Differentiated Cloud-Radiation Characteristics over East Asian Subtropical and Tropical Regions Revealed by CMIP6 Models  

作　　者：WU Rui-xue LI Jian-dong XU Jian-jun ZHANG Yu LIAO Xiao-qing LIU Chun-lei DU Zhen-cai 吴瑞雪;李剑东;徐建军;张宇;廖晓晴;刘春雷;杜振彩

机构地区：[1]Laboratory for Coastal Ocean Variation and Disaster Prediction,College of Ocean and Meteorology,Guangdong Ocean University,Zhanjiang,Guangdong 524088 China [2]CMA-GDOU Joint Laboratory for Marine Meteorology,South China Sea Institute of Marine Meteorology,Guangdong Ocean University,Zhanjiang,Guangdong 524088 China [3]National Key Laboratory of Earth System Numerical Modeling and Application,Institute of Atmospheric Physics,Chinese Academy of Sciences,Beijing 100029 China [4]State Key Laboratory of Severe Weather,Chinese Academy of Meteorological Sciences,Beijing 100029 China [5]Shenzhen Institute of Guangdong Ocean University,Shenzhen,Guangdong 518120 China [6]Institute of Atmospheric Physics,Chinese Academy of Sciences,Beijing 100029 China

出　　处：《Journal of Tropical Meteorology》2025年第1期43-63,共21页热带气象学报(英文版)

基　　金：Guangdong Major Project of Basic and Applied Basic Research(2020B0301030004);National Natural Science Foundation of China(72293604,42275026);Open Grants of the State Key Laboratory of Severe Weather(2023LASW-B09)。

摘　　要：Pronounced climatic differences occur over subtropical South China(SC)and tropical South China Sea(SCS)and understanding the key cloud-radiation characteristics is essential to simulating East Asian climate.This study investigated cloud fractions and cloud radiative effects(CREs)over SC and SCS simulated by CMIP6 atmospheric models.Remarkable differences in cloud-radiation characteristics appeared over these two regions.In observations,considerable amounts of low-middle level clouds and cloud radiative cooling effect appeared over SC.In contrast,high clouds prevailed over SCS,where longwave and shortwave CREs offset each other,resulting in a weaker net cloud radiative effect(NCRE).The models underestimated NCRE over SC mainly due to weaker shortwave CRE and less cloud fractions.Conversely,most models overestimated NCRE over SCS because of stronger shortwave CRE and weaker longwave CRE.Regional CREs were closely linked to their dominant cloud fractions.Both observations and simulations showed a negative spatial correlation between total(low)cloud fraction and shortwave CRE over SC,especially in winter,and exhibited a positive correlation between high cloud fraction and longwave CRE over these two regions.Compared with SCS,most models overestimated the spatial correlation between low(high)cloud fraction and SWCRE(LWCRE)over SC,with larger bias ranges among models,indicating the exaggerated cloud radiative cooling(warming)effect caused by low(high)clouds.Moreover,most models struggled to describe regional ascent and its connection with CREs over SC while they can better reproduce these connections over SCS.This study further suggests that reasonable circulation conditions are crucial to simulating well cloud-radiation characteristics over the East Asian regions.

关 键 词：cloud fraction cloud radiative effect CMIP6 model South China South China Sea 

分 类 号：P422[天文地球—大气科学及气象学]