摘要
采用1948—2019年NCEP/NCAR再分析资料分析了东北亚地区在年际尺度上的冬季气温年际变化特征、大气环流和海温因子。结果表明:在年际时间尺度上,东北亚冬季气温具有一致型变化特征和东北—西南反相的变化特征。东北亚冬季气温一致型变化主要是北极涛动通过东亚大槽来影响的,北极涛动增强(减弱),环流的经向性减弱(加强),东亚大槽减弱(加强),偏北气流也随之削弱(加强),导致冬季气温一致升高(降低)。与气温东北—西南反相型变化有显著联系的因子是厄尔尼诺,厄尔尼诺主要是通过影响太平洋西部型的强度对东北亚冬季气温产生影响。当发生厄尔尼诺(拉尼娜)时,太平洋西部型处于正(负)位相,中纬度地区西风气流增强(减弱),环流的经向性减弱(增强),东亚冬季风减弱(增强),东北亚的西南地区偏暖(冷);而东北亚的东北地区受到西风(东风)异常的影响,气温偏冷(暖)。
The interannual variation of winter temperature on the interannual scale in Northeast Asia and its possible atmospheric circulation and sea temperature factors were analyzed using NCEP/NCAR reanalysis data from 1948 to 2019.The results show that on the interannual time scale,the winter temperature in Northeast Asia had a consistent change characteristic and a northeast-southwest reverse phase change.The consistent pattern of winter temperature change in Northeast Asia was mainly influenced by the Arctic Oscillation through the East Asian trough.When the Arctic Oscillation strengthens(weakens),the meridional nature of the circulation weakens(strengthens),and the East Asian trough weakens(strengthens),then the northerly airflow weakens(strengthens),resulting in the consistent increase(decrease)of winter temperature.The factor significantly associated with the northeast-southwest inversion pattern was El Niño,which mainly affects the winter temperature in Northeast Asia by affecting the intensity of the Western Pacific pattern.When El Niño(La Niña)occurs,the Western Pacific pattern was in the positive(negative)phase,and the westerly airflow in the mid-latitude region strengthens(weakens).Meanwhile,the meridional circulation weakens(strengthens),and the East Asian winter monsoon weakens(strengthens),then the southwest of Northeast Asia is warmer(colder).The northeast of Northeast Asia was affected by the west wind(east wind)anomaly,and the northeast of Northeast Asia was colder(warmer).
作者
宋晓雪
Song Xiao-xue(Dalian Air Traffic Management Station of China Civil Aviation,Dalian,Liaoning 116033)
出处
《农业灾害研究》
2023年第2期93-95,共3页
Journal of Agricultural Catastrophology
关键词
年际变化
冬季气温
东北亚
Interannual Variation
Winter Temperature
Northeast area
