一次重污染天气过程的监测分析

Monitoring and Analysis of a Heavy Pollution Weather Process

利用地面气象观测和激光雷达监测资料,对聊城市2018年11月21—22日一次持续重污染天气过程中天气形势、气象条件和污染物浓度的变化特征进行了分析。结果表明,该次重污染过程发生近地面受弱气压场控制,大气层结相对稳定,不利于污染物扩散,污染物累积速度快、污染物浓度峰值高,有明显的日变化。聊城上空单站点激光雷达图与相应时段能见度变化相符合,可以区分雾与霾的出现时段,21日入夜后,聊城由霾转雾。

Based on ground meteorological observation and lidar monitoring data,the change characteristics of weather situation,meteorological conditions and pollutant concentration during a continuous heavy pollution weather in Liaocheng City from November 21 to 22,2018 were analyzed.The results show that the heavy pollution process was controlled by the weak pressure field near the ground,the atmospheric structure was relatively stable,which is not conducive to the diffusion of pollutants,the pollutant accumulation speed is fast,the pollutant concentration peak was high,and there are obvious daily changes.The lidar map of a single station over Liaocheng was consistent with the change of visibility in the corresponding period,which can distinguish the occurrence period of fog and haze.After nightfall on the 21st,Liaocheng changed from haze to fog.