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Atmospheric carbon dioxide retrieved from the Greenhouse gases Observing SATellite (GOSAT): Comparison with ground-based TCCON observations and GEOS-Chem model calculations

Cogan, A. J. and Boesch, H. and Parker, R. J. and Feng, L. and Palmer, P. I. and Blavier, J.-F. L. and Deutscher, N. M. and Macatangay, R. and Notholt, J. and Roehl, C. and Warneke, T. and Wunch, D. (2012) Atmospheric carbon dioxide retrieved from the Greenhouse gases Observing SATellite (GOSAT): Comparison with ground-based TCCON observations and GEOS-Chem model calculations. Journal of Geophysical Research D, 117 . Art. No. D21301. ISSN 0148-0227. https://resolver.caltech.edu/CaltechAUTHORS:20121207-132732061

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Abstract

We retrieved column-averaged dry air mole fractions of atmospheric carbon dioxide (X_CO_2) from backscattered short-wave infrared (SWIR) sunlight measured by the Japanese Greenhouse gases Observing SATellite (GOSAT). Over two years of X_CO_2 retrieved from GOSAT is compared with X_CO_2 inferred from collocated SWIR measurements by seven ground-based Total Carbon Column Observing Network (TCCON) stations. The average difference between GOSAT and TCCON X_CO_2 for individual TCCON sites ranges from −0.87 ppm to 0.77 ppm with a mean value of 0.1 ppm and standard deviation of 0.56 ppm. We find an average bias between all GOSAT and TCCON X_CO_2 retrievals of −0.20 ppm with a standard deviation of 2.26 ppm and a correlation coefficient of 0.75. One year of XCO2 was retrieved from GOSAT globally, which was compared to global 3-D GEOS-Chem chemistry transport model calculations. We find that the latitudinal gradient, seasonal cycles, and spatial variability of GOSAT and GEOS-Chem agree well in general with a correlation coefficient of 0.61. Regional differences between GEOS-Chem model calculations and GOSAT observations are typically less than 1 ppm except for the Sahara and central Asia where a mean difference between 2 to 3 ppm is observed, indicating regional biases in the GOSAT X_CO_2 retrievals unobserved by the current TCCON network. Using a bias correction scheme based on linear regression these regional biases are significantly reduced, approaching the required accuracy for surface flux inversions.


Item Type:Article
Related URLs:
URLURL TypeDescription
http://dx.doi.org/10.1029/2012JD018087DOIArticle
ORCID:
AuthorORCID
Boesch, H.0000-0003-3944-9879
Parker, R. J.0000-0002-0801-0831
Deutscher, N. M.0000-0002-2906-2577
Roehl, C.0000-0001-5383-8462
Warneke, T.0000-0001-5185-3415
Wunch, D.0000-0002-4924-0377
Additional Information:© 2012 American Geophysical Union. Received 8 May 2012; accepted 21 September 2012; published 1 November 2012. We thank JAXA, NIES, and MOE for the GOSAT data and their continuous support as part of the Joint Research Agreement. A.C. is supported by the NERC, R.P., and L.F. are supported by the NCEO and H.B. is supported by a RCUK fellowship. We also thank the OCO team at JPL for providing the retrieval algorithm. We thank the BADC for providing ECMWF Operational Analyses data. U.S. funding for TCCON comes from NASA’s Terrestrial Ecology Program, grant NNX11AG01G, the Orbiting Carbon Observatory Program, the Atmospheric CO2 Observations from Space (ACOS) Program and the DOE/ ARM Program of Research Science and Technology contracts C01X0204 and CO1X0406. Lauder TCCON data was obtained from the TCCON Data Archive, operated by the California Institute of Technology from the Web site at http://tccon.ipac.caltech.edu/. We acknowledge financial support of the Bialystok and Orleans TCCON sites from the Senate of Bremen and EU projects IMECC and GEOmon as well as maintenance and logistical work provided by AeroMeteo Service (Bialystok) and the RAMCES team at LSCE (Gif-sur-Yvette, France).
Funders:
Funding AgencyGrant Number
Japan Aerospace Exploration Agency (JAXA)UNSPECIFIED
National Institute for Environmental Studies (Japan)UNSPECIFIED
MOEUNSPECIFIED
GOSATUNSPECIFIED
Natural Environment Research Council (NERC)UNSPECIFIED
NCEOUNSPECIFIED
Research Councils UK (RCUK)UNSPECIFIED
Senate of BremenUNSPECIFIED
EU project IMECCUNSPECIFIED
EU project GEOmonUNSPECIFIED
AeroMeteo ServiceUNSPECIFIED
RAMCES teamUNSPECIFIED
NASANNX11AG01G
Orbiting Carbon Observatory ProgramUNSPECIFIED
Atmospheric CO2 Observations from Space (ACOS) ProgramUNSPECIFIED
Department of Energy (DOE)C01X0204
Department of Energy (DOE)CO1X0406
Subject Keywords:GEOS-Chem; GOSAT; carbon dioxide; greenhouse gases; remote sensing Index terms: Atmospheric Composition and Structure: Biosphere/atmosphere interactions (0426, 1610); Atmospheric Composition and Structure: Middle atmosphere: composition and chemistry; Atmospheric Composition and Structure: Troposphere: composition and chemistry; Atmospheric Composition and Structure: Instruments and techniques; Exploration Geophysics: Remote sensing
Record Number:CaltechAUTHORS:20121207-132732061
Persistent URL:https://resolver.caltech.edu/CaltechAUTHORS:20121207-132732061
Official Citation:Cogan, A. J., et al. (2012), Atmospheric carbon dioxide retrieved from the Greenhouse gases Observing SATellite (GOSAT): Comparison with ground-based TCCON observations and GEOS-Chem model calculations, J. Geophys. Res., 117, D21301, doi:10.1029/2012JD018087.
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:35879
Collection:CaltechAUTHORS
Deposited By: Jason Perez
Deposited On:10 Dec 2012 17:31
Last Modified:09 Mar 2020 13:19

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