日本地球惑星科学連合2019年大会

講演情報

[E] ポスター発表

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-CG34] 衛星による地球環境観測

2019年5月30日(木) 17:15 〜 18:30 ポスター会場 (幕張メッセ国際展示場 8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)、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)

[ACG34-P04] Concept of small satellite UV/visible imaging spectrometer optimized for tropospheric NO2 measurements in air quality monitoring

*環 藤縄1,5Noguchi Katsuyuki2Kuze Akihiko3Richter Andreas4Burrows John4Meier Andreas4Sato Tomohiro1Kuroda Takeshi1Yoshida Naohiro5KASAI YASUKO1,5 (1.National Institute of Information and Communications Technology、2.Nara Women's University、3.Japan Aerospace Exploration Agency、4.University of Bremen、5.Tokyo Institute of Technology)

キーワード:Nitrogen dioxide、Earth observation、Radiative transfer model、Remote sensing

Satellite observations at nadir can potentially facilitate a better understanding of the emissions and distribution of tropospheric nitrogen dioxide, NO2. The identification of emissions requires adequate spatiotemporal resolution measurements of the total column amounts of NO2. The spatial resolution of previous and current observations is insufficient for the identification of NO2 hot-spots. Switching to a spatial resolution of ~1 km x ~1 km can improve the identification of local sources of NO2 and their emissions. To investigate the feasibility of observations with such a high spatial resolution, we simulated radiance spectra for different cases under varying parameters, such as area, season, satellite altitude, and surface reflectance by using the radiative transfer model SCIATRAN. We subsequently retrieved NO2 slant column densities (SCDs) using the differential optical absorption spectroscopy (DOAS) technique with several fit windows. For test cases associated with polluted conditions, we found that the conceptual nadir-observing instrument on a satellite at an altitude of ~300 km involved the lowest retrieval errors for signal-to-noise ratios of around 1000 with accuracy better than the required 5% for tropospheric NO2 SCD and that the fit window of 425--497 nm met the scientific requirements for both surface reflectance cases.