中山大学学报（自然科学版）Issue(5)：153-160,168,9.
基于旋转经验正交函数法的广东省干湿状况时空特征分析*
REOF-Based Spatiotemporal Variation of Dryness/Wetness Conditions over Guangdong Province
摘要
Abstract
The monthly dryness/wetness conditions were calculated by applying the Standardized Precipi-tation index (SPI)at the 6 month scale based on the daily precipitation records of 25 meteorological sta-tions in Guangdong Province from 1960 to 2011.The methods including Mann-Kendall trend test,Rota-ted Empirical Orthogonal Function (REOF)and wavelet analysis were employed to detect the spatial and temporal patterns of dryness/wetness conditions over Guangdong Province.The results indicate:decrea-sing trends of SPI are identified mainly in January,February and March,while increasing trends are dominantly concentrated in July,August and September.In the middle part of the study area,the num-ber of months with increasing trends is more than in eastern and western parts.In addition,the eastern and coastal regions of Guangdong are characterized by increasing trends (wet tendency)of SPI in the rainy season (April to September),and the majority portion of Guangdong shows decreasing trends (dry tendency)of SPI in winter.According to the results of REOF,there are four main anomaly sub modes in Guangdong,i.e.,the Nanling,Leizhou Peninsula,the East and West Guangdong.All corresponding ro-tated principal components (RPC)of REOF indicate a wet-dry tendency in the rainy season,and all of them show a dry tendency in winter except the West Guangdong sub mode.1.5-year and 2 to 3-year peri-ods (significant atα=0.05 confidence level)can be investigated in all sub modes with the help of wave-let analysis.关键词
标准化降水指数/Mann-Kendall趋势检验/旋转经验正交函数法/小波分析/广东省Key words
SPI/Mann-Kendall trend test/REOF/wavelet analysis/Guangdong Province分类
天文与地球科学引用本文复制引用
刘智勇,周平,彭资,甘先华,郭乐东,赖仁审..基于旋转经验正交函数法的广东省干湿状况时空特征分析*[J].中山大学学报（自然科学版）,2013,(5):153-160,168,9.基金项目
国家林业局公益性行业专项（201104005，201204104），国家林业局948引进项目（2011-4-76）基金联合资助项目 （）
