JpGU-AGU Joint Meeting 2017

講演情報

[JJ] 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-CG49] [JJ] 地球惑星科学における航空機観測利用の推進

2017年5月21日(日) 10:45 〜 12:15 ポスター会場 (国際展示場 7ホール)

コンビーナ:高橋 暢宏(名古屋大学 宇宙地球環境研究所)、小池 真(東京大学大学院 理学系研究科 地球惑星科学専攻)、鈴木 力英(海洋研究開発機構 地球表層物質循環研究分野)、町田 敏暢(国立環境研究所)

[ACG49-P01] 温室効果ガス観測技術衛星GOSATにおける航空機観測

*久世 暁彦1須藤 洋志1塩見 慶1片岡 文恵4Iraci Laura2Knuteson Robert3Harlow Chawn5Murray Jonathan6菊地 信弘1橋本 真喜子1Yates Emma2Tanaka Tomoaki2Gore Warren2 (1.宇宙航空研究開発機構、2.NASA Ames Reseach Center、3.University of Wisconsin、4.リモートセンシング技術センター、5.The Met Office、6.Imperial College London)

キーワード:GOSAT、TANSO-FTS、ARIES、AJAX、S-HIS

The Greenhouse gases Observing SATellite (GOSAT) is the first satellite program designed to accurately and precisely monitor carbon dioxide (CO2) and methane (CH4) from space. In-situ and remote optical measurements onboard airplanes have made GOSAT a successful mission as described below.
(1) Demonstration of GHG column density retrieval from solar scattered light
At the beginning of the GOSAT program, we installed a breadboard model to a high altitude airplane to acquire spectra and to detect and correct light path modifications by aerosols and clouds. We acquired high resolution spectra of O2A, CO2, and CH4 at SWIR, but validation without a simultaneous aerosol Lidar measurement was not possible.
(2) TIR radiometric, spectroscopic and polarimetric calibrations
GOSAT observes wide spectral range radiation between 650 and 1800 cm-1 from both the surface and the atmosphere. Double difference comparison using spectra acquired by GOSAT, airplanes, and forward calculation can remove model-dependent errors. S-HIS-FTS by the University of Wisconsin onboard ER-2 at 25 km flown over the hot desert of Railroad Valley (RRV) and S-HIS and the Met Office ARIES FTS operated onboard FAAM flown over cold Greenland provided calibration data for detector non-linearity correction. Additionally, high spectral resolution data from air-borne FTSs validated spectroscopic and polarimetric calibrations.
(3) Validation of GHG vertical profile
A multiplex advantage of GOSAT-FTS can cover both solar scattered light at the SWIR band for column density and thermal radiation from the atmosphere at the TIR band for profile retrieval. NASA Ames’s Alpha Jet Atmospheric eXperiment (AJAX) uses a Picarro spectrometer for the in-situ vertical spiral profiling of CO2 and CH4 from the surface to the upper troposphere and coincident flight data for GOSAT over RRV.
In addition to the above applications, airplanes can provide plume emissions with a higher spatial scale to validate amount from point sources.