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

Creators: Morino, I.; Uchino, O.; Inoue, M.; Yoshida, Y.; Yokota, T.; Wennberg, P. O.; Toon, G. C.; Wunch, D.; Roehl, C. M.; Notholt, J.; Warneke, T.; Messerschmidt, J.; Griffith, D. W. T.; Deutscher, N. M.; Sherlock, V.; Connor, B.; Robinson, J.; Sussman, R.; Rettinger, M.

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 X_(CO_2) and X_(CH_4) were compared with the reference calibrated data obtained by ground-based high-resolution Fourier Transform Spectrometers (g-b FTSs) participating in the Total Carbon Column Observing Network (TCCON). Preliminary results are as follows: the GOSAT SWIR X_(CO_2) and X_(CH_4) (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 standard deviation of the GOSAT SWIR XCO2 and XCH4 is about 1 % (1 σ) after correcting the negative biases of X_(CO_2) and X_(CH_4) by 8.85 ppm and 20.4 ppb, respectively. The latitudinal distributions of zonal means of the GOSAT SWIR X_(CO_2) and X_(CH_4) show similar features to those of the g-b FTS data except for the negative biases in the GOSAT data.

Additional Information

© 2011 Author(s). Published by Copernicus Publications on behalf of the European Geosciences Union. This work is distributed under the Creative Commons Attribution 3.0 License. Received: 26 November 2010; Published in Atmos. Meas. Tech. Discuss.: 8 December 2010. Revised: 25 April 2011; Accepted: 19 May 2011; Published: 15 June 2011. We express our sincere thanks to the members of the NIES GOSAT project office, data algorithm team, atmospheric transport modeling team for their useful comments. We thank Nobuyuki Kikuchi in NIES and Komei Yamaguchi in the Japan Weather Association for plotting the data. We would like to thank anonymous referees and the associated editor for improving this paper. This work was funded by the Ministry of the Environment in Japan. We also thank NASA's Terrestrial Ecology Program and the Orbiting Carbon Observatory for their support of TCCON, and acknowledge support from the EU within the projects GEOMON and IMECC. The Lauder TCCON measurements are funded by New Zealand Foundation for Research, Science and Technology contracts CO1X0204 and CO1X0406. We thank the members of RAMCES team at LSCE (Gif-sur-Yvette) for maintaining the FTS at the Trainou station and providing station logistics. Edited by: G. Stiller.

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