中文摘要：

利用1951～2000年中国东北地区23个台站资料,对东北夏季气温的时空分布进行了研究,发现其变化除具有整体的一致性外,东北南部和北部的夏季气温在年际和年代际时间尺度都表现出很大不同,其中北部区域的夏季气温在1987～1988年间发生了一次显著的气候突变.另外,剔除夏季气温全区一致变化的年份后,南北两区夏季气温与大气环流和海表温度的关系表明：突变前,影响北部和南部冷/热夏季的大气环流形势存在显著的不同,关键海域亦有很大差异：影响南部的为中纬度西太平洋和印度洋部分海域,影响北部的主要为ENSO事件;突变后,两区的夏季气温及相应大气环流和关键海区都趋于一致.在整个分析时段内,北部夏季气温与东亚夏季风存在显著负相关,而南部的关系则不明显.

英文摘要：

Based on the observational data of 23 stations in Northeast China during 1951 - 2000, the temporalspatial distributions of summer air temperature （SAT） are investigated. It is found that the variabilities of SAT are different in the north and south of Northeast China on the interannual and decadal time scales, besides the same variability in the whole region. And the SAT in the north exhibits a significantly abrupt climate change in 1987 - 1988. Except for the years with the same variability, the relationships between the SAT in the two areas and atmospheric general circulation as well as sea surface temperature （SST） are revealed as follows： before the abrupt climate change, the main features of the atmospheric general circulation and SST associated with the two areas＇ SATs are different. The key sea regions which have influence on the SAT in the south area （SA） are the mld-latitude western Pacific and parts of the Indian Ocean. On the other hand, the main factor for the north area （NA） is ENSO events. After the abrupt climate change, the variabilities of the SAT in the two areas and the corresponding atmospheric circulation and SST amomalous patterns become similar. In addition, the NA SAT has a significant correlation with the East Asian summer monsoon （EASM） during 1951 -2000, but the high correlation does not exist in the SA.