中文摘要：

对1961—2002年东北夏季气温用REOF方法分解，以此将东北夏季气温的变化区域分为南部、北部、中东部。讨论三个区域夏季气温的变化趋势及年代际变化特点，结果发现三个区域夏季气温年际变化表现为一致的上升趋势，只是升温的幅度有所不同，而年代际变化差异明显，主要体现在各区域回暖具有一定的先后顺序。功率谱分析的结果表明，各分区的周期变化有明显的差异。对全区以及各分区作滑动均方差，发现各分区气温的年际变化幅度存在差异，北部和中东部气温振荡幅度较为一致，南部地区在1990s之前气温的年际变化较小，1990s之后气温的振荡幅度明显增大。

英文摘要：

Using the rotated empirical orthogonal function （REOF） method, summer temperature over northeast China during the period from 1962 to 2002 is divided objectively into the south, north and east-center regions. Based on this finding, decadal and interannual variations of summer temperature over each region are analyzed. Studies reveal that summer temperatures over the three subregions tend to increase, though the increasing degrees in each subregion are not the same. There are obvious differences in decadal variability that the abrupt time of the three regions are not similar. The periods of temperature in the three subregions are also different by power spectrum. The moving standard deviations of summer temperature show that the amplitude of temperature over three subregions are different, but in the north area and the east-center regions they are similar, while the temperature in south region changes with relative stable amplitude before 1990, and its amplitude increases evidently since 1990.