Local atmospheric response to land–sea thermal contrast in an AGCM

小守 信正; 山崎 哲; 吉田 聡

講演情報

[E] ポスター発表

セッション記号 M (領域外・複数領域) » M-IS ジョイント

[M-IS01] Environmental, Socio-Economic and Climatic Changes in Northern Eurasia

2022年6月3日(金) 11:00 〜 13:00 オンラインポスターZoom会場 (27) (Ch.27)

コンビーナ:Pavel Groisman(NC State University Research Scholar at NOAA National Centers for Environmental Information, Asheville, North Carolina, USA)、コンビーナ:Maksyutov Shamil(National Institute for Environmental Studies)、Streletskiy Dmitry A(George Washington University)、コンビーナ:Kukavskaya Elena(V.N. Sukachev Institute of Forest of the Siberian Branch of the Russian Academy of Sciences - separate subdivision of the FRC KSC SB RAS)、座長:谷田貝亜紀代(弘前大学大学院理工学研究科)、Shamil Maksyutov(National Institute for Environmental Studies)、Elena Kukavskaya(V.N. Sukachev Institute of Forest of the Siberian Branch of the Russian Academy of Sciences - separate subdivision of the FRC KSC SB RAS)

11:00 〜 13:00

[MIS01-P10] Local atmospheric response to land–sea thermal contrast in an AGCM

*小守信正¹、山崎哲¹、吉田聡² (1.国立研究開発法人海洋研究開発機構、2.京都大学防災研究所)

キーワード：海陸熱コントラスト、降水、表層風収束

The mechanism of confined precipitation along the coast around the Black and Caspian Seas is numerically investigated with an atmospheric general circulation model (AGCM). By using an appropriate depth of slab model for inland seas instead of a thin and uniform one, the climatological annual cycle of surface temperature is realistically reproduced. It is found that raised surface temperature in winter increases surface wind speed over the seas via the enhanced vertical mixing, and the surface-wind convergence and associated upward wind is strengthened along the downwind rim of the seas, which enhances precipitation along the coast. The opposite mechanism works in summer, which suppresses precipitation there.