ENSO与中国东部夏季降水的关联  

THE RELATIONSHIPS BETWEEN ENSO AND JJA RAINFALL OVER THE EAST OF CHINA

作　　者：张礼平[1] 张乐飞[2] 曾凡平[3] 

机构地区：[1]武汉区域气候中心,湖北武汉430074 [2]武汉大学测绘遥感信息工程国家重点实验室,湖北武汉430079 [3]中国科学院武汉病毒研究所,湖北武汉430079

出　　处：《热带气象学报》2012年第2期177-186,共10页Journal of Tropical Meteorology

基　　金：国家科技支撑项目(2009BAC51B05);湖北省气象局科技发展基金重点项目(2011Z03)共同资助

摘　　要：计算1月减6月El Ni o 3.4指数与6—8月平均200、850 hPa风场的相关矢量,分析中等或强ElNi o/La Ni a事件后的夏季(6—8月)中国东部降水异常分布、西太平洋副热带高压异常特征。结果表明,对ENSO的响应,无论高、底层大气环流还是西太平洋副热带高压,1970年代中期气候突变后变为更敏感。主要表现在:对衰减的El Ni o的响应,夏季南亚高压偏东,西太平洋副热带高压偏强、偏西、偏南,印度季风、南海季风减弱,黄河下游以南副热带季风增强。黄河中下游及以南形成异常环流辐合带,由El Ni o导致的降水正异常最有可能出现在这一西南-东北的带状区域。对衰减的La Ni a响应大致相反。Related vectors for the difference between January and June of El Ni？o 3.4 and JJA 200 hPa and 850 hPa winds are calculated,and both JJA anomalous rainfall over the east of China and the west Pacific subtropical high after medium or strong El Ni？o/La Ni？a events are analyzed.The results indicated that at either high-or low-level circulation,the west Pacific subtropical high is sensitive to ENSO after the mid-1970s.In response to a decaying El Ni？o,the South Asian High is eastward in JJA,the west Pacific subtropical high is strong and located westward and southward,South China Sea summer monsoon and Indian monsoon are weakening,subtropical monsoon over on the south of the lower reach of the Yellow River is strong.Convergence zones of anomalous circulation are over the middle and lower reaches of the Yellow River and areas to its south.Anomalous JJA rainfall caused by El Ni？o is probable over this south-west to north-east zone.As La Ni？a decays,roughly the contrary happens.

关 键 词：气候学 亚洲夏季风 ENSO 中国夏季降水 

分 类 号：P457.6[天文地球—大气科学及气象学]