Variations of Broad-scale Asian summer monsoon circulation and possible causes

摘要：

The widely applied Webster–Yang index (WYI),which measures the broad-scaledynamical features of the Asian summer monsoon (ASM),has experienced robustinterannual and interdecadal variations and a decreasing tendency,with apparentshifts in 1972.The WYI exhibits moderate variability and frequent positive phasesbefore 1972,intensive interannual variability during 1972–98,and an obviousdecreasing tendency and mainly negative phase afterward.The vertical shear easterlyanomalies over the tropics/subtropics and the anomalous vertical shear anticycloniccirculation over Eurasia (Eu) are the background for the decreasing WYI,associatedwith reduced summer precipitation around the Bay of Bengal and Sumatra.

作者: Zhiyan Zuo Renhe Zhang Song Yang

作者单位: Chinese Academy of Meteorological Sciences,Beijing,China Department of Atmospheric Sciences,Sun Yat-sen University,Guangzhou,China

会议类型: 国内会议

会议名称: 第一届中国大地测量和地球物理学学术大会

会议地点: 北京

会议语种:英文

页码: 1-2

在线出版日期: 2014-10-01（万方平台首次上网日期，不代表论文的发表时间）