华北地区天气型对区域大气污染的影响

分析了2000-2001年采暖期重污染天气型演变、垂直温湿层结结构及区域污染特征。区域性重污染背景为各类重污染天气型相继影响的复合系统，其中有各类天气型组成的污染物传输、汇聚和区域污染同步累积系统。华北平原区域性同步污染现象受制于高空持续稳定的西风及低空各类稳定的天气型配置。各地同一时期污染指数的差异与排放源群结构及输送汇聚天气型移动和演变影响有关。区域性重污染温湿层结多为喇叭口状(沙尘型污染除外)。

The Effects of Synoptic Type on Regional Atmospheric Contamination in North China

The evolution of synoptic types of serious contamination,the structure of vertical stratification of temperature and humidity,and the character of regional atmospheric contamination in the heating period of 2000 to 2001 were analyzed.The serious regional contamination is under the background of complex systems in which various synoptic types of serious contamination affect each other,including the systems of contaminant transport,convergence and synchronic accumulation under various synoptic types.The phenomenon of regional synchronic contamination in North China plain is restricted by persistently steady zephyr at high altitude and various steady synoptic types at low altitude.The difference of pollutant index in different regions at the same time is related to the structure of emission source groups and the motion and evolution of synoptic types of transoprt and convergence.The temperature and humidity stratification of serious regional contamination is mostly of bell-mouthed shape(except for sand dust contamination).