摘要
分析了1961—2009年华中地区降水量、气温及蒸发量变化特征,在此基础上,采用标准化降水蒸散指数(SPEI)确定华中地区的干旱强度,按照SPEI指数的标准界值将干旱强度划分为4个等级并分析了各干旱等级的发生频率和空间分布。不同时间尺度SPEI指数的EOF分析表明:华中地区干旱的主要空间分布具有较好的全区一致性,且春季干旱的强度在四季中是最强的。
Based on the analysis of the variation characteristics of precipitation amount, temperatureand evaporation in central China during 1961-2009, the drought intensity was divided into four gradesaccording to the standardized precipitation evapotranspiration index（ SPEI）. Furthermore, the coveragearea and occurrence frequency at different grades were also analyzed. The experience orthogonal function（EOF） analysis on SPEI at different time scales shows that the main spatial distribution of drought incentral China has synchronism in the whole region, and the most serious drought occurrs in spring.
出处
《气象科学》
北大核心
2015年第5期646-652,共7页
Journal of the Meteorological Sciences
基金
江苏省高校自然科学研究面上项目(13KJB170013)
江苏省高校"青蓝工程"
