中国东部531 a夏季旱涝型的划分  

Classification of 531-Year Drought/Flood Type in Eastern China

作　　者：刘向文[1] 孙照渤[1] 倪东鸿[1] 曾刚[1] 

机构地区：[1]南京信息工程大学江苏省气象灾害重点实验室,江苏南京210044

出　　处：《南京气象学院学报》2008年第5期679-686,共8页Journal of Nanjing Institute of Meteorology

基　　金：国家自然科学基金资助项目(40775059);江苏省高校自然科学基础研究面上项目(07KJB170067);国家自然科学基金重点资助项目(40331010)

摘　　要：选取中国东部38站531 a(1470—2000年)旱涝等级资料,利用EOF展开得到3种基本旱涝型:黄河、长江流域一致型(Ⅰ型),黄河、长江流域相反型(Ⅱ型),黄河、江淮、华南旱涝相间型(Ⅲ型),进而根据各型正负位相给出了6种主要旱涝型的定义。鉴于单个指标存在难以准确刻画旱涝分布的局限性,采用3种指标相结合的方法,依据最突出特征原则对逐年旱涝分布进行定型,从而得到了新的中国东部夏季旱涝型年表。将6种中国东部夏季旱涝型的年代频次变化与EOF分析的时间系数进行比较,二者变化的一致性在一定程度上验证分型结果基本合理。Based on 531-yr（1470-2000） drought/flood level data of 38 stations in eastern China, the EOF analysis is used to achieve three primary drought/flood types：Huanghe-Changjiang homogeneous anomaly pattern（Pattern Ⅰ ）, Huanghe-Changjiang contrary anomaly pattern（Pattern Ⅱ ）, and Huanghe-Jianghuai-South China alternate anomaly pattern（ Pattern Ⅲ ）. Then six summer drought/flood patterns in eastern China are defined according to the positive and negative phases of above three patterns. In view of the instance that a single index can not depict the drought/flood anomaly distribution accurately, this paper utilizes combined three-index to compartmentalize annual drought/flood pattern in term of the most noticeable feature, and then presents a new table of 531-yr summer drought/flood pattern in eastern China. Finally, a comparison is made between the decadal frequencies of six drought/ flood patterns and the EOF time coefficients, showing that they have preferably coherence, which verifies that, to a certain extent,compartmentalization is reasonable on the whole.

关 键 词：中国东部 夏季旱涝型 年代频次 

分 类 号：P429[天文地球—大气科学及气象学]