基于EOF的福建省降水量时空变化特征分析  

Analyzing Spatial and Temporal Distributions of Precipitation in Fujian Province Using Empirical Orthogonal Function

作　　者：赵嘉阳 王文辉[2] 靳全锋 田超[2] 杨淑妍 林玉蕊[1] ZHAO Jia-yang WANG Wen-hui JIN Quan-feng TIAN Chao YANG Shu-yan LIN Yu-ru(College of Computer and Information Science Forestry College, Fujian Agriculture and Forestry University, Fuzhou 350002, China)

机构地区：[1]福建农林大学计算机与信息学院,福州350002 [2]福建农林大学林学院,福州350002

出　　处：《重庆理工大学学报（自然科学）》2017年第2期73-79,共7页Journal of Chongqing University of Technology：Natural Science

基　　金：全国统计科学研究项目"基于遥感抽样框优化技术的福建山地丘陵区农作物种植面积调查研究"(2015LZ18)

摘　　要：应用EOF(经验正交函数)法对福建省1960—2013年期间28个气象站的降水数据进行时空分布特征分析。研究结果显示:福建省降水场主要有两种典型模态,即全局型和西北-东南型,累积贡献率达74.37%。两种模态的特征向量值均呈西北大、东南小,且模态1时间系数呈向上趋势,模态2时间系数呈向下趋势,说明全省年降水量54年来有增加趋势。闽西北地区虽然降水量多,但变化量大,有减少趋势,闽东南地区虽然降水量少,但变化量小,有增加趋势。福建省降水场是由两种典型模态决定的4种表现类型即全年全省多雨出现14年,全年全省少雨出现19年,闽西北地区多雨东南地区少雨出现7年,闽西北地区少雨东南地区多雨出现4年。Using EOF（empirical orthogonal function） method,we analyzed the spatial and temporal distribution characteristics of precipitation data of 28 meteorological stations in Fujian province during1960—2013.The results show that the spatial distribution of precipitation in Fujian province has two typical modes： the whole region,northwest-southeast,with the first two EOFs reflecting the threetypical vector distribution fields and explaining 74.37% of total variation.In general,the values of the two feature vector distribution fields increased from southeast to northwest.And the time coefficient of modal 1 trend is increased,and the time coefficient of modal 2 trend is decreased,indicating that the trend of annual precipitation of the whole province is increased,and a wetter northwest with a larger annual precipitation variation,there is an decreasing trend.And a drier southeast with a smaller annual precipitation variation,there is an increasing trend in the Southeast Fujian.Fujian province precipitation field has four types determined by two typical modes and number for the year that is wetter in the whole province appeared for 14 years,the drier in the whole province appeared for 19 years,and the wetter in northwest and drier in southeast appeared for 7 years,and the drier in northwest and wetter in southeast appeared for 4 years.

关 键 词：福建省 降水量 经验正交函数 时空分布 

分 类 号：P426.61[天文地球—大气科学及气象学]