日本地球惑星科学連合2023年大会

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[J] オンラインポスター発表

セッション記号 A (大気水圏科学) » A-AS 大気科学・気象学・大気環境

[A-AS07] 大気化学

2023年5月23日(火) 09:00 〜 10:30 オンラインポスターZoom会場 (3) (オンラインポスター)

コンビーナ:坂本 陽介(京都大学大学院地球環境学堂)、内田 里沙(一般財団法人 日本自動車研究所)、石戸谷 重之(産業技術総合研究所)、岩本 洋子(広島大学大学院統合生命科学研究科)

現地ポスター発表開催日時 (2023/5/22 17:15-18:45)

09:00 〜 10:30

[AAS07-P11] Considering aerosol effects for better accuracy of tropospheric NO2 retrieval from GOSAT-GW

*林 顯光1谷本 浩志1、藤縄 環1杉田 考史1金谷 有剛2滝川 雅之2入江 仁士3 (1.国立環境研究所、2.海洋研究開発機構、3.千葉大学)

キーワード:二酸化窒素、鉛直カラム濃度、GOSAT-GW

Vertical column densities (VCD) of tropospheric nitrogen dioxide (NO2) retrieved from earth-observing satellites have been extensively used to analyze emissions of nitrogen oxides (NOx) from anthropogenic and natural sources, including the magnitude, trends, and variability. In general, the retrieval of the tropospheric NO2 VCD is made by dividing the tropospheric slant column density (SCD) by the tropospheric air mass factor (AMF), which is derived by the radiative transfer modeling (RTM). The AMF calculation provides the dominant source of errors in the retrieved NO2 VCD, in particular, over polluted areas, with important consequences on the emission constraints. Hence, it is necessary to accurately consider the aerosol information, surface reflectance, and cloud fraction along with the NO2 vertical profile, all of which are used in the RTM. In order to achieve the better accuracy of the NO2 VCD from the observations by the Global Observing SATellite for Greenhouse gases and Water cycle (GOSAT-GW) satellite to be launched in 2024, we aim to better estimate the tropospheric AMF. In this work, we used the TROPOMI dataset as proxy data and calculated the AMF considering aerosol-related variables using a linearized pseudo-spherical vector discrete ordinate radiative transfer code (VLIDORT) version 2.7. Our AMFs and tropospheric NO2 VCDs were evaluated with the TROPOMI operational products and the ground-based Multi-Axis Differential Optical Absorption Spectroscopy (MAX-DOAS) observations.