日本地球惑星科学連合2022年大会

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[E] 口頭発表

セッション記号 A (大気水圏科学) » A-CG 大気海洋・環境科学複合領域・一般

[A-CG38] 衛星による地球環境観測

2022年5月23日(月) 10:45 〜 12:15 104 (幕張メッセ国際会議場)

コンビーナ:沖 理子(宇宙航空研究開発機構)、コンビーナ:本多 嘉明(千葉大学環境リモートセンシング研究センター)、高薮 縁(東京大学 大気海洋研究所)、コンビーナ:松永 恒雄(国立環境研究所地球環境研究センター/衛星観測センター)、座長:村上 浩(宇宙航空研究開発機構地球観測研究センター)

11:45 〜 12:00

[ACG38-11] Evaluation of SGLI cloud products using SKYNET surface observation data

*Pradeep Khatri1Tadahiro Hayasaka1Hitoshi Irie2、Husi Letu3Takashi Nakajima4Hiroshi Ishimoto5、Tamio Takamura2 (1.Center for Atmospheric and Oceanic Studies,Tohoku University、2.Center for Environmental Remote Sensing, Chiba University, Chiba, Japan、3.Institute of Remote Sensing and Digital Earth, Chinese Academy of Sciences, Beijing, China、4.Research and Information Center (TRIC), Tokai University, Hiratsuka, Japan、5.Meteorlogical Research Institute, Tsukuba, Japan)

キーワード:SGLI , Cloud product, SKYNET, quality assessment, global irradiance

This study uses data about clouds and global irradiances observed from the Earth’s surface using a sky radiometer and a pyranometer, respectively, belonging to SKYNET to understand the quality of the two most fundamental cloud properties—cloud optical depth (COD) and cloud-particle effective radius (CER)—of both water and ice clouds. The SGLI-observed COD agrees well with values observed from the surface, although it agrees better for water clouds than for ice clouds, while the SGLI-observed CER exhibits poorer agreement than does the COD, with the SGLI values being generally higher than the sky radiometer values. These comparisons between the SGLI and sky radiometer cloud properties are found to differ for different cloud types of both the water and ice cloud phases and different solar and satellite viewing angles by agreeing better for relatively uniform and flat cloud type and for relatively low solar zenith angle. Furthermore, it is found that the SGLI-observed cloud properties reproduce global irradiances quite satisfactorily for both water and ice clouds by resembling several important features of the COD comparison, such as the better agreement for water clouds than for ice clouds and the tendency to underestimate (resp. overestimate) the COD in SGLI observations for optically thick (resp. thin) clouds.