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European Geosciences Union, Atmospheric Measurement Techniques, 6(4), p. 1061-1076, 2011

DOI: 10.5194/amt-4-1061-2011

European Geosciences Union, Atmospheric Measurement Techniques Discussions, 6(3), p. 5613-5643

DOI: 10.5194/amtd-3-5613-2010

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Preliminary validation of column-averaged volume mixing ratios of carbon dioxide and methane retrieved from GOSAT short-wavelength infrared spectra

Journal article published in 2010 by I. Morino ORCID, O. Uchino, M. Inoue ORCID, Y. Yoshida, T. Yokota, P. O. Wennberg, G. C. Toon, D. Wunch, C. M. Roehl, J. Notholt ORCID, T. Warnecke, T. Warneke, J. Messerschmidt, D. W. T. Griffith, N. M. Deutscher and other authors.
This paper is made freely available by the publisher.
This paper is made freely available by the publisher.

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Abstract

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 obtained 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 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.