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1. Ground-based Assessment of the First Year of Sentinel-5p Tropospheric Ozone Data

Author

Hubert, Daan, Keppen, Arno, Verhoelst, Tijl, Granville, José, Lambert, Jean-Christopher, Heue, Klaus-Peter, Pedergnana, Mattia, Loyola, Diego, Eichmann, Kai-Uwe, Weber, Mark, Apituley, Arnoud, Sneep, Maarten, Tuinder, Olaf, Veefkind, Pepijn, Thompson, Anne, Witte, Jacquelyn, Johnson, Bryan, Vömel, Holger, Selkirk, Henry, Piters, Ankie, Da Silva, Francisco, Mohamad, Maznorizan, Félix, Christian, Ancellet, Gérard, Delcloo, Andy, Duflot, Valentin, Godin-Beekmann, Sophie, Leblanc, Thierry, Steinbrecht, Wolfgang, Stübi, René, Belgian Institute for Space Aeronomy / Institut d'Aéronomie Spatiale de Belgique (BIRA-IASB), DLR Institut für Methodik der Fernerkundung / DLR Remote Sensing Technology Institute (IMF), Deutsches Zentrum für Luft- und Raumfahrt [Oberpfaffenhofen-Wessling] (DLR), Institut für Umweltphysik [Bremen] (IUP), Universität Bremen, Royal Netherlands Meteorological Institute (KNMI), NASA Goddard Space Flight Center (GSFC), Science Systems and Applications, Inc. [Lanham] (SSAI), NOAA Earth System Research Laboratory (ESRL), National Oceanic and Atmospheric Administration (NOAA), National Center for Atmospheric Research [Boulder] (NCAR), Universities Space Research Association (USRA), Laboratory of Environmental and Tropical Variables [Natal], Instituto Nacional de Pesquisas Espaciais (INPE), Malaysian Meteorological Department (MetMalaysia), Ministry of Science, Technology and Innovation [Malaysia] (MOSTI), Federal Office of Meteorology and Climatology MeteoSwiss, TROPO - LATMOS, Laboratoire Atmosphères, Milieux, Observations Spatiales (LATMOS), Sorbonne Université (SU)-Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Centre National de la Recherche Scientifique (CNRS)-Institut national des sciences de l'Univers (INSU - CNRS)-Sorbonne Université (SU)-Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Centre National de la Recherche Scientifique (CNRS)-Institut national des sciences de l'Univers (INSU - CNRS), Institut Royal Météorologique de Belgique [Bruxelles] (IRM), 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, STRATO - LATMOS, Jet Propulsion Laboratory (JPL), California Institute of Technology (CALTECH)-NASA, Meteorologisches Observatorium Hohenpeißenberg (MOHp), Deutscher Wetterdienst [Offenbach] (DWD), and Cardon, Catherine

Subjects
[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, [SDU.OCEAN] Sciences of the Universe [physics]/Ocean, Atmosphere, [PHYS.PHYS.PHYS-AO-PH] Physics [physics]/Physics [physics]/Atmospheric and Oceanic Physics [physics.ao-ph]
Abstract

International audience; Tropospheric ozone is a pollutant that damages ecosystems and triggers human health problems. Ozone concentrations are highly variable over time and across the troposphere, which poses clear challenges to deepen our understanding of the processes involved in the production and transport of ozone. Further progress depends on the availability of instruments capable of measuring tropospheric ozone and its distribution at finer spatio-temporal scales. The TROPOMI instrument on the Sentinel-5p platform, launched into an early afternoon polar orbit in October 2017, combines a high spatial resolution, a large swath width and the spectral measurement characteristics required to deliver tropospheric ozone data records at unprecedented detail. The first of these products was released during Fall 2018. It consists in 0.5° (latitude) by 1° (longitude) resolved daily maps of 3-day moving mean values of the tropospheric ozone column between 20°S and 20°N, and it is computed using the convective-cloud method (CCD). A second data product consists in maps of tropical upper tropospheric ozone mixing ratio at a coarser spatial and temporal resolution. It is based on a cloud slicing algorithm (CSA), which is currently being fine-tuned for release in the very near future. A third data product, also under development at the time of this abstract, consists of the vertical profile of ozone concentration in the global troposphere and stratosphere, retrieved with the classical Optimal Estimation (OE) technique. We present here an assessment of the quality of the first year of the different tropospheric ozone column data sets retrieved from Sentinel-5p TROPOMI measurements, carried out within the context of ESA’s Sentinel-5p Mission Performance Center (MPC) and the S5PVT AO project CHEOPS-5p (Validation of Copernicus Height-resolved Ozone data Products from Sentinel-5p TROPOMI using global sonde and lidar networks, #28587). The first stage of this analysis consists of an inspection of the tropospheric ozone fields for structures which are potentially introduced in the measurement process. Sampling effects, in particular, are a possible source of uncertainty as the CCD product is derived from binned TROPOMI total ozone column data. Another structure introduced by retrieval assumptions would be the dependence of the quality of Sentinel-5p retrieved total column data to cloud parameters. In a second stage the satellite data are confronted to quality-assured ozonesonde and –tentatively– ground-based lidar measurements from the NDACC, SHADOZ and TOLNET networks. These well-characterized observational data records serve as a reference to evaluate the bias and uncertainty of the Sentinel-5p data, and their dependence on influence quantities. The study concludes with an assessment of the compliance of Sentinel-5p tropospheric ozone data with respect to mission and user requirements for key data applications.

Published
2019

2. Tropospheric Ozone Assessment Report: Database and Metrics Data of Global Surface Ozone Observations

Author

Schultz, Martin G., Schröder, Sabine, Lyapina, Olga, Cooper, Owen, Galbally, Ian, Petropavlovskikh, Irina, von Schneidemesser, Erika, Tanimoto, Hiroshi, Elshorbany, Yasin, Naja, Ma, Seguel, Rodrigo, Dauert, Ute, Eckhardt, Paul, Feigenspahn, Stefan, Fiebig, Ma, Hjellbrekke, Anne-Gunn, Hong, You-Deog, Christian Kjeld, Peter, Koide, Hiroshi, Lear, Gary, Tarasick, David, Ueno, Mikio, Wallasch, Ma, Baumgardner, Darrel, Chuang, Ming-Tung, Gillett, Robert, Lee, Meehye, Molloy, Suzie, Moolla, Raeesa, Wang, Tao, Sharps, Katrina, Adame, Jose A., Ancellet, Gérard, Apadula, Francesco, Artaxo, Paul, Barlasina, Ma, Bogucka, Ma, Bonasoni, Paolo, Chang, Limseok, Colomb, Aurélie, Cuevas, Emilio, Cupeiro, Ma, Degorska, Anna, Ding, Aijun, Fröhlich, Ma, Frolova, Ma, Gadhavi, Harish, GHEUSI, François, Gilge, Stefan, Gonzalez, Ma, Gros, Valérie, Hamad, Samera H., Helmig, Detlev, Henriques, Diamantino, Hermansen, Ove, Holla, Robert, Huber, Jacques, Im, Ulas, Jaffe, Daniel A., Komala, Ninong, Kubistin, Dagmar, Lam, Ka-Se, Laurila, Tuomas, Lee, Haeyoung, Levy, Ilan, Mazzoleni, Claudio, Mazzoleni, Lynn, McClure-Begley, Audra, Mohamad, Maznorizan, Murovic, Marijana, Navarro-Comas, M., Nicodim, Florin, Parrish, David, Read, Katie A., Reid, Nick, Ries, Ludwig, Saxena, Pallavi, Schwab, James J., Scorgie, Yvonne, Senik, Irina, Simmonds, Peter, Sinha, Vinayak, Skorokhod, Andrey, Spain, Gerard, Spangl, Wolfgang, Spoor, Ronald, Springston, Stephen R., Steer, Kelvyn, Steinbacher, Martin, Suharguniyawan, Eka, Torre, Paul, Trickl, Thomas, Weili, Lin, Weller, Rolf, Xu, Xiaobin, Xue, Likun, Zhiqiang, Ma, Institut für Energie- und Klimaforschung - Troposphäre (IEK-8), Forschungszentrum Jülich GmbH | Centre de recherche de Juliers, Helmholtz-Gemeinschaft = Helmholtz Association-Helmholtz-Gemeinschaft = Helmholtz Association, Cooperative Institute for Research in Environmental Sciences (CIRES), University of Colorado [Boulder]-National Oceanic and Atmospheric Administration (NOAA), CSIRO Climate Science Centre, Commonwealth Scientific and Industrial Research Organisation [Canberra] (CSIRO), NOAA Earth System Research Laboratory (ESRL), National Oceanic and Atmospheric Administration (NOAA), Institute for Advanced Sustainability Studies [Potsdam] (IASS), National Institute for Environmental Studies (NIES), NASA Goddard Space Flight Center (GSFC), Aryabhatta Research Institute of Observational Sciences (ARIES), Centro Nacional de Medio Ambiente (CENMA), German Federal Environmental Agency / Umweltbundesamt (UBA), Norwegian Institute for Air Research (NILU), National Institute of Environmental Research [South Korea] (NIER), European Environmental Agency (EEA), Japan Meteorological Agency (JMA), Office of Air and Radiation (OAR), US Environmental Protection Agency (EPA), Environment and Climate Change Canada, Centro de Ciencias de la Atmosfera [Mexico], Universidad Nacional Autónoma de México = National Autonomous University of Mexico (UNAM), National Central University [Taiwan] (NCU), Department of Earth and Environmental Sciences [Korea], Korea University [Seoul], School of Geography, Archaeology and Environmental Studies [Johannesburg] (GAES), University of the Witwatersrand [Johannesburg] (WITS), Department of Civil and Environmental Engineering [Hong Kong] (CEE), The Hong Kong Polytechnic University [Hong Kong] (POLYU), Centre for Ecology and Hydrology [Bangor] (CEH), Natural Environment Research Council (NERC), Instituto Nacional de Técnica Aeroespacial (INTA), 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), Ricerca sul Sistema Energetico (RSE), Instituto de Fisica da Universidade de São Paulo (IFUSP), Universidade de São Paulo = University of São Paulo (USP), Servicio Meteorológico Nacional [Buenos Aires], Institute of Meteorology and Water Management - National Research Institute (IMGW - PIB), CNR Institute of Atmospheric Sciences and Climate (ISAC), National Research Council of Italy | Consiglio Nazionale delle Ricerche (CNR), 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), Izaña Atmospheric Research Center (IARC), Agencia Estatal de Meteorología (AEMet), Iinstitute of Environmental Protection - National Research Institute (IOS-PIB), School of Atmospheric Sciences [Nanjing], Nanjing University (NJU), Umweltbundesamt GmbH = Environment Agency Austria, Latvian Environment Geology and Meteorology Centre (LEGMC), National Atmospheric Research Laboratory [Tirupati] (NARL), Indian Space Research Organisation (ISRO), Centre national de recherches météorologiques (CNRM), Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire Midi-Pyrénées (OMP), Institut de Recherche pour le Développement (IRD)-Université Toulouse III - Paul Sabatier (UT3), Université de Toulouse (UT)-Université de Toulouse (UT)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National d'Études Spatiales [Toulouse] (CNES)-Centre National de la Recherche Scientifique (CNRS)-Météo-France -Institut de Recherche pour le Développement (IRD)-Université Toulouse III - Paul Sabatier (UT3), Université de Toulouse (UT)-Université de Toulouse (UT)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National d'Études Spatiales [Toulouse] (CNES)-Centre National de la Recherche Scientifique (CNRS)-Météo-France -Centre National de la Recherche Scientifique (CNRS), Zentrum für Medizin-Meteorologische Forschung (ZMMF), Deutscher Wetterdienst [Offenbach] (DWD), Laboratoire des Sciences du Climat et de l'Environnement [Gif-sur-Yvette] (LSCE), Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut national des sciences de l'Univers (INSU - CNRS)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS), Chimie Atmosphérique Expérimentale (CAE), Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut national des sciences de l'Univers (INSU - CNRS)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS)-Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut national des sciences de l'Univers (INSU - CNRS)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS), UMD School of Public Health, University of Maryland [College Park], University of Maryland System-University of Maryland System, Institute of Arctic Alpine Research [University of Colorado Boulder] (INSTAAR), University of Colorado [Boulder], Portuguese Institute for Sea and Atmosphere (IMPA), Norsk Institutt for Luftforskning (NILU), Meteorologisches Observatorium Hohenpeißenberg (MOHp), Department of Environmental Science [Roskilde] (ENVS), Aarhus University [Aarhus], School of Science, Technology, Engineering and Mathematics [Bothell] (STEM), University of Washington-Bothell, Indonesian National Institute of Aeronautics and Space (LAPAN), Finnish Meteorological Institute (FMI), National Institute of Meteorological Sciences (NIMS), Air Quality and Climate Change Division [Jerusalem], Israël Ministry of Environmental Protection, Michigan Technological University (MTU), Malaysian Meteorological Department (MetMalaysia), Ministry of Science, Technology and Innovation [Malaysia] (MOSTI), Slovenian Environment Agency, Administratia Nationala de Meteorologie, Department of Chemistry [York, UK], University of York [York, UK], Auckland Council, Jawaharlal Nehru University (JNU), Atmospheric Sciences Research Center (ASRC), University at Albany [SUNY], State University of New York (SUNY)-State University of New York (SUNY), New South Wales Office of Environment and Heritage, A.M.Obukhov Institute of Atmospheric Physics (IAP), Russian Academy of Sciences [Moscow] (RAS), School of Chemistry [Bristol], University of Bristol [Bristol], Indian Institute of Science Education and Research Mohali (IISER Mohali), National University of Ireland [Galway] (NUI Galway), National Institute for Public Health and the Environment [Bilthoven] (RIVM), Brookhaven National Laboratory [Upton, NY] (BNL), UT-Battelle, LLC-Stony Brook University [SUNY] (SBU), State University of New York (SUNY)-State University of New York (SUNY)-U.S. Department of Energy [Washington] (DOE), South Australia Environment Protection Authority (EPA), Swiss Federal Laboratories for Materials Science and Technology [Thun] (EMPA), Indonesian Meteorological, Climatologicall and Geophysical Agency (BMKG), Environment Protection Authority Victoria (EPA ), Institut für Meteorologie und Klimaforschung - Atmosphärische Umweltforschung (IMK-IFU), Karlsruher Institut für Technologie (KIT), China Meteorological Administration (CMA), Alfred-Wegener-Institut, Helmholtz-Zentrum für Polar- und Meeresforschung (AWI), Shandong University, Universidad Nacional Autónoma de México (UNAM), Instituto de Fisica [Sao Paulo], Universidade de São Paulo (USP), Consiglio Nazionale delle Ricerche (CNR), Université Clermont Auvergne [2017-2020] (UCA [2017-2020])-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS), Umweltbundesamt GmbH/Environment Agency Austria, National Atmospheric Research Laboratory [Tirupathi] (NARL), Météo France-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS), Institut national des sciences de l'Univers (INSU - CNRS)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université de Versailles Saint-Quentin-en-Yvelines (UVSQ), Institut national des sciences de l'Univers (INSU - CNRS)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Institut national des sciences de l'Univers (INSU - CNRS)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université de Versailles Saint-Quentin-en-Yvelines (UVSQ), Institute of Arctic and Alpine Research (INSTAAR), U.S. Department of Energy [Washington] (DOE)-UT-Battelle, LLC-Stony Brook University [SUNY] (SBU), and Institut national des sciences de l'Univers (INSU - CNRS)-Météo France-Centre National de la Recherche Scientifique (CNRS)

Subjects
lcsh:GE1-350, tropospheric ozone, [PHYS.PHYS.PHYS-AO-PH]Physics [physics]/Physics [physics]/Atmospheric and Oceanic Physics [physics.ao-ph], Monitoring, ground-level ozone, monitoring, database, Tropospheric ozone, Ecology and Environment, Atmospheric Sciences, Database, Earth sciences, ddc:550, Data and Information, Ground-level ozone, lcsh:Environmental sciences
Abstract

In support of the first Tropospheric Ozone Assessment Report (TOAR) a relational database of global surface ozone observations has been developed and populated with hourly measurement data and enhanced metadata. A comprehensive suite of ozone data products including standard statistics, health and vegetation impact metrics, and trend information, are made available through a common data portal and a web interface. These data form the basis of the TOAR analyses focusing on human health, vegetation, and climate relevant ozone issues, which are part of this special feature. Cooperation among many data centers and individual researchers worldwide made it possible to build the world’s largest collection of in-situ hourly surface ozone data covering the period from 1970 to 2015. By combining the data from almost 10,000 measurement sites around the world with global metadata information, new analyses of surface ozone have become possible, such as the first globally consistent characterisations of measurement sites as either urban or rural/remote. Exploitation of these global metadata allows for new insights into the global distribution, and seasonal and long-term changes of tropospheric ozone and they enable TOAR to perform the first, globally consistent analysis of present-day ozone concentrations and recent ozone changes with relevance to health, agriculture, and climate. Considerable effort was made to harmonize and synthesize data formats and metadata information from various networks and individual data submissions. Extensive quality control was applied to identify questionable and erroneous data, including changes in apparent instrument offsets or calibrations. Such data were excluded from TOAR data products. Limitations of a posteriori data quality assurance are discussed. As a result of the work presented here, global coverage of surface ozone data for scientific analysis has been significantly extended. Yet, large gaps remain in the surface observation network both in terms of regions without monitoring, and in terms of regions that have monitoring programs but no public access to the data archive. Therefore future improvements to the database will require not only improved data harmonization, but also expanded data sharing and increased monitoring in data-sparse regions. This work is part of the Tropospheric Ozone Assessment Report (TOAR) which was supported by the International Global Atmospheric Chemistry (IGAC) project, the National Oceanic and Atmospheric Administration (NOAA), Forschungszentrum Jülich, and the World Meteorological Organisation (WMO). Many institutions and agencies sup¬ported the implementation of the measurements, and the processing, quality assurance, and submission of the data contained in the TOAR database.

Published
2017

3. 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

4. Haze in the Klang Valley of Malaysia

Author

John L. Gras, R. Boers, Gregory P. Ayers, C. P. Leong, Melita Keywood, EGU, Publication, CSIRO Atmospheric Research, Commonwealth Scientific and Industrial Research Organisation [Canberra] (CSIRO), Royal Netherlands Meteorological Institute (KNMI), Malaysian Meteorological Department (MetMalaysia), and Ministry of Science, Technology and Innovation [Malaysia] (MOSTI)

Subjects
[SDU.OCEAN]Sciences of the Universe [physics]/Ocean, Atmosphere, Smoke, Atmospheric Science, Haze, [SDU.OCEAN] Sciences of the Universe [physics]/Ocean, Atmosphere, Monsoon, lcsh:QC1-999, Aerosol, Monsoon period, lcsh:Chemistry, lcsh:QD1-999, Diurnal cycle, Climatology, Environmental science, Physical geography, Caltech Library Services, lcsh:Physics
Abstract

Continuous measurements of dry aerosol light scattering (Bsp) were made at two sites in the Klang Valley of Malaysia between December 1998 and December 2000. In addition 24-hour PM2.5 samples were collected on a one-day-in-six cycle and the chemical composition of the aerosol was determined. Periods of excessive haze were defined as 24-hour average Bsp values greater than 150 Mm-1 and these occurred on a number of occasions, between May and September 1999, during May 2000, and between July and September 2000. The evidence for smoke from biomass burning being a significant contributor to aerosol during periods of excessive haze is discussed. For example, during periods of excessive haze, the chemical composition of the aerosol showed enhanced concentrations of elemental carbon, organic carbon and non-seasalt potassium. The diurnal cycle of Bsp and PM10 was disturbed from its usual pattern of maxima overnight and minuma during the day with morning and afternoon traffic peaks, and instead showed a maximum peak during the middle of the day. Periods of excessive haze were coincident with the presence of forest fires on Sumatra during the southwest (SW) monsoon period, the influence of which are demonstrated by transport modelling for one week of the SW monsoon of 2000. The study highlights that whilst transboundary smoke is a major contributor to poor visibility in the Klang Valley, smoke from fires on Peninsular Malaysia is also a contributor. In addition the uniform concentration of non-seasalt sulfate in PM2.5 at both sites over the entire sampling period suggests the presence of a domestic source of secondary aerosol production in the Klang Valley.

Published
2003

5. 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

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