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中文摘要：
利用江淮地区44个站1954-2003年50a逐日降水资料，采用模糊聚类、经验正交函数分解（EOF）、谐波分析和小波分析等方法分析了江淮梅雨期梅雨量的时空变化特征。结果表明：江淮地区梅雨量的空间分布存在显著不同的区域差异，可以分为南、北两个区。梅雨量具有显著的年际和年代际变化特征，南区候平均雨量峰值出现在6月第5候，北区峰值出现在7月第1候，副高脊线的两次北跳分别与江淮梅雨的平均入梅日期（6月第4候）和平均出梅日期（7月第2候）密切有关；南区梅雨量长期变化呈显著的上升趋势，而北区变化不明显；南北两区梅雨量具有显著不同的年际和年代际方差构成。南北两区梅雨量均存在多时间尺度的振荡周期。副热带高压和季风环流的异常直接影响到江淮梅雨期梅雨量的丰枯。
英文摘要：
Based on the 44 stations daily precipitations over the Changjiang-Huaihe region during the Meiyu period from 1954 to 2003, the regional characters of the precipitation are investigated in terms of fuzzy cluster method , empirical orthogonal function （EOF） decomposition, the harmonic analysis and Morlet wavelet analysis. Results show that the integrated region can be divided into south and north parts according to the result of fuzzy cluster and the spatial distribution of precipitation. The different prominent inter-pentad, inter-annual, inter-decadal variations are discussed by means of harmonic analysis. The long-term evolution in south part tends to develop remarkably but this kind of tendency is not obvious in north part. The peak values of the precipitation appear in the fifth pentad of June in south, but in the first pentad of July in north part ,which seems to be associated to the seasonal motion of subtropical ridge intimately. The abnormities of subtropical ridge and monsoon circumfluence in good Meiyu-years are stronger than that of in poor Meiyu-years that are the main cause giving rise to the precipitation anomaly over the Changjiang-Huaihe region during the Meiyu period.
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