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西北地区东部秋季降水日数时空特征分析
引用本文:白虎志.西北地区东部秋季降水日数时空特征分析[J].气象科技,2006,34(1):47-51.
作者姓名:白虎志
作者单位:甘肃省气象局兰州中心气象台,兰州,730020
基金项目:甘肃省科技厅“祁连山空中云水资源开发利用研究”(编号:2004BA901A16)资助
摘    要:利用西北地区东部(95°~112°E,32°~41°N)共104个测站的1960~2000年秋季(9~11月)降水日数资料,通过主成分分析和旋转主成分分析等方法,对我国西北地区东部秋季降水日数异常的时空特征进行了研究。结果表明:西北地区东部秋季0.1 mm以上的降水日数多年平均分布总体上从南向北减少,并存在两个多雨日中心,一个位于祁连山地区;另一个位于青海南部和四川北部地区。其异常分布主要表现为一致性异常和西北与东南相反的异常两种形式,降水日数气候区可主要划分为西北东部副热带季风区、青海东北及甘肃中部区、甘肃河西及河套地区、青海高原南部及川西高原区。各气候区代表站降水日数年代际变化均呈现下降趋势,1978年前后是秋季降水日数由多变少的转折点。

关 键 词:秋季降水日数  时空特征  EOF分解
修稿时间:2004年9月30日

Temporal-Spatial Characteristics of Autumn Precipitation Days in Eastern Northwest China
Bai Huzhi.Temporal-Spatial Characteristics of Autumn Precipitation Days in Eastern Northwest China[J].Meteorological Science and Technology,2006,34(1):47-51.
Authors:Bai Huzhi
Abstract:Using the data of the number of autumn precipitation days from 104 stations in the eastern Northwest China from 1960 to 2000,by means of principal component and rotated principal component analysis methods,the abnormal temporal-spatial characteristics of autumn precipitation days are analyzed.The results show that the number of autumn precipitation days(above 0.1 mm) decreases from south to north,and there are two more-than-normal precipitation centers: one in the Qilian Mountain region and the other over the southern Qinghai Province and the northern Sichuan Province.Its abnormal distribution has two patterns: consistent(abnor-)(mity) and northwest-southeast reverse abnormity.The climate region can be divided into several sections: the east sub-tropic monsoon zone,northeast Qinghai and central Gansu,Hexi and Hetao of Gansu,southern Qinghai Plateau and western Sichuan Plateau.The inter-annual changes of the number of precipitation days at representative stations show a decreasing trend,and the year of 1978 is the turning point.
Keywords:number of autumn precipitation days  temporal-spatial characteristics  EOF decomposition
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