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Status of GOSAT post-launch calibration

Kei Shiomi(1), Tomoko Kina(2), Shuji Kawakami(2), Yasushi Mitomi(3), Mayumi Yoshida(3), Fumie Kataoka(3), Riko Higuchi(3) and Nami Sekio(3)

(1) Japan Aerospace Exploration Agency, 2-1-1 Sengen, Tsukuba, Ibaraki, 305-8505, Japan
(2) Japan Aerospace Explation Agency, 2-1-1 Sengen, Tsukuba, Ibaraki, 305-8505, Japan
(3) Remote Sensing Technology Center of Japan, 1-6-1 Takezono, Tsukuba, Ibaraki, 305-0032, Japan

Abstract

The Greenhouse Gases Observing Satellite (GOSAT) was launched on January 23, 2009. The GOSAT is a joint project of JAXA, MOE and NIES to monitor greenhouse gases such as CO2 and CH4 from space. The GOSAT carries 2 science instruments of the Fourier Transform Spectrometer (TANSO-FTS) and the Cloud and Aerosol Imager (TANSO-CAI). The FTS covers wide wavelength range from SWIR to TIR by simultaneous observations with high spectral resolution of 0.2 cm-1. The FTS has 3 polarized SWIR bands, which are 0.76, 1.6 and 2.0 microns of O2, CO2, and CH4 absorptions. The TIR band observes from 5.5 to 14.3 microns, which includes CO2, CH4, O3 and H2O absorptions. The FTS observes globally with grid points of 10 km FOV by separate pointing. The CAI is carried 4 radiometers of 0.38, 0.68, 0.87, and 1.62 microns to detect cloud and aerosol interference in the FTS FOV with high spatial resolution and wide swath of 1000 km. Initial check-out is scheduled to be operated in 3 months after the launch. Initial calibration and validation will follow in 3 months. The TANSO Level 1 products will be implemented as released version. On-orbit sensor characterizations are evaluated after the initial check-out activity. Radiometric, geometric, and spectral accuracies are evaluated after the initial calibration activities and the Level 1 products will be improved by reflection of calibration results. This paper shows the results of post-launch calibration after initial calibration and validation phase.

 

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