日本地球惑星科学連合2019年大会

講演情報

[E] 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-AS03] 大規模な水蒸気場と組織化した雲システム

2019年5月28日(火) 17:15 〜 18:30 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: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)、横井 覚(海洋研究開発機構)、佐藤 正樹(東京大学大気海洋研究所)

[AAS03-P13] Effects of different cloud overlapping parameters on simulated total cloud fraction over the globe and East Asian region

*bo hai Wang1hua Zhang2 (1.Institute of Atmospheric Physics, Chinese Academy of Sciences、2.State Key Laboratory of Severe Weather, Chinese Academy of Meteorological Sciences)

キーワード:Cloud overlapping parameter, Vertical decorrelation length, Total cloud fraction

The cloud overlapping parameter (vertical decorrelation length, Lcf) from CloudSat/CALIPSO is implemented in Beijing Climate Center’s GCM (BCC_AGCM2.0) to reduce the uncertainly in radiation field. Comparing the climate simulation results obtained by using the constant Lcf of 2 km with those using the above retrieved Lcf, it is found that the total cloud fraction simulation has been obviously improved by using the satellite-based Lcf. The error of global mean total cloud fraction between simulations and CERES (Clouds and the Earth's Radiant Energy System) satellite data is decreased by 1.6% in both the winter and summer, of which the positive deviation of total cloud amount at tropical convection area and the negative deviation in subtropical region both are significantly reduced. These improvements are helpful for better simulation of energy budget differences between different regions. In East Asia, using the satellite-based Lcf can decrease the error of average total cloud fraction (compared to the CERES) by 1.8% (1.4%) in the winter (summer).Overall, using Lcf from CloudSat/CALIPSO satellite data can improve the simulation of total cloud fraction and thus obtain more accurate simulation of radiation field.