La Noë, Jérôme, de Maziere, Martine, Dorokhov, Valery, Fahre Vik, Aasmund, Godin-Beekmann, Sophie, Goutail, Florence, Hansen, Georg, Hochschild, Gerd, Hoiskar, Britt Ann, Johnston, Paul, Kämpfer, Niklaus, Kreher, Karin, Kyro, Esko, Leveau, Jean, Mader, Jorg, Milinevski, Genadi, Pommereau, Jean-Pierre, Quinn, Paul, Raffalski, Uwe, Richter, Andreas, Roscoe, Howard, Shanklin, Jonathan, Staehelin, Johannes, Stebel, Kerstin, Stubi, Rene, Suortti, Tuomo, Tornkvist, Kjersti, van Roozendael, Michel, Vaughan, Geraint, Wittrock, Folkart, Belgian Institute for Space Aeronomy / Institut d'Aéronomie Spatiale de Belgique (BIRA-IASB), Norwegian Institute for Air Research (NILU), Danish Meteorological Institute (DMI), Instituto de Pesquisas Meteorológicas (IPMet), Universidade Estadual Paulista Júlio de Mesquita Filho = São Paulo State University (UNESP), Institut für Umweltphysik [Bremen] (IUP), Universität Bremen, Institute of Applied Physics [Bern] (IAP), University of Bern, Department of Physics [Aberystwyth], Aberystwyth University, Deutscher Wetterdienst [Offenbach] (DWD), Groupe de spectrométrie moléculaire et atmosphérique (GSMA), Université de Reims Champagne-Ardenne (URCA)-Centre National de la Recherche Scientifique (CNRS), Observatoire aquitain des sciences de l'univers (OASU), Université Sciences et Technologies - Bordeaux 1 (UB)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS), Central Aerological Observatory (CAO), Russian Federal Service for Hydrometeorology and Environmental Monitoring (Roshydromet), Service d'aéronomie (SA), 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), Institute for Meteorology and Climate Research (IMK), Karlsruhe Institute of Technology (KIT), National Institute of Water and Atmospheric Research [Lauder] (NIWA), Finnish Meteorological Institute (FMI), Université de La Réunion (UR), Institute for Atmospheric and Climate Science [Zürich] (IAC), Eidgenössische Technische Hochschule - Swiss Federal Institute of Technology [Zürich] (ETH Zürich), Taras Shevchenko National University of Kyiv, Swedish Institute of Space Physics [Kiruna] (IRF), Institute of Environmental Physics and Remote Sensing [Bremen] (IUP/IFE), University of Bremen, British Antarctic Survey (BAS), Natural Environment Research Council (NERC), Payerne Aerological Station, Federal Office of Meteorology and Climatology MeteoSwiss, H. Lacoste (ed.), 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 the framework of the coordinated project called CINAMON, a list of ground-based stations associated with the Network for the Detection of Stratospheric Change (NDSC) contribute to the quasi-global validation of ENVISAT atmospheric chemistry data. This paper reports on such activities performed during the Commissioning Phase (CP) of the satellite. After a description of the correlative database generated during this period, preliminary ground-based studies relying on this database give a first picture of the quality of SCIAMACHY ozone and nitrogen dioxide columns, and GOMOS and MIPAS ozone profiles. Illustration of the global mapping of MIPAS ozone profile data is also presented. The paper concludes with perspectives for the Main Validation Phase of ENVISAT.

Published
2002

15. Validation of Aura Microwave Limb Sounder Ozone by ozonesonde and lidar measurements

Author

David W. Tarasick, Gert J. R. Coetzee, Hans Claude, P. Skrivankova, F. J. Schmidlin, Sophie Godin-Beekmann, Robert Jarnot, G. Zablocki, R. E. Cofield, Françoise Posny, B. Bojkov, I. S. McDermid, P. Viatte, Michael J. Schwartz, Yan Jiang, Greg Bodeker, R. A. Fuller, Lucien Froidevaux, H. Dier, Hennie Kelder, Nathaniel J. Livesey, Beverly J. Johnson, Thierry Leblanc, Giovanni Laneve, S. J. Oltmans, H. De Backer, Brian Knosp, Marc Allaart, M. C. Parrondos, William H. Daffer, René Stübi, Robert S. Harwood, Michael J. Newchurch, Signe B. Andersen, Gary A. Morris, P. C. Stek, William G. Read, Margarita Yela, Bertrand Calpini, Brian J. Drouin, N. P. Leme, Joe W. Waters, W. V. Snyder, Esko Kyrö, D. T. Cuddy, Gert König-Langlo, Anne M. Thompson, R. P. Thurstans, V. S. Perun, P. von der Gathen, Masatomo Fujiwara, P. A. Wagner, L. S. Fook, Alyn Lambert, John T. Merrill, Holger Vömel, Jonathan Davies, M. J. Filipiak, Valérie Thouret, Jet Propulsion Laboratory (JPL), NASA-California Institute of Technology (CALTECH), NASA Goddard Space Flight Center (GSFC), Service d'aéronomie (SA), 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), Institute of Atmospheric and Environmental Science [Edinburgh], University of Edinburgh, Royal Netherlands Meteorological Institute (KNMI), Danish Meteorological Institute (DMI), Lauder Atmospheric Research Station, National Institute of Water and Atmospheric Research [Auckland] (NIWA), Payerne Aerological Station, Federal Office of Meteorology and Climatology MeteoSwiss, Meteorologisches Observatorium Hohenpeißenberg (MOHp), Deutscher Wetterdienst [Offenbach] (DWD), South African Weather Service (SAWS), Environment and Climate Change Canada, Institut Royal Météorologique de Belgique [Bruxelles] (IRM), Lindenberg Meteorological Observatory - Richard Assmann Observatory (MOL-RAO), Graduate School of Environmental Science [Sapporo], Hokkaido University [Sapporo, Japan], NOAA Earth System Research Laboratory (ESRL), National Oceanic and Atmospheric Administration (NOAA), Instituto Nacional de Pesquisas Espaciais (INPE), Ministério da Ciência, Tecnologia e Inovação, Finnish Meteorological Institute (FMI), Centro di Ricerca Progetto San Marco (CRPSM), Università degli Studi di Roma 'La Sapienza' = Sapienza University [Rome], Malaysian Meteorological Department (MetMalaysia), Ministry of Science, Technology and Innovation [Malaysia] (MOSTI), Graduate School of Oceanography [Narragansett], University of Rhode Island (URI), Department of Physics and Astronomy [Valparaiso], Valparaiso University, Department of Atmospheric Science [Huntsville], University of Alabama in Huntsville (UAH), Instituto Nacional de Técnica Aeroespacial (INTA), Laboratoire de l'Atmosphère et des Cyclones (LACy), Centre National de la Recherche Scientifique (CNRS)-Université de La Réunion (UR)-Institut national des sciences de l'Univers (INSU - CNRS)-Météo France, Czech Hydrometeorological Institute (CHMI), PennState Meteorology Department, Pennsylvania State University (Penn State), Penn State System-Penn State System, Laboratoire d'aérologie (LAERO), Centre National de la Recherche Scientifique (CNRS)-Observatoire Midi-Pyrénées (OMP), Météo France-Centre National d'Études Spatiales [Toulouse] (CNES)-Université Fédérale Toulouse Midi-Pyrénées-Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche pour le Développement (IRD)-Météo France-Centre National d'Études Spatiales [Toulouse] (CNES)-Université Fédérale Toulouse Midi-Pyrénées-Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche pour le Développement (IRD)-Université Toulouse III - Paul Sabatier (UT3), Université Fédérale Toulouse Midi-Pyrénées, Cooperative Institute for Research in Environmental Sciences (CIRES), University of Colorado [Boulder]-National Oceanic and Atmospheric Administration (NOAA), Institute of Meteorology and Water Management - National Research Institute (IMGW - PIB), Institut Royal Météorologique de Belgique [Bruxelles] - Royal Meteorological Institute (IRM), Università degli Studi di Roma 'La Sapienza' = Sapienza University [Rome] (UNIROMA), Institut national des sciences de l'Univers (INSU - CNRS)-Université de La Réunion (UR)-Centre National de la Recherche Scientifique (CNRS)-Météo-France, Université Toulouse III - Paul Sabatier (UT3), Université de Toulouse (UT)-Université de Toulouse (UT)-Observatoire Midi-Pyrénées (OMP), Institut de Recherche pour le Développement (IRD)-Université Toulouse III - Paul Sabatier (UT3), and Université de Toulouse (UT)-Université de Toulouse (UT)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National d'Études Spatiales [Toulouse] (CNES)-Centre National de la Recherche Scientifique (CNRS)-Météo-France -Institut de Recherche pour le Développement (IRD)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National d'Études Spatiales [Toulouse] (CNES)-Centre National de la Recherche Scientifique (CNRS)-Météo-France -Centre National de la Recherche Scientifique (CNRS)

Subjects
Atmospheric Science, 010504 meteorology & atmospheric sciences, ozonesonde, 0211 other engineering and technologies, Soil Science, 02 engineering and technology, Aquatic Science, Oceanography, 01 natural sciences, MLS, Troposphere, chemistry.chemical_compound, Altitude, Geochemistry and Petrology, Ozone layer, Earth and Planetary Sciences (miscellaneous), Tropospheric ozone, Stratosphere, 021101 geological & geomatics engineering, 0105 earth and related environmental sciences, Earth-Surface Processes, Water Science and Technology, validation, [PHYS.PHYS.PHYS-AO-PH]Physics [physics]/Physics [physics]/Atmospheric and Oceanic Physics [physics.ao-ph], Ecology, Paleontology, Forestry, Microwave Limb Sounder, ozone, Geophysics, Lidar, chemistry, 13. Climate action, Space and Planetary Science, Climatology, Middle latitudes, Environmental science, Aura
Abstract

We present validation studies of MLS version 2.2 upper tropospheric and stratospheric ozone profiles using ozonesonde and lidar data as well as climatological data. Ozone measurements from over 60 ozonesonde stations worldwide and three lidar stations are compared with coincident MLS data. The MLS ozone stratospheric data between 150 and 3 hPa agree well with ozonesonde measurements, within 8% for the global average. MLS values at 215 hPa are biased high compared to ozonesondes by A`20% at middle to high latitude, although there is a lot of variability in this altitude region. Comparisons between MLS and ground-based lidar measurements from Mauna Loa, Hawaii, from the Table Mountain Facility, California, and from the Observatoire de Haute-Provence, France, give very good agreement, within A`5%, for the stratospheric values. The comparisons between MLS and the Table Mountain Facility tropospheric ozone lidar show that MLS data are biased high by A`30% at 215 hPa, consistent with that indicated by the ozonesonde data. We obtain better global average agreement between MLS and ozonesonde partial column values down to 215 hPa, although the average MLS values at low to middle latitudes are higher than the ozonesonde values by up to a few percent. MLS v2.2 ozone data agree better than the MLS v1.5 data with ozonesonde and lidar measurements. MLS tropical data show the wave one longitudinal pattern in the upper troposphere, with similarities to the average distribution from ozonesondes. High upper tropospheric ozone values are also observed by MLS in the tropical Pacific from June to November.

Published
2007

16. Saharan dust events at the Jungfraujoch: detection by wavelength dependence of the single scattering albedo and first climatology analysis

Author

Coen, Mc, Ernest Weingartner, Schaub, D., Hueglin, C., Corrigan, C., Henning, S., Schwikowski, M., Baltensperger, U., Payerne Aerological Station, Federal Office of Meteorology and Climatology MeteoSwiss, Laboratory of Atmospheric Chemistry [Paul Scherrer Institute] (LAC), Paul Scherrer Institute (PSI), Swiss Federal Laboratories for Materials Testing and Research, University of California [San Diego] (UC San Diego), University of California, Chemical Institute, and Laboratory of Radio- and Environmental Chemistry

Subjects
[SDU.OCEAN]Sciences of the Universe [physics]/Ocean, Atmosphere
Abstract

International audience; Scattering and absorption coefficients have been measured continuously at several wavelengths since March 2001 at the high altitude site Jungfraujoch (3580ma.s.l.). From these data, the wavelength dependences of the Ångström exponent and particularly of the single scattering albedo are determined. While the exponent of the single scattering albedo usually increases with wavelength, it decreases with wavelength during Saharan dust events (SDE) due to the greater size of the mineral aerosol particles and their different chemical composition. This change in the sign of the single scattering exponent turns out to be a sensitive means for detecting Saharan dust events. The occurrence of SDE detected by this new method was confirmed by visual inspection of filter colors and by studying long-range back-trajectories. An examination of SDE over a 22-month period shows that SDE are more frequent during the March-June period as well as during October and November. The trajectory analysis indicated a mean traveling time of 96.5h, with the most important source countries situated in the northern and north-western part of the Saharan desert. Most of the SDE do not lead to a detectable increase of the 48-h total suspended particulate matter (TSP) concentration at the Jungfraujoch. During Saharan dust events, the average contribution of this dust to hourly TSP at the Jungfraujoch is 16µg/m3, which corresponds to an annual mean of 0.8µg/m3 or 24% of TSP.

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

Author

Hubert D, Lambert JC, Verhoelst T, Granville J, Keppens A, Baray JL, Cortesi U, Degenstein DA, Froidevaux L, Godin-Beekmann S, Hoppel KW, Kyrölä E, Leblanc T, Lichtenberg G, McElroy CT, Murtagh D, Nakane H, Querel R, Russell JM 3rd, Salvador J, Smit HGJ, Stebel K, Steinbrecht W, Strawbridge KB, Stübi R, Swart DPJ, Taha G, Thompson AM, Urban J, van Gijsel JAE, von der Gathen P, Walker KA, Wolfram E, and Zawodny JM

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 fourteen 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 20-40 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% decade -1 (or even ±3 % decade -1 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 repercussions of our findings for the construction, analysis and interpretation of merged data records. Most notably, the discrepancies between several recent ozone profile trend assessments can be mostly explained by instrumental drift. This clearly demonstrates the need for systematic comprehensive multi-instrument comparison analyses.

Published
2016
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