Preliminary results of the column abundances of global carbon dioxide and methane obtained from Greenhouse gases Observing SATellite (GOSAT)
Yukio Yoshida(1), Yoshifumi Ota(1), Nawo Eguchi(1), Tomoaki Tanaka(1), Isamu Morino(1), Osamu Uchino(1), Nobuhiro Kikuchi(2), Koji Nobuta(2), Hiroshi Watanabe(1) and Tatsuya Yokota(1)
(1) National Institute for Environmental Studies, 16-2 Onogawa, Tsukuba, 305-8506, Japan
(2) Fujitsu FIP Corporation, 16-2 Onogawa, Tsukuba, 305-8506, Japan
The Greenhouse gases Observing SATellite (GOSAT) was successfully launched on January 23, 2009. The main target of the GOSAT observation is obtaining global distribution of carbon dioxide and methane abundances. Thermal And Near infrared Sensor for carbon Observation-Fourier Transform Spectrometer (TANSO-FTS) detects the signal of reflected solar light on the earth's surface as well as that of thermal emitted radiance from the surface and the atmosphere. TANSO-Cloud and Aerosol Imager (TANSO-CAI) is a radiometer to obtain the information on cloud and aerosols that contaminate the FTS signals. TANSO-FTS has three short-wavelength infrared (SWIR) bands at 0.76, 1.6, and 2.0 micron. Column abundances of carbon dioxide and methane are retrieved globally from SWIR spectra obtained from TANSO-FTS, except for the cloudy regions detected by TANSO-CAI and TANSO-FTS itself.
From the middle of April 2009 after the initial check-out of the satellite and the onboard sensors, continuous observation by TANSO started. At the present, the calibration of TANSO is underway by the Japan Aerospace Exploration Agency (JAXA) who has owned the responsibilities of satellite launch, operation, and sensor calibration. At the same time, the National Institute for Environmental Studies (NIES), who has owned the responsibility of higher-level data processing, has started retrieving and validating the column abundances of carbon dioxide and methane from observed SWIR spectra with TANSO-FTS. Some preliminary results will be presented.