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

Authors

A Cogan, University of Leicester
H Boesch, University of Leicester
R Parker, University of Leicester
L Feng, University of Edinburgh
Paul Palmer, University of EdinburghFollow
J-F Blavier, California Institute of Technology
Nicholas M. Deutscher, University of WollongongFollow
Ronald Macatangay, University of WollongongFollow
Justus Notholt, University of Bremen
C M. Roehl, California Institute of Technology
Thorsten Warneke, University of Bremen
Debra Wunch, California Institute of Technology

RIS ID

72540

Publication Details

Cogan, A., Boesch, H., Parker, R., Feng, L., Palmer, P., Blavier, J., Deutscher, N. M., Macatangay, R., Notholt, J., Roehl, C. M., Warneke, T. & 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: Atmospheres, 117 (21), D21301.

Abstract

We retrieved column-averaged dry air mole fractions of atmospheric carbon dioxide (XCO 2) from backscattered short-wave infrared (SWIR) sunlight measured by the Japanese Greenhouse gases Observing SATellite (GOSAT). Over two years of XCO 2 retrieved from GOSAT is compared with XCO 2 inferred from collocated SWIR measurements by seven ground-based Total Carbon Column Observing Network (TCCON) stations. The average difference between GOSAT and TCCON XCO 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 XCO 2 retrievals of -0.20 ppm with a standard deviation of 2.26 ppm and a correlation coefficient of 0.75. One year of XCO 2 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 XCO 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. 2012. American Geophysical Union.