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中文摘要：
利用江淮地区70个测站1961-2001年历年6月第2侯至7月第2侯最低气温资料，采用旋转经验正交展开（REOF）方法对江淮地区梅雨期最低气温场进行客观分区，并分析了各区域最低气温的长期演变趋势。结果表明：江淮地区梅雨期最低气温场可分为3个区域，各区域的最低气温均具有明显的年际、年代际变化特征，且存在着显著差异，其中东北区明显上升，而南方区和西北区呈降低趋势；各区域存在明显不同的年际、年代际方差构成、突变特征和多尺度振荡周期。
英文摘要：
Using minimum temperature data from the second pentad in June to the second pentad in July at 70 observational stations from 1961 to 2001, the Changjiang-Huaihe area＇s minimum temperature field in Meiyu period is divided objectively into 3 regions by rotated empirical orthogonal funetion（REOF） method. Based on this,the long-term trend of each region minimum temperature in Meiyu period is analyzed. Results indicate that the minimum temperature field in 3 regions has distinct characteristics of interdeeadal change in the recent 41 years,and there is obvious area difference： the long-term trend of minimum temperature went up markedly in northeast area,descended in south area and northwest area. The interannual（interdecadal） variance contribution ,catastrophe feature and variation period in 3 regions exhibit remarkable diversity.
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