日本地球惑星科学連合2019年大会

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[J] 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-AS05] 成層圏・対流圏過程とその気候への影響

2019年5月29日(水) 15:30 〜 17:00 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:河谷 芳雄(国立研究開発法人海洋研究開発機構)、渡辺 真吾(国立研究開発法人海洋研究開発機構)、関谷 高志(国立研究開発法人 海洋研究開発機構)、佐藤 薫(東京大学 大学院理学系研究科 地球惑星科学専攻)

[AAS05-P13] 多成分衛星データ同化から得られた上部対流圏・下部成層圏オゾンの評価

*関谷 高志1宮崎 和幸2,1大越智 幸司1須藤 健悟3,1滝川 雅之1 (1.国立研究開発法人 海洋研究開発機構、2.NASAジェット推進研究所/カリフォルニア工科大学、3.名古屋大学 大学院環境学研究科)

キーワード:衛星データ同化、オゾン、大気化学

Ozone (O3) in the upper troposphere and lower stratosphere (UTLS) has a stronger greenhouse effect than in the lower troposphere. However, information on O3 in the UTLS from observations with the global coverage is still limited. Multi-species satellite data assimilation of stratospheric O3, and tropospheric O3 and its precursors is expected to provide better constraints on O3 in the UTLS, because O3 in the UTLS is controlled by stratospheric O3 intrusions, O3 transport from middle and lower troposphere, and in-situ O3 chemical production. In this study, we evaluate O3 in the UTLS derived from the multi-species data assimilation with horizontal resolutions of 2.8, 1.1, and 0.56 degree using ozonesonde observations (not used for data assimilation) in April 2008. Assimilated data were obtained from the OMI, GOME-2, and SCIAMACHY for tropospheric NO2 column, the TES for O3 profile, the MOPITT for total CO column, the MLS for O3 and HNO3 profiles, and the OMI for total SO2 column. At 200 hPa, 300 hPa, and 500 hPa, the data assimilation at 0.56-degree resolution reduced root mean square errors (RMSEs) against ozonesonde observations in the northern midlatitudes by 32%, 31%, and 13%, respectively, compared to the model simulation without data assimilation. The overall data assimilation performance for O3 concentrations is not sensitive to horizontal resolution in the altitudes between 200 hPa and 500 hPa (i.e., the RMSEs were within 7% at all resolutions). Meanwhile, the data assimilation at 0.56-degree resolution improved agreements with ozonesonde observations at 300 hPa by up to 55% compared to 1.1- and 2.8-degree resolutions during a deep stratospheric intrusion episode at Trinidad Head (124°W, 41°N) through resolving small-scale transport processes. These results confirm that O3 analyses derived from multi-species data assimilation are suitable for understanding spatial and temporal variations in O3 in the UTLS and their controlling processes.