长江三角洲夏季降水异常及气候成因  

Study on summer anomalies of precipitation and climatic causes in the Yangtze River Delta

作　　者：蒋薇[1] 宋连春[2] 王式功[1] 吕军 

机构地区：[1]兰州大学大气科学学院,兰州730000 [2]中国气象局大气探测技术中心,北京100081 [3]江苏省气侯中心,南京210008

出　　处：《气象科学》2009年第3期355-361,共7页Journal of the Meteorological Sciences

基　　金：国家科技支撑计划项目(2007BAC29B03)

摘　　要：根据长江三角洲地区61个气象站的1961—2007年夏季降水量资料,应用EOF和REOF等统计方法分析了长江三角洲地区夏季降水的时空分布及演变特征,并探讨了夏季降水异常类型的初步成因。结果表明:47a来长江三角洲地区夏季降水有比较明显的年代际变化,1980s开始有明显增加,该地区降水异常可以分为两种类型,分别为一致偏多(少)型和北多(少)南少(多)型,并且通过分析500hPa环流型势、副热带高压和ENSO事件的特征,初步探讨了降水异常的可能成因。Based on summer rainfall data collected from 61stations in the Yangtze River Delta from 1961 to 2007, the spatial-temporal characteristics of summer （from June to August） precipitation are analyzed by applying the methodologies of EOF and REOF. Results indicate that summer precipitation in the Yangtze River Delta has obvious differences during the recent 47 years, and the summer precipitation has dramatic increase since 1980s. The rainfall has two patterns, one is the type with no difference over the Yangtze River Delta and the other type of the rainfall distribution is characterized by the significant difference in the south and north. By analysing the characteristics of the 500hPa height, the subtropical over West Pacific and ENSO, the cause of precipitation anomalies could possibly be explored.

关 键 词：降水异常 气候成因 REOF 

分 类 号：P412[天文地球—大气科学及气象学]