东北亚冷夏的年代际变化

通过对1881～2000年东北亚夏季气温的分析,发现东北亚夏季气温有明显的年代际变化,时间尺度为80年左右和30年左右;120年来东北亚共发生27次冷夏(平均气温距平≤-0.5°C),其中6次为严重冷夏(平均气温距平≤-1.0°C).通过对海平面气压场、对流层中层500 hPa高度场及海温场的分析,研究了东北亚冷夏的环流机制以及与SST异常的关系,指出东北亚夏季气温的年代际变化与大尺度环流特征及海温的变化关系密切.

Inter Decadal Variability of Cool Summer of Northeastern Asia

Obvious inter decadal variability of summer temperature over northeastern Asia has been found through the analysis of summer temperature over Northeastern Asia. The time scale is about 80 years and 30 years. There are 27 cool summers in 120 years period, and the 6 of 27 cool summers are serious cool summers. The relationship between the circulation mechanism of cool summer and SST has been studied by analysis on SLP, 500 hPa geopotential height and SST. It is pointed out that the inter decadal variability of the summer temperature over northeastern Asia has close relationship with the large-scale circulation and the SST.