Abstract book - Prof. Per Jensen, Ph.D. - Bergische Universität ...

Poster session, J24 187Atmospheric Greenhouse Gases Observed with a Fourier TransformSpectrometer onboard GOSAT and Validation of GOSAT DataIsamu Morino 1 , Makoto Inoue 1 , Kumi Nakamae 1 , Yuki Miyamoto 2 , NobuhiroKikuchi 1 , Yukio Yoshida 1 , Tatsuya Yokota 1 , Osamu Uchino 11 National Institute for Environmental Studies (NIES), Japan, morino@nies.go.jp;2 Graduate School of Nature Science and Technology, Okayama University, Japan.The Greenhouse gases Observing SATellite (GOSAT) measures the concentrations ofatmospheric carbon dioxide (CO 2) and methane (CH 4) globally from space for morethan three years. Column-averaged mixing ratios (XCO 2 and XCH 4) are retrieved fromthe Short-Wavelength Infra-Red (SWIR) spectra of Thermal And Near-infrared Sensorfor carbon Observation - Fourier Transform Spectrometer (TANSO-FTS) onboardGOSAT.They are compared with the reference data provided by a network of ground-basedhigh-resolution FTS named TCCON (Total Carbon Column Observing Network) andaircraft measurements by the CONTRAIL (Comprehensive Observation Network forTRace gases by AIrLiner) project, the NOAA (National Oceanic and AtmosphericAdministration) aircraft program, and the NIES airborne sampling project.Preliminary validation of the GOSAT XCO 2 and XCH 4 (ver. 01.xx) released in August2010 was made with the TCCON data. The scatter of the GOSAT XCO 2 and XCH 4 isabout 1 % (1σ) after correcting the negative biases of XCO 2 and XCH 4 by 8.85 ppm and20.4 ppb, respectively 1 . These biases and scatter mainly come from the insufficientaccuracy of the reference databases and the inadequate treatment of aerosol in theretrieval. A new retrieval algorithm modified those points. The new GOSAT XCO 2 andXCH 4 (ver. 02.00) based on the improved retrieval algorithm were compared withreference data. They are greatly improved compared with the ver. 01.xx of GOSATXCO 2 and XCH 4.Morino I.Inoue M.Nakamae K.Miyamoto Y.Kikuchi N.Yoshida Y.Yokota T.Uchino O.References[1] I. Morino, O. Uchino, M. Inoue, Y. Yoshida, T. Yokota, P. O. Wennberg, G. C.Toon, D. Wunch, C. M. Roehl, J. Notholt, T. Warneke, J. Messerschmidt, D. W. T.Griffith, N. M. Deutscher, V. Sherlock, B. Connor, J. Robinson, R. Sussmann, and M.Rettinger, Atmos. Meas. Tech., 4, 1061-1076, 2011.