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江淮梅雨由江南梅雨和淮河梅雨两个部分组成.江南梅雨集中在6月下旬,淮河梅雨出现在7月上中旬.1998年以来,江南梅雨、赤道太平洋的表层和次表层海温异常都经历了重大的年代际调整.进入21世纪以来,江南梅雨量与淮河梅雨量之间出现了完全相反的趋势变化和准两年振荡.1999～2000年的强La Nia之前,海洋增暖在赤道东太平洋.进入21世纪以来,赤道太平洋次表层海温距平信号集中在日界线附近露头,是赤道中太平洋表层海温增暖的早期信号.2003,2005和2007年是淮河流域的多降水年,也是前期冬春赤道中太平洋海温正距平的年份.一个关系表明,冬春赤道东(中)太平洋的增暖事件对应江南地区(淮河流域)梅雨量偏多.
The plum rains of the Yangtze River and the Huaihe River are composed of two parts: the May rain in the Jiangnan River and the Meiyu in the Huaihe River, while the rainy season in the Jiangnan River is concentrated in late June and the rainy season in the Huaihe River occurs in the middle and last July. Since 1998, the surface and subsurface sea temperature anomalies A major interdecadal adjustment.With the advent of the 21st century, there have been completely opposite trends and quasi-two-year oscillations between the Meiyu rainfall in the Jiangnan region and the Meiyu rainfall in the Huaihe River. Prior to the strong La Nia from 1999 to 2000, the warming of the oceans Eastern Pacific Ocean. Since the beginning of the 21st century, the subsurface SST anomalies in the equatorial Pacific have focused on the outcrop near the daily boundary and are early signals of warming of the surface SST over the equatorial Pacific Ocean. In 2003, 2005 and 2007, , Which is also a positive anomaly of the SST anomalies in the previous winter and the middle of the equatorial Pacific.A relationship shows that the warming events in the eastern and middle Pacific equatorial Pacific are corresponding to more rainfall in the southern part of the Huaihe River basin.