Decomposition of Fast and Slow Cloud Responses to Quadrupled CO_(2)Forcing in BCC–AGCM2.0 over East Asia  

作　　者：Xixun ZHOU Bing XIE Hua ZHANG Jingyi HE Qi CHEN 

机构地区：[1]State Key Laboratory of Severe Weather,Chinese Academy of Meteorological Sciences,Beijing 100081,China [2]University of Chinese Academy of Sciences,Beijing 100049,China [3]Laboratory for Climate Studies of China Meteorological Administration,National Climate Center,Beijing 100081,China

出　　处：《Advances in Atmospheric Sciences》2022年第12期2188-2202,共15页大气科学进展（英文版）

基　　金：supported by the National Key R&D Program of China(2017YFA0603502);the National Natural Science Foundation of China(Grant No.41905081);S&T Development Fund of CAMS(2021KJ004&2022KJ019).

摘　　要：In this study,the decomposed fast and slow responses of clouds to an abruptly quadrupled CO_(2)concentration(approximately 1139 ppmv)in East Asia(EA)are obtained quantitatively by using a general circulation model,BCC–AGCM2.0.Our results show that in the total response,the total cloud cover(TCC),low cloud cover(LCC),and high cloud cover(HCC)all increased north of 40°N and decreased south of 40°N except in the Tibetan Plateau(TP).The mean changes of the TCC,LCC,and HCC in EA were–0.74%,0.38%,and–0.38%in the total response,respectively;1.05%,–0.03%,and 1.63%in the fast response,respectively;and–1.79%,0.41%,and–2.01%in the slow response,respectively.By comparison,we found that changes in cloud cover were dominated by the slow response in most areas in EA due to the changes in atmospheric temperature,circulation,and water vapor supply together.Overall,the changes in the cloud forcing over EA related to the fast and slow responses were opposite to each other,and the final cloud forcing was dominated by the slow response.The mean net cloud forcing(NCF)in the total response over EA was–1.80 W m^(–2),indicating a cooling effect which partially offset the warming effect caused by the quadrupled CO_(2).The total responses of NCF in the TP,south China(SC),and northeast China(NE)were–6.74 W m^(–2),6.11 W m^(–2),and–7.49 W m^(–2),respectively.Thus,the local effects of offsetting or amplifying warming were particularly obvious.

关 键 词：cloud cover cloud forcing quadrupled CO_(2) fast and slow responses 

分 类 号：P426.5[天文地球—大气科学及气象学]