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Influence of differences in current GOSAT X CO 2 retrievals on surface flux estimation

2014; American Geophysical Union; Volume: 41; Issue: 7 Linguagem: Inglês

10.1002/2013gl059174

1944-8007

Hiroshi Takagi, Sander Houweling, R. J. Andres, Dmitry Belikov, Аndrey Bril, Hartmut Boesch, A. Butz, Sandrine Guerlet, Otto Hasekamp, Shamil Maksyutov, Isamu Morino, Tomohiro Oda, C. O’Dell, Sergey Oshchepkov, Robert J. Parker, Makoto Saito, Osamu Uchino, Tatsuya Yokota, Yukio Yoshida, Vinu Valsala,

Geochemistry and Geologic Mapping

We investigated differences in the five currently-available datasets of column-integrated CO2 concentrations () retrieved from spectral soundings collected by Greenhouse gases Observing SATellite (GOSAT) and assessed their impact on regional CO2 flux estimates. We did so by estimating the fluxes from each of the five datasets combined with surface-based CO2 data, using a single inversion system. The five datasets are available in raw and bias-corrected versions, and we found that the bias corrections diminish the range of the five coincident values by ~30% on average. The departures of the five individual inversion results (annual-mean regional fluxes based on -surface combined data) from the surface-data-only results were close to one another in some terrestrial regions where spatial coverage by each dataset was similar. The mean of the five annual global land uptakes was 1.7 ± 0.3 GtC yr−1, and they were all smaller than the value estimated from the surface-based data alone.