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中文摘要: 利用西北(区)168个测站1961～2000年6～9月月平均降水与温度资料，运用EOF、REOF、小波分析等诊断方法分析了近40年6～9月降水异常特征，同时分析了旱涝变化。结果表明:(1)西北区6～9月降水受大尺度天气系统影响，降水空间异常分为7个气候异常区；(2)各异常区代表站降水的时间演变特征、不同年代所盛行的主要周期均有所差异；(3)渭水流域区、高原区旱涝变化位相基本一致，进入90年代，变干是各区平均气候变化的普遍特征。
中文关键词: 降水，REOF，小波分析，旱涝指数
Abstract:With EOF and ROEF and wavelet analysis,the abnormal characteristics and the evolution rule in Northwest China are studied on the basis of the precipitation and temperature data of June-September for the period 1961-2000 collected from 168 stations. The results show:(1) The abnormal characteristics of precipitation in Northwest China is affected by the same large scale synoptic system,the precipitation abnormal area can be divided into seven regions. (2) The changes with time and periods of precipitation at each station are not the same. (3) The trend changes of drought is same at the first and the third region,the others are not the same.
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基金项目:甘肃省科技攻关计划项目“西北干旱成因及其应用”(CGS012-A45-118)资助
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引用文本：
王宝鉴,黄玉霞,2004.西北地区近40年6～9月降水的异常特征分析[J].气象,30(6):28-31.
,2004.Analysis of Precipitation Characteristics from June to September in Northwest China for Last 40 years[J].Meteor Mon,30(6):28-31.
王宝鉴,黄玉霞,2004.西北地区近40年6～9月降水的异常特征分析[J].气象,30(6):28-31.
,2004.Analysis of Precipitation Characteristics from June to September in Northwest China for Last 40 years[J].Meteor Mon,30(6):28-31.