欧亚波列与京津冀雾霾的关系及形成机制

The Mechanism of Haze over the Beijing-Tianjin-Hebei Region and Its Relationship with Eurasian Wave Trains

摘要: 利用NCEP/NCAR再分析资料和京津冀雾霾资料，采用聚类分析等统计方法对京津冀雾霾异常年环流场进行了分类，发现导致1月京津冀雾霾异常的欧亚大陆500 hPa环流场主要是两个模态的波列分布，方差贡献为0.9。重点讨论了两个模态欧亚波列分布及对应京津冀雾霾异常的形成机制，表明极地近地面层的温度特征决定了中高纬度大气的环流特征。当极区气温偏低时，极涡偏强，欧亚大陆形成东-西向“正、负、正”距平波列，京津冀雾霾天气偏多；反之，则偏少。当格陵兰海到巴伦支海区域气温偏高时，欧亚大陆为西北—东南向“正、负、正”距平波列，京津冀雾霾天气偏多；反之，则偏少。

Abstract: Based on the NCEP/NCAR Reanalysis data and the haze data of Beijing-Tianjin-Hebei (BTH) re-gion, the circulation of haze abnormal years over the Beijing-Tianjin-Hebei region is classified by cluster analysis and other statistical methods. The results show that two mainly modes of wave trains distribution over Eurasia at 500 hPa circulation field will result in haze abnormal of Beijing-Tianjin-Hebei region in January. Their variance contribution reaches 0.9. This study fo-cuses on two modes of Eurasian wave trains distribution and the formation mechanism of haze over the Beijing-Tianjin-Hebei region; it shows that the characteristics of the polar atmospheric surface layer temperature determine that of the mid-high latitude atmosphere circulation. When the polar surface layer temperature is on the low side, the polar vortex is strong, there will be a “+ − +” anomaly distribution from west to east over the Eurasian continent, the haze weather over the Beijing-Tianjin-Hebei region will be more, and vice versa; When the temperature from the Greenland Sea to the Barents Sea region is on the high side, there will be a “+ − +” anomaly distribution from northwest to southeast over the Eurasian continent, the haze weather over the Beijing-Tianjin-Hebei region will be more, and vice versa.