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|Title:||Atmospheric carbon dioxide retrieved from the Greenhouse gases Observing SATellite (GOSAT): Comparison with ground-based TCCON observations and GEOS-Chem model calculations|
|Authors:||Cogan, A. J.|
Parker, R. J.
Palmer, P. I.
Blavier, J-F. L.
Deutscher, N. M.
|Publisher:||American Geophysical Union (AGU), Wiley|
|Citation:||Journal of Geophysical Research: Atmospheres, 2012, 117, pp. ?-? (17)|
|Abstract:||We retrieved column-averaged dry air mole fractions of atmospheric carbon dioxide (X[SUBSCRIPT CO2]) from backscattered short-wave infrared (SWIR) sunlight measured by the Japanese Greenhouse gases Observing SATellite (GOSAT). Over two years of X [SUBSCRIPT CO2] retrieved from GOSAT is compared with X [SUBSCRIPT CO2] inferred from collocated SWIR measurements by seven ground-based Total Carbon Column Observing Network (TCCON) stations. The average difference between GOSAT and TCCON X [SUBSCRIPT CO2] 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 [SUBSCRIPT CO2] retrievals of −0.20 ppm with a standard deviation of 2.26 ppm and a correlation coefficient of 0.75. One year of X [SUBSCRIPT CO2] 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 [SUBSCRIPT CO2] 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.|
|Rights:||Archived with reference to SHERPA/RoMEO and publisher website.|
|Appears in Collections:||Published Articles, Dept. of Physics and Astronomy|
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|Cogan_et_al-2012-Journal_of_Geophysical_Research-_Atmospheres_(1984-2012).pdf||Published (publisher PDF)||2.61 MB||Adobe PDF||View/Open|
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