Recent Progresses in Studies of the Temporal-Spatial Variations of the East Asian Monsoon System and Their Impacts on Climate Anomalies in China
HUANG Ronghui,GU Lei,CHEN Jilong,and HUANG Gang Center for Monsoon System Research,Institute of Atmospheric Physics,Chinese Academy of Sciences,Beijing 100080
Recent progresses in studies of the temporal-spatial variations of the East Asian monsoon(EAM)system and their impacts on severe climate anomalies in China are reviewed in this paper.Many studies have explained that the EAM system is significantly different from the South Asian monsoon(SAM)and North Australian monsoon(NAM)systems either in the vertical structure and the annual cycle of wind field or in the characteristics of water vapor transports and rainfall,thus,this system is a relatively independent subsystem of the Asian-Australian monsoon system.Moreover,the study results have shown that there are obvious temporal-spatial variations in the system.In this system,there exists a significant quasi-biennial oscillation with a characteristic of meridional tripole pattern distribution in the interannual variations of East Asian summer monsoon(EASM)system,and there is a significant weakening trend in the interdecadal variations of the system from the late 1970s,which is particularly obvious in North China.And this is an oscillation with the period of quasi-four years in the interannual variations of East Asian winter monsoon(EAWM)system,and there also exists significant weakening trend in its interdecadal variability of the system,which has caused continuous warm winters from the late 1980s.Further studies have revealed that the variabilities and anomalies of the EAM system are closely associated with the variations of an air-sea-land coupled system and interactions among them.This shows that the EAM system may be viewed as an atmosphere-ocean-land coupled system,referred to the EAM climate system.Besides,a climatological conceptive model of the occurrence of severe floods in the Yangtze River and the Huaihe River valleys and climate background of prolonged droughts in North China are proposed from the above-mentioned interannual and interdecadal variations of the EAM climate system.
【Fund】： 国家自然科学基金资助项目40730952、40575026;; 中国科学院知识创新工程重要方向项目KZCX2-YW-220
【CateGory Index】： P461
【CateGory Index】： P461