宁夏年季降水的时空分布特征及变化分析

Analysis on Temporal and Spatial Characteristic and Variation of Precipitation in Ningxia Hui Autonomous Region

针对地处西北内陆的宁夏全境19个气象观测站的年、季降水资料,利用EOF分解方法进行了时空分解,分析了其年、季降水的EOF1和EOF2空间分布特征和时间系数变化趋势,并利用谱分析方法和M-K方法对年降水资料的EOF1和EOF2时间序列进行了周期分析和突变分析,得出了其主要变化周期和突变时间点。

Based on seasonal and annual observed precipitation data at 19 meteorological stations in Ningxia Hui Autonomous Region,the temporal and spatial distribution characteristic is analyzed by EOF method.And spatial characteristics and temporal changes trends of EOF1 and EOF2 of seasonal and annual precipitation have been discassed.The main period and sudden changes point of EOF1 and EOF2 of annual precipitation have been studied by Mann-Kendall and spectrum analysis method.