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www.atmos-meas-tech-discuss.net/3/4791/2010/
doi:10.5194/amtd-3-4791-2010
© Author(s) 2010. This work is distributed
under the Creative Commons Attribution 3.0 License.
Retrieval algorithm for CO2 and CH4 column abundances from short-wavelength infrared spectral observations by the Greenhouse Gases Observing Satellite
1National Institute for Environmental Studies, 16-2 Onogawa, Tsukuba 305-8506, Japan
2Fujitsu FIP Corporation, National Institute for Environmental Studies, 16-2 Onogawa, Tsukuba 305-8506, Japan
3Laboratoire Interuniversitaire des Systèmes Atmosphériques (LISA, UMR CNRS 7583), Université Paris Est Créteil et Université Paris Diderot, Faculté des Sciences et Technologie, 94010 Créteil Cedex, France
Abstract. The Greenhouse gases Observing SATellite (GOSAT) was launched on 23 January 2009 to monitor the global distributions of carbon dioxide and methane from space. It has operated continuously since then. Here we describe a retrieval algorithm for column abundances of these gases from the short-wavelength infrared spectra obtained by the Thermal And Near infrared Sensor for carbon Observation-Fourier Transform Spectrometer (TANSO-FTS). The algorithm consists of three steps. First, cloud-free observational scenes are selected by several cloud-detection methods. Then, column abundances of carbon dioxide and methane are retrieved based on the optimal estimation method. Finally, the retrieval quality is examined to exclude low-quality and/or aerosol-contaminated results. Most of the retrieval random errors come from the instrumental noise. The interferences by auxiliary parameters retrieved simultaneously with gas abundances are small. The evaluated precisions of the retrieved column abundances for single observations are less than 1% in most cases. The interhemispherical differences and the temporal variation patterns of the retrieved column abundances agree well with the current state of knowledge.
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Notice on Discussion StatusCitation: Yoshida, Y., Ota, Y., Eguchi, N., Kikuchi, N., Nobuta, K., Tran, H., Morino, I., and Yokota, T.: Retrieval algorithm for CO2 and CH4 column abundances from short-wavelength infrared spectral observations by the Greenhouse Gases Observing Satellite, Atmos. Meas. Tech. Discuss., 3, 4791-4833, doi:10.5194/amtd-3-4791-2010, 2010. Bibtex EndNote Reference Manager XML
