Does GOSAT capture the true seasonal cycle of carbon dioxide?
In: ISSN: 1680-7316, 2015
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academicJournal
Zugriff:
International audience ; The seasonal cycle accounts for a dominant mode of total column CO 2 (XCO 2) annual variability and is connected to CO 2 uptake and release; it thus represents an important quantity to test the accuracy of the measurements from space. We quantitatively evaluate the XCO 2 seasonal cycle of the Greenhouse Gases Observing Satellite (GOSAT) observations from the Atmospheric CO 2 Observations from Space (ACOS) retrieval system and compare average regional seasonal cycle features to those directly measured by the Total Carbon Column Observing Network (TCCON). We analyse the mean seasonal cycle amplitude, dates of maximum and minimum XCO 2 , as well as the regional growth rates in XCO 2 through the fitted trend over several years. We find that GOSAT/ACOS captures the seasonal cycle amplitude within 1.0 ppm accuracy compared to TCCON, except in Europe, where the difference exceeds 1.0 ppm at two sites, and the amplitude captured by GOSAT/ACOS is generally shallower compared to TCCON. This bias over Europe is not as large for the other GOSAT retrieval algorithms (NIES v02.21, Re-moTeC v2.35, UoL v5.1, and NIES PPDF-S v.02.11), although they have significant biases at other sites. We find that the ACOS bias correction partially explains the shallow amplitude over Europe. The impact of the co-location method and aerosol changes in the ACOS algorithm were also tested and found to be few tenths of a ppm and mostly non-systematic. We find generally good agreement in the date of minimum XCO 2 between ACOS and TCCON, but ACOS generally infers a date of maximum XCO 2 2-3 weeks later than TCCON. We further analyse the latitudinal dependence of the seasonal cycle amplitude throughout the Northern Hemisphere and compare the dependence to that predicted by current optimized models that assimilate in situ measurements of CO 2. In the zonal averages, models are consistent with the GOSAT amplitude to within 1.4 ppm, depending on the model and latitude. We also show that the seasonal cycle of XCO 2 depends on ...
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Does GOSAT capture the true seasonal cycle of carbon dioxide?
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Autor/in / Beteiligte Person: | Lindqvist, H. ; O'Dell, C. ; Basu, S. ; Boesch, H. ; Chevallier, F. ; Deutscher, N. ; Feng, L. ; Fisher, B. ; Hase, F. ; Inoue, M. ; Kivi, R. ; Morino, I. ; Palmer, P. ; Parker, R. ; Schneider, M. ; Sussmann, R. ; Yoshida, Y. ; Finnish Meteorological Institute (FMI) ; Colorado State University Fort Collins (CSU) ; Cooperative Institute for Research in Environmental Sciences (CIRES) ; University of Colorado Boulder -National Oceanic and Atmospheric Administration (NOAA) ; NOAA Earth System Research Laboratory (ESRL) ; National Oceanic and Atmospheric Administration (NOAA) ; University of Leicester ; NERC National Centre for Earth Observation (NCEO) ; Natural Environment Research Council (NERC) ; Laboratoire des Sciences du Climat et de l'Environnement Gif-sur-Yvette (LSCE) ; 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)-Direction de Recherche Fondamentale (CEA) (DRF (CEA)) ; Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA) ; Modélisation INVerse pour les mesures atmosphériques et SATellitaires (SATINV) ; Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-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)-Direction de Recherche Fondamentale (CEA) (DRF (CEA)) ; Institute of Environmental Physics Bremen (IUP) ; University of Bremen ; School of Chemistry Wollongong ; University of Wollongong Australia ; Jet Propulsion Laboratory (JPL) ; NASA-California Institute of Technology (CALTECH) ; Institute for Meteorology and Climate Research (IMK) ; Karlsruhe Institute of Technology (KIT) ; National Institute for Environmental Studies (NIES) ; School of Geosciences Edinburgh ; University of Edinburgh (Edin.) ; Institut für Meteorologie und Klimaforschung - Atmosphärische Umweltforschung (IMK-IFU) ; Karlsruher Institut für Technologie (KIT) |
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Zeitschrift: | ISSN: 1680-7316, 2015 |
Veröffentlichung: | HAL CCSD ; European Geosciences Union, 2015 |
Medientyp: | academicJournal |
DOI: | 10.5194/acp-15-13023-2015 |
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