摘要
利用西北 (区 ) 1 6 8个测站 1 96 1～ 2 0 0 0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 4 0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 。
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.
出处
《气象》
CSCD
北大核心
2004年第6期28-31,共4页
Meteorological Monthly
基金
甘肃省科技攻关计划项目"西北干旱成因及其应用"(CGS0 1 2 A4 5 1 1 8)资助
关键词
降水异常
温度
小波分析
EOF
REOF
西北地区
precipitation rotated principal component analysis numerical experiment wavelet analysis drought/flood index
