经验正交函数与地统计相结合分析降水时空变异  

Using Expansion of Empirical Orthogonal Function and Geostatistics to Analyze Temporal-spatial Variability of Precipitation

作　　者：魏义长[1] 王纪军[2] 张芳[1] 雷红军[1] 徐建新[1] 

机构地区：[1]华北水利水电学院,郑州450011 [2]河南省气候中心,郑州450003

出　　处：《灌溉排水学报》2010年第4期105-109,共5页Journal of Irrigation and Drainage

基　　金：河南省气象科学技术研究项目(Z200709);华北水利水电学院高层次人才引进项目(200723);“十一五”国家科技支撑计划重大项目(2006BAD11B05)

摘　　要：把经验正交函数展开和地统计分析有机结合,以河南省近51年雨季降水为例,进行降水时空变异特征研究。结果表明,用经验正交函数把降水变量场的主要空间分布结构分离出来,可正确地提取时间函数向量;再运用地统计分析对河南省多年雨季降水空间函数特征向量进行空间变异结构分析与插值,得出了河南省雨季降水量空间分布的主要4种类型：总体一致型、南北差异型、东西差异型和豫西山区异常型;然后对时间函数进行分析,得到了对应空间分布型的年际变化趋势规律。Taking the precipitation over Henan province during the last 51 years as example,applying the methods of expansion of empirical-orthogonal function combining with geostatistics,this study analyzed spatial-temporal variability of precipitation based on Excel pivot table and ArcGIS Geostatisitcal analyst.The results show that isolating the spatial distribution of precipitation variable structure,with the method of the empirical-orthogonal functions decomposition of matrix function programmed by Excel VBA,we can rightly separate time function vector.With the method of space mutation structure analyzing and interpolating,applying geostatistics to multiyear precipitation space function eigenvectors in rain seasons,we got the four major types of distribution amount of precipitation in rain seasons in Henan province： the overall-coherent type,the north-south different type,the east-west different type and the Western-Henan-mountain abnormal type.Analyzing the time function,we got the law of inter-annual variability trend corresponding to the spatial distribution pattern.

关 键 词：经验正交函数分解 地统计 降水 时空变异 

分 类 号：P468.024[天文地球—大气科学及气象学] TP317.3[自动化与计算机技术—计算机软件与理论]