To map the global column dry mole fractions of carbon dioxide (CO2) and methane (CH4), the Green house gases
Observing SATellite (GOSAT) was launched on January 23, 2009. The Thermal And Near infrared Sensor for carbon
Observation Fourier-Transform Spectrometer (TANSO-FTS) and Cloud and Aerosol Imager (TANSO-CAI) are onboard
on GOSAT to derive the precise amount of CO2 and CH4 in atmosphere measuring the solar light intensity reflected and
scattered on the earth's surface and the thermal radiation. The first high spectral resolution Short Wave Infrared (SWIR)
spectra by TANSO-FTS and the image by TANSO-CAI were acquired on February 7, 2009. TANSO has been
continuously measuring CO2 and CH4 distributions in global every three days periods, and data distribution for public
users was started from February 16, 2010. After the launch, the on-orbit characterization of performance, calibration, and
health monitoring of TANSO has been continuously conducted with updating the Level-1 and -2 processing algorithm.
During the over one-year operation period, a few anomalies such as instability of pointing mechanism, varying offset of
pointing position, small wave-number shift and Zero Path Difference position change, were observed. The radiometric
responses for FTS and CAI are also slightly changing. To minimize these effects in data using, quality flags were
additionally included in product, response functions are updated and the regular operation procedure was slightly
changed. In this presentation, the detail of on-orbit status of TANSO will be reported.