High Cloud Responses to Global Warming Simulated by Two Different Cloud Microphysics Schemes Implemented in the Nonhydrostatic Icosahedral Atmospheric Model (NICAM)

Chen Ying-Wen; 清木 達也; 小玉 知央; 佐藤 正樹; 野田 暁; 山田 洋平

講演情報

インターナショナルセッション（口頭発表）

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-AS02] High performance computing of next generation weather, climate, and environmental sciences using K

2016年5月22日(日) 13:45 〜 15:15 302 (3F)

コンビーナ:*佐藤正樹(東京大学大気海洋研究所)、木本昌秀(東京大学大気海洋研究所)、斉藤和雄(気象研究所予報研究部)、瀬古弘(気象研究所)、三好建正(理化学研究所計算科学研究機構)、田村哲郎(東京工業大学大学院総合理工学研究科)、新野宏(東京大学大気海洋研究所海洋物理学部門海洋大気力学分野)、滝川雅之(独立行政法人海洋研究開発機構)、富田浩文(理化学研究所計算科学研究機構)、小玉知央(独立行政法人海洋研究開発機構)、座長:小玉知央(独立行政法人海洋研究開発機構)

15:00 〜 15:15

[AAS02-06] High Cloud Responses to Global Warming Simulated by Two Different Cloud Microphysics Schemes Implemented in the Nonhydrostatic Icosahedral Atmospheric Model (NICAM)

*Chen Ying-Wen¹、清木達也¹、小玉知央¹、佐藤正樹^1,2、野田暁¹、山田洋平^1,2 (1.独立行政法人　海洋研究開発機構、2.東京大学　大気海洋研究所)

キーワード：Cloud Feedback

This study examines cloud responses to global warming using a global nonhydrostatic model with two different cloud microphysics schemes. The cloud microphysics schemes tested here are the single- and double-moment schemes with six water categories: these schemes are referred to as NSW6 and NDW6, respectively. Simulations of one year for NSW6 and one boreal summer for NDW6 are performed using the nonhydrostatic icosahedral atmospheric model with a mesh size of approximately 14 km. NSW6 and NDW6 exhibit similar changes in the visible cloud fraction under conditions of global warming. The longwave (LW) cloud radiative feedbacks in NSW6 and NDW6 are larger than the average LW cloud radiative feedbacks in the Coupled Model Intercomparison Project Phase 5 (CMIP5)/Cloud Feedback Model Intercomparison Project 2 (CFMIP2). The LW cloud radiative feedbacks are mainly attributed to cirrus clouds, which prevail more in the tropics under global warming conditions. For NDW6, the LW cloud radiative feedbacks from cirrus clouds also extend to mid-latitudes. The changes in cirrus clouds and their effects on LW cloud radiative forcing (LWCRF) are assessed based on changes in the effective radii of ice hydrometeors (R_ei) and the cloud fraction. We determined that an increase in R_ei has a non-negligible impact on LWCRF compared with an increase in cloud fraction.