2011年秋季华西秋雨异常及成因分析  

Analysis of Anomalies of Autumn Rain in West China in 2011 and Its Possible Mechanism

作　　者：柳艳菊[1] 孙冷[1] 孙丞虎[1] 王遵娅[1] 王艳姣[1] 袁媛[1] 

机构地区：[1]国家气候中心,北京100081

出　　处：《气象》2012年第4期456-463,共8页Meteorological Monthly

基　　金：973项目(2012CB417205);国家科技支撑计划(2009BAC51B02);国家自然科学基金重点项目(41130960)共同资助

摘　　要：本文对2011年秋季我国的降水异常特征及成因进行了分析,结果表明2011年秋季,华西秋雨较为典型,主要呈现以下3个特点:多雨区位置较常年偏东、偏北,阴雨日数偏多;秋雨阶段性显著;极端性强。2011年华西秋雨异常突出表现为对2011年9月开始的La Nina事件响应的特征。此外,年代际的变化也可能是造成华西秋雨异常的重要原因之一。The characteristics of anomalous precipitation in the autumn of 2011 and its possible mechanism were investigated. The results showed that autumn rain of 2011 in West China was very typical, with the following features, namely the easterly and northerly being more precipitation areas, more overcast or rainy days, prominently concentrated precipitation phases, and strong extremeness. The anomaly of au- tumn rain in West China was featured mainly by a response to the typical La Nina event which started in September 2011. Furthermore, the decadal variation may be one of the important causes for the anomalous autumn rain in West China.

关 键 词：气候异常 华西秋雨 LA NINA 成因分析 

分 类 号：P315.7[天文地球—地震学]