陕西省降水量变化的区域特征分析

根据陕西省1951—2000年的降水量资料，采用旋转主因子分析方法，对冬季、夏季和年降水量场进行客观分区。陕西省可划分为3个子区域：陕北区、关中陕南西部区和陕南区。在此基础上，研究了陕西省降水量变化的区域特征和年代际变化以及长期趋势特征。结果表明，陕西省过去50年降水量有显著的北少南多特征，而且陕北区降水量的减少趋势远大于关中陕南西部区，陕南区在夏季和冬季降水量还略有增加。

Analyses on Regional Characters of Rainfall Change in Shaanxi Province

Based on the rainfall data of Shaanxi Province from 1950 to 2000, Using the method of REOF, winter, summer, and yearly precipitation fields can be divided into three subareas, they are the North Shaanxi, Guanzhong and west of South Shaanxi, the South Shaanxi. On the basis of this, the regional feature, the interdecadal change and the long-term trends of precipitation in Shaanxi are analysed. The results show that the rainfall in the past 50 years is scarce in the north, while plenty in the south. The decreasing trend of precipitation in North Shaanxi is more than Guanzhong and west of South Shaanxi, but the rainfall of South Shaanxi in summer and winter have increased slightly.