Level 1 algorithms for TANSO on GOSAT: processing and on-orbit calibrations
1Japan Aerospace Exploration Agency, Tsukuba-city, Ibaraki, Japan
2NEC Toshiba Space Systems, Ltd., Fuchu, Tokyo, Japan
3NEC Informatec Systems, Ltd., Kawasaki-City, Kanagawa Japan
4Remote Sensing Technology Center of Japan, Tsukuba-city, Ibaraki, Japan
Abstract. The Thermal And Near infrared Sensor for carbon Observation Fourier-Transform Spectrometer (TANSO-FTS) onboard the Greenhouse gases Observing SATellite (GOSAT)(nicknamed "Ibuki") has been providing global space-borne observations of carbon dioxide (CO2) and methane (CH4) since 2009. In this paper, first, the most recent operational Level 1 algorithms to produce the spectral radiance from the acquired interferogram are described. Second, we will describe the on-orbit characteristics and calibrations of TANSO-FTS. Overall functions and performances such as signal to noise ratio and spectral resolution are within design objectives. Correction methods of small on-orbit degradations and anomalies, which have been found since the launch are described. Lastly, calibrations of TANSO Cloud and Aerosol Imager (TANSO-CAI) are summarized. However, the Level 1B algorithms of TANSO-CAI are not mentioned, here in this paper.