[A-CG06_29AM2] Satellite Earth Environment Observation

[ACG06-17] GCOM-W1衛星搭載AMSR2プロダクトの現状

*沖 大幹¹、可知 美佐子²、直木 和弘²、堀 雅裕²、前田 崇²、今岡 啓治² (1.東京大学生産技術研究所、2.宇宙航空研究開発機構地球観測研究センター)

キーワード：地球観測, 水循環, 地球物理パラメータ, 検証, データ配布

The Advanced Microwave Scanning Radiometer 2 (AMSR2), on board the first generation satellite of Global Change Observation Mission - Water (GCOM-W1 or "SHIZUKU") satellite, is multi-frequency, total-power microwave radiometer system with dual polarization channels for all frequency bands. The GCOM-W1 satellite was launched on May 18, 2012 (JST), and has started scientific observation since July 3, 2012. After the calibration and validation phase, which confirmed that all the pre-defined release accuracies are satisfied, the AMSR2 bright temperature product (Level 1) and geophysical parameter product (Level 2) were released to public since January 2013 and May 2013, respectively.Monitoring and validation of the AMSR2 geophysical parameters have been continued for further improvements of the observation accuracy in future algorithms. For example, the precipitation product is validated by comparing with the Precipitation Radar (PR) on board the Tropical Rainfall Measuring Mission (TRMM) satellite, and relative errors were 48% over ocean and 88 % over land for the period from September 1, 2012 to August 31, 2013.Quality control (QC) of in-situ data is also improved for the better validation. New QC method for buoy data, which is used in the validation of the sea surface temperature (SST) and sea surface wind speed products, is introduced to remove unreliable in-situ observation data from comparisons, including overlap check, movement speed check, comparison with numerical model, and statistical check by Bayes' theorem. Those efforts will contribute to improve the algorithm for future version-up.The AMSR2 standard products have been distributed through the GCOM-W1 Data Providing Service (https://gcom-w1.jaxa.jp/), and quick look of the products, browse images of all AMSR2 brightness temperatures and geophysical parameters are available at the JAXA Satellite Monitoring for Environmental Studies (JASMES) for Water Cycle (http://kuroshio.eorc.jaxa.jp/JASMES/WC.html).