Effects of atmospheric light scattering on spectroscopic observations of greenhouse gases from space: Validation of PPDF‐based CO2 retrievals from GOSAT
Identifieur interne : 005691 ( Main/Exploration ); précédent : 005690; suivant : 005692Effects of atmospheric light scattering on spectroscopic observations of greenhouse gases from space: Validation of PPDF‐based CO2 retrievals from GOSAT
Auteurs : Sergey Oshchepkov [Japon] ; Andrey Bril [Japon] ; Tatsuya Yokota [Japon] ; Isamu Morino [Japon] ; Yukio Yoshida [Japon] ; Tsuneo Matsunaga [Japon] ; Dmitry Belikov [Japon] ; Debra Wunch [États-Unis] ; Paul Wennberg [États-Unis] ; Geoffrey Toon [États-Unis] ; Christopher O'Dell [États-Unis] ; André Butz [Allemagne] ; Sandrine Guerlet [Pays-Bas] ; Austin Cogan [Royaume-Uni] ; Hartmut Boesch [Royaume-Uni] ; Nawo Eguchi [Japon] ; Nicholas Deutscher [Australie, Allemagne] ; David Griffith [Australie] ; Ronald Macatangay [Australie] ; Justus Notholt [Allemagne] ; Ralf Sussmann [Allemagne] ; Markus Rettinger [Allemagne] ; Vanessa Sherlock [Nouvelle-Zélande] ; John Robinson [Nouvelle-Zélande] ; Esko Kyrö [Finlande] ; Pauli Heikkinen [Finlande] ; Dietrich G. Feist [Allemagne] ; Tomoo Nagahama [Japon] ; Nikolay Kadygrov [France] ; Shamil Maksyutov [Japon] ; Osamu Uchino [Japon] ; Hiroshi Watanabe [Japon]Source :
- Journal of Geophysical Research: Atmospheres [ 0148-0227 ] ; 2012-06-27.
Descripteurs français
- Pascal (Inist)
- Air sec, Aérosol, Carbone, Cirrus, Diffusion lumière, Dioxyde carbone, Dioxyde de carbone, Epaisseur optique, Fonction densité probabilité, Gaz effet serre, Hémisphère Nord, Lumière solaire, Mesure basée sol, Modèle, Mont Sunlight, Nuage glace, Observation par satellite, Observation spectroscopique, Rayonnement solaire, Réseau observation, Satellite, Soleil, Traitement donnée, Transport, Validation, Variation saisonnière, Zone tropicale.
- Wicri :
English descriptors
- KwdEn :
- Absorption bands, Acceptable agreement, Aerosol, Algorithm, Ascension, Ascension island, Atmos, Atmospheric, Atmospheric light, Atmospheric tracer transport model, Atmospheric transport modeling, Blue symbols, Bril, Brown symbols, Butz, Caliop, Carbon dioxide, Cirrus, Cirrus fraction, Clearer display, Climate change, Coincidence criteria, Column abundance, Correlation coefficient, Dark surface, Data processing, Data sets, Dry air, Dxco2, Effective transmittance, Environmental studies, Full physics algorithms, Geophys, Global, Global distribution, Global distributions, Global scale, Gosat, Gosat data, Gosat data processing, Gosat observations, Gosat overpass time, Gosat retrievals, Gosat scans, Gosat soundings, Gosat validation study, Green histogram, Green symbols, Greenhouse, Greenhouse gases, Grid, Ground based measurement, Histogram, Ice cloud, Intergovernmental panel, Karlsruhe institute, Kuze, Lamont, Light path, Light path modification, Light path modifications, Light scattering, Longitude, Longitude grid boxes, Meas, Modeling, Modification, Mole fractions, Moshiri site, Nakajima, National institute, Negative bias, Northern Hemisphere, Northern hemisphere, Ny, Observational network, Offline aerosol transport model, Optical path, Optical path modification, Optical path modifications, Optical thickness, Orange symbols, Oshchepkov, Photon, Phys, Ppdf, Ppdf parameters, Prescreening test, Quality assessment, Radiance spectra, Retrieval, Retrieval quality assessment, Same axis scale, Satellite observation, Seasonal trends, Seasonal variability, Sounding, Southern hemisphere, Spatial resolution, Spectroscopic observations, Spectroscopical observation, Sprintars, Standard deviation, Standard deviations, Subvisible cirrus, Sun, Sunlight, Tccon, Tccon data, Tccon measurements, Tccon observations, Tccon site, Tccon sites, Tccon station, Tccon stations, Time series, Total carbon column, Total number, Tracer, Tropical regions, Tsukuba, Validation, Variability, Vertical profiles, Water vapor column abundance, Wollongong, World data centre, Wunch, Xco2, Xco2 data, Xco2 retrievals, Xh2o, Yokota, Yoshida, aerosols, carbon, carbon dioxide, data processing, greenhouse gas, models, probability density function, satellites, seasonal variations, solar radiation, transport, tropical zone.
- Teeft :
- Absorption bands, Acceptable agreement, Aerosol, Algorithm, Ascension, Ascension island, Atmos, Atmospheric, Atmospheric light, Atmospheric tracer transport model, Atmospheric transport modeling, Blue symbols, Bril, Brown symbols, Butz, Caliop, Carbon dioxide, Cirrus, Cirrus fraction, Clearer display, Climate change, Coincidence criteria, Column abundance, Correlation coefficient, Dark surface, Data processing, Data sets, Dxco2, Effective transmittance, Environmental studies, Full physics algorithms, Geophys, Global, Global distribution, Global distributions, Global scale, Gosat, Gosat data, Gosat data processing, Gosat observations, Gosat overpass time, Gosat retrievals, Gosat scans, Gosat soundings, Gosat validation study, Green histogram, Green symbols, Greenhouse, Greenhouse gases, Grid, Histogram, Intergovernmental panel, Karlsruhe institute, Kuze, Lamont, Light path, Light path modification, Light path modifications, Longitude, Longitude grid boxes, Meas, Modeling, Modification, Mole fractions, Moshiri site, Nakajima, National institute, Negative bias, Northern hemisphere, Ny, Offline aerosol transport model, Optical path, Optical path modification, Optical path modifications, Orange symbols, Oshchepkov, Photon, Phys, Ppdf, Ppdf parameters, Prescreening test, Quality assessment, Radiance spectra, Retrieval, Retrieval quality assessment, Same axis scale, Seasonal trends, Seasonal variability, Sounding, Southern hemisphere, Spatial resolution, Spectroscopic observations, Sprintars, Standard deviation, Standard deviations, Subvisible cirrus, Tccon, Tccon data, Tccon measurements, Tccon observations, Tccon site, Tccon sites, Tccon station, Tccon stations, Time series, Total carbon column, Total number, Tracer, Tropical regions, Tsukuba, Validation, Variability, Vertical profiles, Water vapor column abundance, Wollongong, World data centre, Wunch, Xco2, Xco2 data, Xco2 retrievals, Xh2o, Yokota, Yoshida.
Abstract
This report describes a validation study of Greenhouse gases Observing Satellite (GOSAT) data processing using ground‐based measurements of the Total Carbon Column Observing Network (TCCON) as reference data for column‐averaged dry air mole fractions of atmospheric carbon dioxide (XCO2). We applied the photon path length probability density function method to validate XCO2retrievals from GOSAT data obtained during 22 months starting from June 2009. This method permitted direct evaluation of optical path modifications due to atmospheric light scattering that would have a negligible impact on ground‐based TCCON measurements but could significantly affect gas retrievals when observing reflected sunlight from space. Our results reveal effects of optical path lengthening over Northern Hemispheric stations, essentially from May–September of each year, and of optical path shortening for sun‐glint observations in tropical regions. These effects are supported by seasonal trends in aerosol optical depth derived from an offline three‐dimensional aerosol transport model and by cirrus optical depth derived from space‐based measurements of the Cloud‐Aerosol Lidar with Orthogonal Polarization (CALIOP) instrument. Removal of observations that were highly contaminated by aerosol and cloud from the GOSAT data set resulted in acceptable agreement in the seasonal variability of XCO2 over each station as compared with TCCON measurements. Statistical comparisons between GOSAT and TCCON coincident measurements of CO2column abundance show a correlation coefficient of 0.85, standard deviation of 1.80 ppm, and a sub‐ppm negative bias of −0.43 ppm for all TCCON stations. Global distributions of monthly mean retrieved XCO2 with a spatial resolution of 2.5° latitude × 2.5° longitude show agreement within ∼2.5 ppm with those predicted by the atmospheric tracer transport model.
Url:
DOI: 10.1029/2012JD017505
Affiliations:
- Allemagne, Australie, Finlande, France, Japon, Nouvelle-Zélande, Pays-Bas, Royaume-Uni, États-Unis
- Bade-Wurtemberg, Brême (Land), Californie, Colorado, District de Karlsruhe, Kyūshū, Préfecture de Fukuoka, Utrecht (province), Île-de-France
- Brême, Fukuoka, Gif-sur-Yvette, Karlsruhe, Utrecht
- Université de Kyūshū
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Le document en format XML
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Studies, Tsukuba</wicri:regionArea><wicri:noRegion>Tsukuba</wicri:noRegion></affiliation></author><author><name sortKey="Yoshida, Yukio" sort="Yoshida, Yukio" uniqKey="Yoshida Y" first="Yukio" last="Yoshida">Yukio Yoshida</name><affiliation wicri:level="1"><country xml:lang="fr">Japon</country><wicri:regionArea>National Institute for Environmental Studies, Tsukuba</wicri:regionArea><wicri:noRegion>Tsukuba</wicri:noRegion></affiliation></author><author><name sortKey="Matsunaga, Tsuneo" sort="Matsunaga, Tsuneo" uniqKey="Matsunaga T" first="Tsuneo" last="Matsunaga">Tsuneo Matsunaga</name><affiliation wicri:level="1"><country xml:lang="fr">Japon</country><wicri:regionArea>National Institute for Environmental Studies, Tsukuba</wicri:regionArea><wicri:noRegion>Tsukuba</wicri:noRegion></affiliation></author><author><name sortKey="Belikov, Dmitry" sort="Belikov, Dmitry" uniqKey="Belikov D" first="Dmitry" last="Belikov">Dmitry Belikov</name><affiliation wicri:level="1"><country xml:lang="fr">Japon</country><wicri:regionArea>National Institute for Environmental Studies, Tsukuba</wicri:regionArea><wicri:noRegion>Tsukuba</wicri:noRegion></affiliation></author><author><name sortKey="Wunch, Debra" sort="Wunch, Debra" uniqKey="Wunch D" first="Debra" last="Wunch">Debra Wunch</name><affiliation wicri:level="2"><country xml:lang="fr">États-Unis</country><wicri:regionArea>Division of Geological and Planetary Sciences, California Institute of Technology, Pasadena, California</wicri:regionArea><placeName><region type="state">Californie</region></placeName></affiliation></author><author><name sortKey="Wennberg, Paul" sort="Wennberg, Paul" uniqKey="Wennberg P" first="Paul" last="Wennberg">Paul Wennberg</name><affiliation wicri:level="2"><country xml:lang="fr">États-Unis</country><wicri:regionArea>Division of Geological and Planetary Sciences, California Institute of Technology, Pasadena, California</wicri:regionArea><placeName><region type="state">Californie</region></placeName></affiliation></author><author><name sortKey="Toon, Geoffrey" sort="Toon, Geoffrey" uniqKey="Toon G" first="Geoffrey" last="Toon">Geoffrey Toon</name><affiliation wicri:level="2"><country xml:lang="fr">États-Unis</country><wicri:regionArea>Jet Propulsion Laboratory, California Institute of Technology, Pasadena, California</wicri:regionArea><placeName><region type="state">Californie</region></placeName></affiliation></author><author><name sortKey="O Dell, Christopher" sort="O Dell, Christopher" uniqKey="O Dell C" first="Christopher" last="O'Dell">Christopher O'Dell</name><affiliation wicri:level="2"><country xml:lang="fr">États-Unis</country><wicri:regionArea>Department of Atmospheric Science, Colorado State University, Fort Collins, Colorado</wicri:regionArea><placeName><region type="state">Colorado</region></placeName></affiliation></author><author><name sortKey="Butz, Andre" sort="Butz, Andre" uniqKey="Butz A" first="André" last="Butz">André Butz</name><affiliation wicri:level="3"><country xml:lang="fr">Allemagne</country><wicri:regionArea>IMK-ASF, Karlsruhe Institute of Technology, Karlsruhe</wicri:regionArea><placeName><region type="land" nuts="1">Bade-Wurtemberg</region><region type="district" nuts="2">District de Karlsruhe</region><settlement type="city">Karlsruhe</settlement></placeName></affiliation></author><author><name sortKey="Guerlet, Sandrine" sort="Guerlet, Sandrine" uniqKey="Guerlet S" first="Sandrine" last="Guerlet">Sandrine Guerlet</name><affiliation wicri:level="3"><country xml:lang="fr">Pays-Bas</country><wicri:regionArea>Netherlands Institute for Space Research, Utrecht</wicri:regionArea><placeName><settlement type="city">Utrecht</settlement><region nuts="2" type="province">Utrecht (province)</region></placeName></affiliation></author><author><name sortKey="Cogan, Austin" sort="Cogan, Austin" uniqKey="Cogan A" first="Austin" last="Cogan">Austin Cogan</name><affiliation wicri:level="1"><country xml:lang="fr">Royaume-Uni</country><wicri:regionArea>Earth Observation Science, Space Research Centre, University of Leicester, Leicester</wicri:regionArea><wicri:noRegion>Leicester</wicri:noRegion></affiliation></author><author><name sortKey="Boesch, Hartmut" sort="Boesch, Hartmut" uniqKey="Boesch H" first="Hartmut" last="Boesch">Hartmut Boesch</name><affiliation wicri:level="1"><country xml:lang="fr">Royaume-Uni</country><wicri:regionArea>Earth Observation Science, Space Research Centre, University of Leicester, Leicester</wicri:regionArea><wicri:noRegion>Leicester</wicri:noRegion></affiliation></author><author><name sortKey="Eguchi, Nawo" sort="Eguchi, Nawo" uniqKey="Eguchi N" first="Nawo" last="Eguchi">Nawo Eguchi</name><affiliation wicri:level="4"><country xml:lang="fr">Japon</country><wicri:regionArea>Research Institute for Applied Mechanics, Kyushu University, Kyushu</wicri:regionArea><orgName type="university">Université de Kyūshū</orgName><placeName><settlement type="city">Fukuoka</settlement><region type="province">Kyūshū</region><region type="prefecture">Préfecture de Fukuoka</region></placeName></affiliation></author><author><name sortKey="Deutscher, Nicholas" sort="Deutscher, Nicholas" uniqKey="Deutscher N" first="Nicholas" last="Deutscher">Nicholas Deutscher</name><affiliation wicri:level="1"><country xml:lang="fr">Australie</country><wicri:regionArea>School of Chemistry and Centre for Atmospheric Chemistry, University of Wollongong, Wollongong, New South Wales</wicri:regionArea><wicri:noRegion>New South Wales</wicri:noRegion></affiliation><affiliation wicri:level="3"><country xml:lang="fr">Allemagne</country><wicri:regionArea>Institute of Environmental Physics, University of Bremen, Bremen</wicri:regionArea><placeName><region type="land" nuts="3">Brême (Land)</region><settlement type="city">Brême</settlement></placeName></affiliation></author><author><name sortKey="Griffith, David" sort="Griffith, David" uniqKey="Griffith D" first="David" last="Griffith">David Griffith</name><affiliation wicri:level="1"><country xml:lang="fr">Australie</country><wicri:regionArea>School of Chemistry and Centre for Atmospheric Chemistry, University of Wollongong, Wollongong, New South Wales</wicri:regionArea><wicri:noRegion>New South Wales</wicri:noRegion></affiliation></author><author><name sortKey="Macatangay, Ronald" sort="Macatangay, Ronald" uniqKey="Macatangay R" first="Ronald" last="Macatangay">Ronald Macatangay</name><affiliation wicri:level="1"><country xml:lang="fr">Australie</country><wicri:regionArea>School of Chemistry and Centre for Atmospheric Chemistry, University of Wollongong, Wollongong, New South Wales</wicri:regionArea><wicri:noRegion>New South Wales</wicri:noRegion></affiliation></author><author><name sortKey="Notholt, Justus" sort="Notholt, Justus" uniqKey="Notholt J" first="Justus" last="Notholt">Justus Notholt</name><affiliation wicri:level="3"><country xml:lang="fr">Allemagne</country><wicri:regionArea>Institute of Environmental Physics, University of Bremen, Bremen</wicri:regionArea><placeName><region type="land" nuts="3">Brême (Land)</region><settlement type="city">Brême</settlement></placeName></affiliation></author><author><name sortKey="Sussmann, Ralf" sort="Sussmann, Ralf" uniqKey="Sussmann R" first="Ralf" last="Sussmann">Ralf Sussmann</name><affiliation wicri:level="1"><country xml:lang="fr">Allemagne</country><wicri:regionArea>IMK-IFU, Karlsruhe Institute of Technology, Garmisch-Partenkirchen</wicri:regionArea><wicri:noRegion>Garmisch-Partenkirchen</wicri:noRegion><wicri:noRegion>Garmisch-Partenkirchen</wicri:noRegion></affiliation></author><author><name sortKey="Rettinger, Markus" sort="Rettinger, Markus" uniqKey="Rettinger M" first="Markus" last="Rettinger">Markus Rettinger</name><affiliation wicri:level="1"><country xml:lang="fr">Allemagne</country><wicri:regionArea>IMK-IFU, Karlsruhe Institute of Technology, Garmisch-Partenkirchen</wicri:regionArea><wicri:noRegion>Garmisch-Partenkirchen</wicri:noRegion><wicri:noRegion>Garmisch-Partenkirchen</wicri:noRegion></affiliation></author><author><name sortKey="Sherlock, Vanessa" sort="Sherlock, Vanessa" uniqKey="Sherlock V" first="Vanessa" last="Sherlock">Vanessa Sherlock</name><affiliation wicri:level="1"><country xml:lang="fr">Nouvelle-Zélande</country><wicri:regionArea>National Institute of Water and Atmospheric Research, Wellington</wicri:regionArea><wicri:noRegion>Wellington</wicri:noRegion></affiliation></author><author><name sortKey="Robinson, John" sort="Robinson, John" uniqKey="Robinson J" first="John" last="Robinson">John Robinson</name><affiliation wicri:level="1"><country xml:lang="fr">Nouvelle-Zélande</country><wicri:regionArea>National Institute of Water and Atmospheric Research, Wellington</wicri:regionArea><wicri:noRegion>Wellington</wicri:noRegion></affiliation></author><author><name sortKey="Kyro, Esko" sort="Kyro, Esko" uniqKey="Kyro E" first="Esko" last="Kyrö">Esko Kyrö</name><affiliation wicri:level="1"><country xml:lang="fr">Finlande</country><wicri:regionArea>FMI-Arctic Research Center, Sodankylä</wicri:regionArea><wicri:noRegion>Sodankylä</wicri:noRegion></affiliation></author><author><name sortKey="Heikkinen, Pauli" sort="Heikkinen, Pauli" uniqKey="Heikkinen P" first="Pauli" last="Heikkinen">Pauli Heikkinen</name><affiliation wicri:level="1"><country xml:lang="fr">Finlande</country><wicri:regionArea>FMI-Arctic Research Center, Sodankylä</wicri:regionArea><wicri:noRegion>Sodankylä</wicri:noRegion></affiliation></author><author><name sortKey="Feist, Dietrich G" sort="Feist, Dietrich G" uniqKey="Feist D" first="Dietrich G." last="Feist">Dietrich G. Feist</name><affiliation wicri:level="1"><country xml:lang="fr">Allemagne</country><wicri:regionArea>Max Planck Institute for Biogeochemistry, Jena</wicri:regionArea><wicri:noRegion>Jena</wicri:noRegion><wicri:noRegion>Jena</wicri:noRegion></affiliation></author><author><name sortKey="Nagahama, Tomoo" sort="Nagahama, Tomoo" uniqKey="Nagahama T" first="Tomoo" last="Nagahama">Tomoo Nagahama</name><affiliation wicri:level="1"><country xml:lang="fr">Japon</country><wicri:regionArea>Solar-Terrestrial Environment Laboratory, Nagoya University, Nagoya</wicri:regionArea><wicri:noRegion>Nagoya</wicri:noRegion></affiliation></author><author><name sortKey="Kadygrov, Nikolay" sort="Kadygrov, Nikolay" uniqKey="Kadygrov N" first="Nikolay" last="Kadygrov">Nikolay Kadygrov</name><affiliation wicri:level="3"><country xml:lang="fr">France</country><wicri:regionArea>Laboratoire des Sciences du Climat et de l'Environnement, CEA, СNRS, UVSQ, IPSL, Gif-sur-Yvette</wicri:regionArea><placeName><region type="region" nuts="2">Île-de-France</region><settlement type="city">Gif-sur-Yvette</settlement></placeName></affiliation></author><author><name sortKey="Maksyutov, Shamil" sort="Maksyutov, Shamil" uniqKey="Maksyutov S" first="Shamil" last="Maksyutov">Shamil Maksyutov</name><affiliation wicri:level="1"><country xml:lang="fr">Japon</country><wicri:regionArea>National Institute for Environmental Studies, Tsukuba</wicri:regionArea><wicri:noRegion>Tsukuba</wicri:noRegion></affiliation></author><author><name sortKey="Uchino, Osamu" sort="Uchino, Osamu" uniqKey="Uchino O" first="Osamu" last="Uchino">Osamu Uchino</name><affiliation wicri:level="1"><country xml:lang="fr">Japon</country><wicri:regionArea>National Institute for Environmental Studies, Tsukuba</wicri:regionArea><wicri:noRegion>Tsukuba</wicri:noRegion></affiliation></author><author><name sortKey="Watanabe, Hiroshi" sort="Watanabe, Hiroshi" uniqKey="Watanabe H" first="Hiroshi" last="Watanabe">Hiroshi Watanabe</name><affiliation wicri:level="1"><country xml:lang="fr">Japon</country><wicri:regionArea>National Institute for Environmental Studies, Tsukuba</wicri:regionArea><wicri:noRegion>Tsukuba</wicri:noRegion></affiliation></author></analytic><monogr></monogr><series><title level="j" type="main">Journal of Geophysical Research: Atmospheres</title><title level="j" type="alt">JOURNAL OF GEOPHYSICAL RESEARCH: ATMOSPHERES</title><idno type="ISSN">0148-0227</idno><idno type="eISSN">2156-2202</idno><imprint><biblScope unit="vol">117</biblScope><biblScope unit="issue">D12</biblScope><biblScope unit="page-count">18</biblScope><date type="published" when="2012-06-27">2012-06-27</date></imprint><idno type="ISSN">0148-0227</idno></series></biblStruct></sourceDesc><seriesStmt><idno type="ISSN">0148-0227</idno></seriesStmt></fileDesc><profileDesc><textClass><keywords scheme="KwdEn" xml:lang="en"><term>Absorption bands</term><term>Acceptable agreement</term><term>Aerosol</term><term>Algorithm</term><term>Ascension</term><term>Ascension island</term><term>Atmos</term><term>Atmospheric</term><term>Atmospheric light</term><term>Atmospheric tracer transport model</term><term>Atmospheric transport modeling</term><term>Blue symbols</term><term>Bril</term><term>Brown symbols</term><term>Butz</term><term>Caliop</term><term>Carbon dioxide</term><term>Cirrus</term><term>Cirrus fraction</term><term>Clearer display</term><term>Climate change</term><term>Coincidence criteria</term><term>Column abundance</term><term>Correlation coefficient</term><term>Dark surface</term><term>Data processing</term><term>Data sets</term><term>Dry air</term><term>Dxco2</term><term>Effective transmittance</term><term>Environmental studies</term><term>Full physics algorithms</term><term>Geophys</term><term>Global</term><term>Global distribution</term><term>Global distributions</term><term>Global scale</term><term>Gosat</term><term>Gosat data</term><term>Gosat data processing</term><term>Gosat observations</term><term>Gosat overpass time</term><term>Gosat retrievals</term><term>Gosat scans</term><term>Gosat soundings</term><term>Gosat validation study</term><term>Green histogram</term><term>Green symbols</term><term>Greenhouse</term><term>Greenhouse gases</term><term>Grid</term><term>Ground based measurement</term><term>Histogram</term><term>Ice cloud</term><term>Intergovernmental panel</term><term>Karlsruhe institute</term><term>Kuze</term><term>Lamont</term><term>Light path</term><term>Light path modification</term><term>Light path modifications</term><term>Light scattering</term><term>Longitude</term><term>Longitude grid boxes</term><term>Meas</term><term>Modeling</term><term>Modification</term><term>Mole fractions</term><term>Moshiri site</term><term>Nakajima</term><term>National institute</term><term>Negative bias</term><term>Northern Hemisphere</term><term>Northern hemisphere</term><term>Ny</term><term>Observational network</term><term>Offline aerosol transport model</term><term>Optical path</term><term>Optical path modification</term><term>Optical path modifications</term><term>Optical thickness</term><term>Orange symbols</term><term>Oshchepkov</term><term>Photon</term><term>Phys</term><term>Ppdf</term><term>Ppdf parameters</term><term>Prescreening test</term><term>Quality assessment</term><term>Radiance spectra</term><term>Retrieval</term><term>Retrieval quality assessment</term><term>Same axis scale</term><term>Satellite observation</term><term>Seasonal trends</term><term>Seasonal variability</term><term>Sounding</term><term>Southern hemisphere</term><term>Spatial resolution</term><term>Spectroscopic observations</term><term>Spectroscopical observation</term><term>Sprintars</term><term>Standard deviation</term><term>Standard deviations</term><term>Subvisible cirrus</term><term>Sun</term><term>Sunlight</term><term>Tccon</term><term>Tccon data</term><term>Tccon measurements</term><term>Tccon observations</term><term>Tccon site</term><term>Tccon sites</term><term>Tccon station</term><term>Tccon stations</term><term>Time series</term><term>Total carbon column</term><term>Total number</term><term>Tracer</term><term>Tropical regions</term><term>Tsukuba</term><term>Validation</term><term>Variability</term><term>Vertical profiles</term><term>Water vapor column abundance</term><term>Wollongong</term><term>World data centre</term><term>Wunch</term><term>Xco2</term><term>Xco2 data</term><term>Xco2 retrievals</term><term>Xh2o</term><term>Yokota</term><term>Yoshida</term><term>aerosols</term><term>carbon</term><term>carbon dioxide</term><term>data processing</term><term>greenhouse gas</term><term>models</term><term>probability density function</term><term>satellites</term><term>seasonal variations</term><term>solar radiation</term><term>transport</term><term>tropical zone</term></keywords><keywords scheme="Pascal" xml:lang="fr"><term>Air sec</term><term>Aérosol</term><term>Carbone</term><term>Cirrus</term><term>Diffusion lumière</term><term>Dioxyde carbone</term><term>Dioxyde de carbone</term><term>Epaisseur optique</term><term>Fonction densité probabilité</term><term>Gaz effet serre</term><term>Hémisphère Nord</term><term>Lumière solaire</term><term>Mesure basée sol</term><term>Modèle</term><term>Mont Sunlight</term><term>Nuage glace</term><term>Observation par satellite</term><term>Observation spectroscopique</term><term>Rayonnement solaire</term><term>Réseau observation</term><term>Satellite</term><term>Soleil</term><term>Traitement donnée</term><term>Transport</term><term>Validation</term><term>Variation saisonnière</term><term>Zone tropicale</term></keywords><keywords scheme="Teeft" xml:lang="en"><term>Absorption bands</term><term>Acceptable agreement</term><term>Aerosol</term><term>Algorithm</term><term>Ascension</term><term>Ascension island</term><term>Atmos</term><term>Atmospheric</term><term>Atmospheric light</term><term>Atmospheric tracer transport model</term><term>Atmospheric transport modeling</term><term>Blue symbols</term><term>Bril</term><term>Brown symbols</term><term>Butz</term><term>Caliop</term><term>Carbon dioxide</term><term>Cirrus</term><term>Cirrus fraction</term><term>Clearer display</term><term>Climate change</term><term>Coincidence criteria</term><term>Column abundance</term><term>Correlation coefficient</term><term>Dark surface</term><term>Data processing</term><term>Data sets</term><term>Dxco2</term><term>Effective transmittance</term><term>Environmental studies</term><term>Full physics algorithms</term><term>Geophys</term><term>Global</term><term>Global distribution</term><term>Global distributions</term><term>Global scale</term><term>Gosat</term><term>Gosat data</term><term>Gosat data processing</term><term>Gosat observations</term><term>Gosat overpass time</term><term>Gosat retrievals</term><term>Gosat scans</term><term>Gosat soundings</term><term>Gosat validation study</term><term>Green histogram</term><term>Green symbols</term><term>Greenhouse</term><term>Greenhouse gases</term><term>Grid</term><term>Histogram</term><term>Intergovernmental panel</term><term>Karlsruhe institute</term><term>Kuze</term><term>Lamont</term><term>Light path</term><term>Light path modification</term><term>Light path modifications</term><term>Longitude</term><term>Longitude grid boxes</term><term>Meas</term><term>Modeling</term><term>Modification</term><term>Mole fractions</term><term>Moshiri site</term><term>Nakajima</term><term>National institute</term><term>Negative bias</term><term>Northern hemisphere</term><term>Ny</term><term>Offline aerosol transport model</term><term>Optical path</term><term>Optical path modification</term><term>Optical path modifications</term><term>Orange symbols</term><term>Oshchepkov</term><term>Photon</term><term>Phys</term><term>Ppdf</term><term>Ppdf parameters</term><term>Prescreening test</term><term>Quality assessment</term><term>Radiance spectra</term><term>Retrieval</term><term>Retrieval quality assessment</term><term>Same axis scale</term><term>Seasonal trends</term><term>Seasonal variability</term><term>Sounding</term><term>Southern hemisphere</term><term>Spatial resolution</term><term>Spectroscopic observations</term><term>Sprintars</term><term>Standard deviation</term><term>Standard deviations</term><term>Subvisible cirrus</term><term>Tccon</term><term>Tccon data</term><term>Tccon measurements</term><term>Tccon observations</term><term>Tccon site</term><term>Tccon sites</term><term>Tccon station</term><term>Tccon stations</term><term>Time series</term><term>Total carbon column</term><term>Total number</term><term>Tracer</term><term>Tropical regions</term><term>Tsukuba</term><term>Validation</term><term>Variability</term><term>Vertical profiles</term><term>Water vapor column abundance</term><term>Wollongong</term><term>World data centre</term><term>Wunch</term><term>Xco2</term><term>Xco2 data</term><term>Xco2 retrievals</term><term>Xh2o</term><term>Yokota</term><term>Yoshida</term></keywords><keywords scheme="Wicri" type="topic" xml:lang="fr"><term>Aérosol</term><term>Carbone</term><term>Changement climatique</term><term>Satellite</term><term>Traitement des données</term><term>Zone tropicale</term></keywords></textClass></profileDesc></teiHeader><front><div type="abstract">This report describes a validation study of Greenhouse gases Observing Satellite (GOSAT) data processing using ground‐based measurements of the Total Carbon Column Observing Network (TCCON) as reference data for column‐averaged dry air mole fractions of atmospheric carbon dioxide (XCO2). We applied the photon path length probability density function method to validate XCO2retrievals from GOSAT data obtained during 22 months starting from June 2009. This method permitted direct evaluation of optical path modifications due to atmospheric light scattering that would have a negligible impact on ground‐based TCCON measurements but could significantly affect gas retrievals when observing reflected sunlight from space. Our results reveal effects of optical path lengthening over Northern Hemispheric stations, essentially from May–September of each year, and of optical path shortening for sun‐glint observations in tropical regions. These effects are supported by seasonal trends in aerosol optical depth derived from an offline three‐dimensional aerosol transport model and by cirrus optical depth derived from space‐based measurements of the Cloud‐Aerosol Lidar with Orthogonal Polarization (CALIOP) instrument. Removal of observations that were highly contaminated by aerosol and cloud from the GOSAT data set resulted in acceptable agreement in the seasonal variability of XCO2 over each station as compared with TCCON measurements. Statistical comparisons between GOSAT and TCCON coincident measurements of CO2column abundance show a correlation coefficient of 0.85, standard deviation of 1.80 ppm, and a sub‐ppm negative bias of −0.43 ppm for all TCCON stations. Global distributions of monthly mean retrieved XCO2 with a spatial resolution of 2.5° latitude × 2.5° longitude show agreement within ∼2.5 ppm with those predicted by the atmospheric tracer transport model.</div></front></TEI><affiliations><list><country><li>Allemagne</li><li>Australie</li><li>Finlande</li><li>France</li><li>Japon</li><li>Nouvelle-Zélande</li><li>Pays-Bas</li><li>Royaume-Uni</li><li>États-Unis</li></country><region><li>Bade-Wurtemberg</li><li>Brême (Land)</li><li>Californie</li><li>Colorado</li><li>District de Karlsruhe</li><li>Kyūshū</li><li>Préfecture de Fukuoka</li><li>Utrecht (province)</li><li>Île-de-France</li></region><settlement><li>Brême</li><li>Fukuoka</li><li>Gif-sur-Yvette</li><li>Karlsruhe</li><li>Utrecht</li></settlement><orgName><li>Université de Kyūshū</li></orgName></list><tree><country name="Japon"><noRegion><name sortKey="Oshchepkov, Sergey" sort="Oshchepkov, Sergey" uniqKey="Oshchepkov S" first="Sergey" last="Oshchepkov">Sergey Oshchepkov</name></noRegion><name sortKey="Belikov, Dmitry" sort="Belikov, Dmitry" uniqKey="Belikov D" first="Dmitry" last="Belikov">Dmitry Belikov</name><name sortKey="Bril, Andrey" sort="Bril, Andrey" uniqKey="Bril A" first="Andrey" last="Bril">Andrey Bril</name><name sortKey="Eguchi, Nawo" sort="Eguchi, Nawo" uniqKey="Eguchi N" first="Nawo" last="Eguchi">Nawo Eguchi</name><name sortKey="Maksyutov, Shamil" sort="Maksyutov, Shamil" uniqKey="Maksyutov S" first="Shamil" last="Maksyutov">Shamil Maksyutov</name><name sortKey="Matsunaga, Tsuneo" sort="Matsunaga, Tsuneo" uniqKey="Matsunaga T" first="Tsuneo" last="Matsunaga">Tsuneo Matsunaga</name><name sortKey="Morino, Isamu" sort="Morino, Isamu" uniqKey="Morino I" first="Isamu" last="Morino">Isamu Morino</name><name sortKey="Nagahama, Tomoo" sort="Nagahama, Tomoo" uniqKey="Nagahama T" first="Tomoo" last="Nagahama">Tomoo Nagahama</name><name sortKey="Oshchepkov, Sergey" sort="Oshchepkov, Sergey" uniqKey="Oshchepkov S" first="Sergey" last="Oshchepkov">Sergey Oshchepkov</name><name sortKey="Oshchepkov, Sergey" sort="Oshchepkov, Sergey" uniqKey="Oshchepkov S" first="Sergey" last="Oshchepkov">Sergey Oshchepkov</name><name sortKey="Uchino, Osamu" sort="Uchino, Osamu" uniqKey="Uchino O" first="Osamu" last="Uchino">Osamu Uchino</name><name sortKey="Watanabe, Hiroshi" sort="Watanabe, Hiroshi" uniqKey="Watanabe H" first="Hiroshi" last="Watanabe">Hiroshi Watanabe</name><name sortKey="Yokota, Tatsuya" sort="Yokota, Tatsuya" uniqKey="Yokota T" first="Tatsuya" last="Yokota">Tatsuya Yokota</name><name sortKey="Yoshida, Yukio" sort="Yoshida, Yukio" uniqKey="Yoshida Y" first="Yukio" last="Yoshida">Yukio Yoshida</name></country><country name="États-Unis"><region name="Californie"><name sortKey="Wunch, Debra" sort="Wunch, Debra" uniqKey="Wunch D" first="Debra" last="Wunch">Debra Wunch</name></region><name sortKey="O Dell, Christopher" sort="O Dell, Christopher" uniqKey="O Dell C" first="Christopher" last="O'Dell">Christopher O'Dell</name><name sortKey="Toon, Geoffrey" sort="Toon, Geoffrey" uniqKey="Toon G" first="Geoffrey" last="Toon">Geoffrey Toon</name><name sortKey="Wennberg, Paul" sort="Wennberg, Paul" uniqKey="Wennberg P" first="Paul" last="Wennberg">Paul Wennberg</name></country><country name="Allemagne"><region name="Bade-Wurtemberg"><name sortKey="Butz, Andre" sort="Butz, Andre" uniqKey="Butz A" first="André" last="Butz">André Butz</name></region><name sortKey="Deutscher, Nicholas" sort="Deutscher, Nicholas" uniqKey="Deutscher N" first="Nicholas" last="Deutscher">Nicholas Deutscher</name><name sortKey="Feist, Dietrich G" sort="Feist, Dietrich G" uniqKey="Feist D" first="Dietrich G." last="Feist">Dietrich G. Feist</name><name sortKey="Notholt, Justus" sort="Notholt, Justus" uniqKey="Notholt J" first="Justus" last="Notholt">Justus Notholt</name><name sortKey="Rettinger, Markus" sort="Rettinger, Markus" uniqKey="Rettinger M" first="Markus" last="Rettinger">Markus Rettinger</name><name sortKey="Sussmann, Ralf" sort="Sussmann, Ralf" uniqKey="Sussmann R" first="Ralf" last="Sussmann">Ralf Sussmann</name></country><country name="Pays-Bas"><region name="Utrecht (province)"><name sortKey="Guerlet, Sandrine" sort="Guerlet, Sandrine" uniqKey="Guerlet S" first="Sandrine" last="Guerlet">Sandrine Guerlet</name></region></country><country name="Royaume-Uni"><noRegion><name sortKey="Cogan, Austin" sort="Cogan, Austin" uniqKey="Cogan A" first="Austin" last="Cogan">Austin Cogan</name></noRegion><name sortKey="Boesch, Hartmut" sort="Boesch, Hartmut" uniqKey="Boesch H" first="Hartmut" last="Boesch">Hartmut Boesch</name></country><country name="Australie"><noRegion><name sortKey="Deutscher, Nicholas" sort="Deutscher, Nicholas" uniqKey="Deutscher N" first="Nicholas" last="Deutscher">Nicholas Deutscher</name></noRegion><name sortKey="Griffith, David" sort="Griffith, David" uniqKey="Griffith D" first="David" last="Griffith">David Griffith</name><name sortKey="Macatangay, Ronald" sort="Macatangay, Ronald" uniqKey="Macatangay R" first="Ronald" last="Macatangay">Ronald Macatangay</name></country><country name="Nouvelle-Zélande"><noRegion><name sortKey="Sherlock, Vanessa" sort="Sherlock, Vanessa" uniqKey="Sherlock V" first="Vanessa" last="Sherlock">Vanessa Sherlock</name></noRegion><name sortKey="Robinson, John" sort="Robinson, John" uniqKey="Robinson J" first="John" last="Robinson">John Robinson</name></country><country name="Finlande"><noRegion><name sortKey="Kyro, Esko" sort="Kyro, Esko" uniqKey="Kyro E" first="Esko" last="Kyrö">Esko Kyrö</name></noRegion><name sortKey="Heikkinen, Pauli" sort="Heikkinen, Pauli" uniqKey="Heikkinen P" first="Pauli" last="Heikkinen">Pauli Heikkinen</name></country><country name="France"><region name="Île-de-France"><name sortKey="Kadygrov, Nikolay" sort="Kadygrov, Nikolay" uniqKey="Kadygrov N" first="Nikolay" last="Kadygrov">Nikolay Kadygrov</name></region></country></tree></affiliations></record>Pour manipuler ce document sous Unix (Dilib)
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