Abstract
The Greenhouse gases Observing SATellite (GOSAT) monitors atmospheric carbon dioxide (CO2) and methane (CH4) globally from space since February 7, 2009. The Thermal And Near infrared Sensor for carbon Observation Fourier-Transform Spectrometer (TANSO-FTS) and Cloud and Aerosol Imager (TANSO-CAI) acquire global data every three days. Onboard and vicarious calibrations have been performed, and differences from the pre-launch tests have been analyzed. The resulting radiometric, geometric, spectroscopic, and polarimetric characterizations are presented. In addition, we describe the recent status of on-orbit instrument parameters such as pointing accuracy, interferogram quality, and micro-vibration. Finally, the TANSO-FTS Level 1 data processing and correction algorithm and its updates on the ground are presented. The two-year on-orbit operations on orbit are summarized in chronological order.
