[A-CG36] 衛星による地球環境観測

[ACG36-08] 多波長多ピクセル法を用いたエアロゾルと海色の同時推定アルゴリズムの更新

*関口 美保¹、中島 映至¹、橋本 真喜子²、Shi Chong³、桃井 裕広⁴ (1.国立大学法人東京海洋大学、2.宇宙航空研究開発機構、3.中国科学院、4.GRASP SAS)

キーワード：衛星解析、エアロゾル、海色

We have developed the simultaneous retrieval method for atmospheric aerosol and water-leaving radiance using satellite-observed radiances in several bands over a group of pixels with inter-pixel constraints. This method, named SIRAW (Simultaneous Retrieval of Aerosol and Water-leaving radiance for ocean retrieval), is enabled to get eight aerosol properties and ocean color over the ocean simultaneously and adopted as the standard aerosol algorithm for GOSAT-2/CAI-2. Although SIRAW has successfully provided valuable atmospheric aerosol properties from CAI-2 observations, several shortcomings were pointed out in ocean products. In this study, we introduce the update of SIRAW. At first, we introduced RPstar3, the latest version of the radiative transfer code, including SIRAW. Secondly, aerosol optical properties and IOPs assumed in this method are updated to that estimated from in-situ observations. At last, we modified the technique to select dark or bright pixels.
This updated SIRAW was used for GCOM/SGLI and GOSAT-2/CAI-2 data to retrieve atmospheric aerosols and water-leaving radiance at AERONET-OC sites and validated with analytical values from in-situ observations. According to the results, the accuracy of this method was better than the previous method.