Column-averaged volume mixing ratios of carbon dioxide and methane retrieved from
the Greenhouse gases Observing SATellite (GOSAT) Short-Wavelength InfraRed observation
(GOSAT SWIR XCO2 and XCH4) were compared with the reference data ob-
5 tained by ground-based high-resolution Fourier Transform Spectrometers (g-b FTSs)
participating in the Total Carbon Column Observing Network (TCCON).
Through calibrations of g-b FTSs with airborne in-situ measurements, the uncertainty
of XCO2 and XCH4 associated with the g-b FTS was determined to be 0.8 ppm
(0.2%) and 4 ppb (0.2%), respectively. The GOSAT products are validated with
10 these calibrated g-b FTS data. Preliminary results are as follows: The GOSAT SWIR
XCO2 and XCH4 (Version 01.xx) are biased low by 8.85±4.75 ppm (2.3±1.2%) and
20.4±18.9 ppb (1.2±1.1%), respectively. The precision of the GOSAT SWIR XCO2
and XCH4 is considered to be about 1%. The latitudinal distributions of zonal means of
the GOSAT SWIR XCO2 and XCH4 show similar features to those of the g-b FTS data.