气象与环境学报Issue(6)：81-86,6.DOI:10.3969/j.issn.1673-503X.2013.06.013
1960-2011年洞庭湖区年降水量变化特征
Variation characteristics of annual precipitation from 1960 to 2011 in Dongting Lake area
摘要
Abstract
Based on the precipitation data at 24 weather stations from 1960 to 2011 in Donting Lake area,the annu-al precipitation variation was analyzed by methods of a climatic trend rate,a Mann-Kendall test and a wavelet anal-ysis.Annual SPI(standard precipitation index)was calculated by methods of an EOF(empirical orthogonal func-tion)and a REOF(rotated empirical orthogonal function),and the temporal and spatial distributions of drought and flood were discussed.The results show that the annual precipitation increases from south to north on spatial scale in Dongting Lake area,while its trend is not significant on temporal scale.An abrupt change of annual precipitation appears in 1963.There are 6 years,9 years,and 16-17 years precipitation oscillation cycles in Dongting Lake area. Drought and flood are frequent and extreme weather events are in increasing trends in the study area.The annual precipitation has good consistency on spatial scale,i.e.general drought or flood.But there are also cases in which it is drought in the south and flood in the north and vice verse.There are the south,northwest and middle areas of abnormal climate regions for annual precipitation in Dongting Lake area.关键词
周期变化/突变/旱涝Key words
Oscillation period/Abrupt change/Drought and flood分类
天文与地球科学引用本文复制引用
黄菊梅,邹用昌,彭嘉栋,蔡海朝,覃鸿..1960-2011年洞庭湖区年降水量变化特征[J].气象与环境学报,2013,(6):81-86,6.基金项目
中国气象局气候变化专项（CCSF201205）和湖南省气象局重点课题（201202）共同资助。 （）
