灾害学2011，Vol.26Issue(1)：94-98,5.
安徽省近50年干旱时空特征分析
Analysis of the Spatial-temporal Characteristics of Drought in Anhui Province in Recent 50 Years
摘要
Abstract
By using daily precipitation and temperature data from 78 stations of Anhui province during 1961 ～2009, the drought process is calculated by CI index, then the drought days for stations each year are figured out and the spatial-temporal characteristics of drought over Anhui province in recent 50 years is analyzed by trend analysis, EOF, power spectrum analysis, wavelet analysis, moving T-test and so on. The results show that the original and corrected thresholds of CI index which are corrected by the cumulative frequency are basically the same.The distribution of the average drought days during 1971 ～ 2000 is latitudinal and drought frequency descends form north to south. The trend of drought days descends in Huaibei and the east of Jianghuai, and ascends in the other area, but the both have not pass the 0. 05 significance test. The cumulative percent variance of the EOF first three modes reaches 75％, the first mode are plus in all province and the distribution is latitudinal, the zero line transversely makes off north and south pans in the second mode and three parts in the third mode. The main period of drought days is 12 ～ 13 years and the secondary is around 2 ～3 years. In recent 50 years, the drought days experience three circulations on 12 ～ 13 years scale, and the drought days mutate around 1968.关键词
干旱日数/时空特征/干旱指数/安徽省分类
天文与地球科学引用本文复制引用
谢五三,田红..安徽省近50年干旱时空特征分析[J].灾害学,2011,26(1):94-98,5.基金项目
安徽省气象局2009年业务建设类项目"安徽省干旱灾害风险区划研究" （）
