日本地球惑星科学連合2023年大会

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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] 大規模な水蒸気場と組織化した雲システム

2023年5月26日(金) 13:45 〜 15:15 201A (幕張メッセ国際会議場)

コンビーナ:高須賀 大輔(東京大学大気海洋研究所)、横井 覚(海洋研究開発機構)、三浦 裕亮(国立大学法人 東京大学大学院 理学系研究科 地球惑星科学専攻)、濱田 篤(富山大学)、座長:高須賀 大輔(東京大学大気海洋研究所)、濱田 篤(富山大学)

14:45 〜 15:00

[AAS05-05] Topographic and resolution impact on the convection over the Philippine islands

*梶川 義幸1,2、山浦 剛2 (1.神戸大学 都市安全研究センター、2.理化学研究所 計算科学研究センター)

キーワード:対流活動、島嶼域、地形、解像度

Philippine islands are located in the convection center driving the general circulation during boreal summer. Of great importance is to represent the convection over the Philippines accurately in the global circulation model. Since the Philippines are characterized by many small islands and precipitous mountains, it is worthwhile to figure out the necessary resolution and process for better simulating the convection in the model. In this study, we conducted the sensitivity experiments of the convections over the Philippines during boreal summer to examine the impact of (1) horizontal resolution and (2) topography by using SCALE-RM (http://r-ccs-climate.riken.jp/scale/index.html); we adopted 45km and 25km resolution and set up the 25km atmosphere resolution with 45km resolution topography. Each experiment is integrated 10 years as a preliminary experiment. The results indicate that the total precipitation amount increase with higher horizontal resolution. The impact of topography is larger in the precipitation produced by Microphysics anchored in steep mountains. On the other hand, higher horizontal resolution affects less precipitation over the South China sea produced by cumulus parameterization (Kain-Fitch scheme). Intensified tropical cyclones and newly generated tropical disturbance in the simulation with higher atmospheric resolution contribute to the increase of precipitation over the Philippines. The effects of the calculation domain size will be also discussed.