江淮梅雨期(6-7月)最高气温的区域特征

利用江淮地区64个测站1961-2001年6-7月最高气温资料，采用旋转经验正交展开(REOF)方法对江淮地区梅雨期最高气温场进行客观分区，并分析了各区域最高气温的长期演变趋势。结果表明：江淮地区梅雨期最高气温场可分为3个区域。各区域的最高气温均具有明显的年代际变化特征，且存在着显著差异，其中东南区长期变化趋势不明显，而北方区和西南区显著降低；各区域存在明显不同的年际、年代际方差构成和多尺度振荡周期。

Regional Features of Changjiang-Huaihe Valley's Maximum Temperatures in the Mei-yu Period

Using the June and July maximum temperature data at 64 observational stations from 1961 to 2001,the Changjiang-Huaihe valley's maximum temperature field in the Mei-yu period is divided objectively into 3 subdivisions by using the rotated empirical orthogonal function(REOF) method.Based on this,the long-term trend of each subdivision maximum temperature in the Mei-yu period is analyzed.Results indicate that the maximum temperature fields in 3 subdivisions have distinct interdecadal change character in the recent 41 years,and there is obvious regional difference:the long-term trend of southeast subdivision's maximum temperature is not distinct,but that of north subdivision's and southwest subdivision's is markedly decreasing.The interannual(interdecadal) variance contribution and variation periods in 3 subdivisions exhibit remarkable diversity.