华北区域大气污染过程中天气型和输送路径分析

以2003年10月2—12日一次大气污染过程为例，分析华北区域大气污染过程中主要天气型及污染物输送路径.结果表明:区域内大部分城市API上升阶段，以西南输送路径为主；API下降阶段，受纬向锋区影响，以东北气流为主，污染物从北向南扩散，区域内各城市空气质量好转.统计2003年9—12月7次大气污染过程发现，当华北地区为大尺度高气压控制时，若高压中心位于山西南部，河北为弱的低气压区(地形槽)时，将导致西南风气流盛行该区域.受地形和天气型控制，西南方向的输送通道是引起北京大气污染过程的主要通道. 

Analysis of Synoptic Patterns and Transports during Regional Atmospheric Pollution Process in North China

To study synoptic patterns and pollutant transports in regional air environmental processes in North China, a pollution process from October 2nd to 12th, 2003 was discussed as an example. Results show that the south-west pathway is dominant in the API increasing phase, while the pollutants disperse from north to south during the API decreasing phase, and the air quality of most cities turns good in the influence of zonal fronts. Statistics of all air environmental processes from september to December were discussed. When large-scale high pressure controls North China, and if the center lies in the south part of Shanxi and Hebei is influenced with low pressure system (weak trough), the synoptic situation results in a south-west air stream over this region. Results show that south-west pathway is the main transport to cause the regional pollution process with the influence of topography and synoptic patterns. 