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中文摘要：
应用1959--2000年江淮地区76站逐日降水资料，对梅雨期月降水量进行REOF分解。将江淮区分为4个具有不同梅雨期降水空间分布特征的区域，进而分别分析这4个区域梅雨期暴雨以上极端降水的季节、年际和年代际变化特征，以及周期振荡和突变性质。结果表明：4个区暴雨以上极端降水总量和极端降水日数最大值均发生在梅雨期，梅雨期极端降水呈上升趋势，且具有不同的年际和年代际变化特征；江淮西南区梅雨期暴雨总量和暴雨日数在20世纪90年代还存在明显上升突变现象；4个区梅雨期极端降水存在不同时间尺度的周期振荡。
英文摘要：
Based on 1959-2000 daily precipitation data of 76 stations in the Changjiang-Huaihe area of China,the Changjiang-Huaihe area is divided into four regions with different spatial features of rainfall in Mei-yu period by use of REOF decomposition. The interseasonal, interannual and interdecadal variations and the period, trend characteristics of four regions＇extreme precipitation above storm rainfall are examined. Results show that all the four regions＇maximum extreme precipitation are found in the period, their extreme rainfalls in the period show upward trends and have different interannual and interdecadal variations. The storm rainfall in the period and its days of south-west region has a significant upward catastrophe in the 1990＇s. The extreme precipitation of four regions have different periodic variations with kinds of time scales.
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