温州市PM 2.5输送轨迹特征和潜在污染源区分析

利用HYSPLIT模式和全球再分析资料模拟2012~2014年温州市大气输送的后向轨迹. 结合聚类分析方法、潜在源贡献因子分析法、浓度权重轨迹分析法得到分季节的温州大气输送轨迹、污染潜在源区以及潜在源区污染浓度. 温州地区春、秋、冬季节容易受西北、偏北、西南等内陆气流影响，来自偏北、西南方向的短轨迹由于移动缓慢、扩散能力差，PM 2.5的浓度值高；夏季主要受较为清洁的海洋性气流影响，PM 2.5的浓度值低. 影响温州的潜在污染源区主要集中在3块区域：西北及中原地区、华北地区和江西 福建 浙江周边区域. 其中西北、华北平原地区污染贡献最大，输送轨迹经过这一区域的大气浓度最高. 

Analysis on PM2.5 transport trajectories and potential pollution source for Wenzhou area

Using the HYSPLIT model and NCEP reanalysis data, the backward air flow trajectories arriving in Wen Zhou are calculated .According to the cluster analysis, PSCF (potential source contribution function) and CWT (concentration weighted trajectory method),the trajectories,potential source areas and pollution concentration of potential source areas are obtained. The results show that air flow from northwest, north and southwest influence Wenzhou in spring, autumn and winter. The short trajectories from north and southwest cause the high PM 2.5 concentration in Wenzhou because of the slow moving speed and poor diffusion ability. In summer, air flow from the ocean cause the low PM 2.5 concentration in Wenzhou. Potential sources of Wenzhou focus in these three areas: northwest and central plains China, North China， Jiangxi Fujian and Zhejiang areas. Among them, the highest concentration trajectories are by way of northwest and north China.