During the 2.5 year operation of GOSAT (Greenhouse gases Observing SATellite), NIES GOSAT DHF (GOSAT Data
Handling Facility of National Institute for Environmental Studies) has been producing CAI Level 1B and 1B+, FTS
Level 2 SWIR (column amount of CO2 and CH4), CAI Level 2 (cloud flag ), FTS Level 3 products (global map of XCO2,
XCH4,) and CAI Level 3 (global radiance and global reflectance), receiving FTS Level 1A/1B, and CAI Level 1A data
from JAXA (FTS: Fourier Transform Spectrometer; CAI: Cloud and Aerosol Imager, JAXA: Japan Aerospace
eXploration Agency). In addition, FTS Level 2 TIR are released to RA users. FTS Level 3 TIR, and Level 4A and 4B
products (emission/absorption and 3D global distribution of CO2) will be released in the near future..
Since the FTS Level 2 SWIR data have been accumulated more than 2.5 years, global trends can be observed, while the
validation results show negative bias of 2 to 3 % for CO2 and negative bias of 1 to 2 % for CH4. A comparison with the
results by different algorithms is also conducted.
All the mentioned data products are distributed through a website, the GOSAT User Interface Gateway (GUIG), and
users of the products include the researchers responded to the three Research Announcements (RA) and general users
(GU). Number of the RA users exceeds 100 and that for GU exceeds 1100.