Southern Hemisphere mean zonal wind in upper troposphere and East Asian summer monsoon circulation  

作　　者：WANG Huijun FAN Ke 

机构地区：[1]Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing 100029, China [2]Department of Atmospheric Science, Yunnan University, Kunming 650091, China

出　　处：《Chinese Science Bulletin》2006年第12期1508-1514,共7页

基　　金：This work was jointly supported by the Chinese Academy of Sciences(Grant No.KZCX3-SW-221);the National Natural Science Foundation of China(Grant No.40620130113);International Partnership Project of the Chinese Academy of Sciences.

摘　　要：Rlationship between the Southern Hemisphere upper troposphere zonal wind variability and the East Asian summer monsoon was studied. The mean zonal wind difference in 150 hPa between 60°S and 30°S is defined as an index (ISH). The re- search reveals that ISH is negatively correlated with the East Asian summer monsoon (EASM) circulation in the interannual scale. It is also suggested that the meridional teleconnection in the zonal wind field, with the main part in Eastern Hemisphere, from mid-and- high latitudes in the Southern Hemisphere to the tropical region is responsible for the ISH-EASM link- age. The teleconnection may result in changes of the wind fields and pressure system changes causing variability of the East Asian monsoon. In addition, the anomalous teleconnection pattern in Eurasia is likely to be another mechanism. ISH and EASM circulation are found to have both simultaneous and lag correla- tions, thus, the relationship has implications for sea- sonal climate prediction over East Asia.Rlationship between the Southern Hemisphere upper troposphere zonal wind variability and the East Asian summer monsoon was studied. The mean zonal wind difference in 150 hPa between 60°S and 30°S is defined as an index （ISH）. The research reveals that ISH is negatively correlated with the East Asian summer monsoon （EASM） circulation in the interannual scale. It is also suggested that the meridional teleconnection in the zonal wind field, with the main part in Eastern Hemisphere, from mid-and- high latitudes in the Southern Hemisphere to the tropical region is responsible for the ISH-EASM linkage. The teleconnection may result in changes of the wind fields and pressure system changes causing variability of the East Asian monsoon. In addition, the anomalous teleconnection pattern in Eurasia is likely to be another mechanism. ISH and EASM circulation are found to have both simultaneous and lag correlations, thus, the relationship has implications for seasonal climate prediction over East Asia.

关 键 词：南半球 对流层 东亚 季风 

分 类 号：P425[天文地球—大气科学及气象学]