Spatial/Temporal Variations of summer Temperature in Northeast China in recent 50 years

The monthly mean temperature data at 160 stations in China during 1951-2000 are used,and among which 20 stations are selected as representative stations of Northeast China.On the basis of the analysis of seasonal and interannual variations,the interannual and interdecadal variations of summer temperature in Northeast China are emphatically studied in this paper.It is found that summer temperature in Northeast China is slightly warmer before 1956,is the lowest in 1956-1970's,slowly began to rise in 1980's,got much warmer in 1990's.The warming trend is obvious in the recent 50 years,with a warming rate of 0.235°С/10a.The summer temperature anomaly shows the threeyear,fouryear,sevenyear and sixteenyear periodic variations in Northeast China.The warming trend is similar with that in North China,but it is opposite to that in areas south of the Huanghe River.The rising of summer temperature in Northeast China is one of the most prominent in China.