日本地球惑星科学連合2018年大会

講演情報

[EE] ポスター発表

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

[A-CG36] 衛星による地球環境観測

2018年5月24日(木) 10:45 〜 12:15 ポスター会場 (幕張メッセ国際展示場 7ホール)

コンビーナ:沖 理子(宇宙航空研究開発機構)、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、共同)、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)、Allen HL Huang (University of Wisconsin Madison)

[ACG36-P01] GCOM-C(しきさい)偏光観測の初期画像と校正計画

*宮崎 理紗1村上 浩1堀 雅裕1 (1.宇宙航空研究開発機構)

キーワード:GCOM-C、SGLI、偏光

The purpose of the GCOM (Global Change Observation Mission) project is conducting global and long-term observations of the earth’s environment from space. Its main role is to observe water circulation and climate change, and monitor the earth’s health from space. The GCOM-C, which is one of the two series of satellites for GCOM system (GCOM-C and GCOM-W), has been launched successfully at 10:26 a.m. (local time) on 23th Dec. 2017 from the Tanegashima Space Center by H-IIA vehicle No.37. The first images of GCOM-C, which were obtained by using the test radio wave transmitted from GCOM-C on 1st to 6th Jan. 2018, has been released from JAXA on Jan. 12th. For the three months after launch as the initial checkout phase, performance check and calibration of the sensor is carried out.

SGLI (Second generation GLobal Imager), which is equipped on GCOM-C is a multi-band optical imaging radiometer with 19 spectral channels that can measure light intensity from near ultraviolet to thermal infrared (380nm to 12um) radiation reflected or emitted on the earth. SGLI consists of two radiometer components: VNR (Visible and Near Infrared Radiometer) and IRS (InfraRed Scanning radiometer).The optical unit is comprised of a non-polarized light (NP) observation sensor with 11 channels from 380nm to 868.5nm that scans areas in the nadir direction, and a polarized light (PL) observation sensor with 2 channels of 673.5nm and 868.5nm that can provide multi-angle observations by switching to directional angles ranging from +45 to -45 degree.

The PL unit can be observed at a resolution of 1km with a swath width of approximately 1150km. Polarization observations, measured at 0, 60 and 120 degree for polarization angles, are calculated using the Stokes parameters: I, Q and U. It is especially expected to enable to retrieve land aerosol using polarization and ultraviolet (380nm) band with higher accuracy because the advantage of using these bands is mainly their little dependency on the surface reflectance. We will introduce the method of the SGLI polarization observation and the calibration plan of the polarization sensitivity for NP and PL sensor.