干旱区生态环境知识资源中心

After the 1.5 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/CAI Level 2 and FTS/CAI Level 3 products, 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 to the higher level data processing, GOSAT DHF has several additional roles 1) observation request collection from users and their submission to JAXA 2) Data archive and 3) Data Distribution. After the calibration and preliminary validation, processed data are distributed to RA researchers at first stage. Then, after the validation, they are distributed to General users. All the distribution is through GOSAT User Interface Gateway (GUIG). As of May of 2010, total number of user registration exceeds 800, and a large number of products are distributed both to the RA researchers and to General Users. At this moment, validation indicates that the FTS L2 SWIR CO2 and CH4 data show slightly lower values than validation results.

In addition, very high XCO2 values, which seemed caused by aerosol, appeared on some desert area. But, further improvement of the algorithm was conducted as version 01. XX of FTS L2 products. Preliminary FTS TIR L2 processing is being conducted and TIR processing is starting. In addition to the L2 products, some Level 3 products are going to be released: FTS L3 global distribution of CO2 and CH4, and CAI L3 global radiance distribution.