激光雷达组网在沈阳地区大气污染监测中的应用研究

Research on the Application of Lidar Networking in Atmospheric Pollution Monitoring in Shenyang City

基于激光雷达组网监测数据,分析沈阳地区垂直方向扩散条件变化特征,研究了沈阳市大气污染演变规律。结果表明:12月份垂直方向扩散条件相对最差,4月份相对较好,7月份受频繁降水影响,边界层高度(PBL)较低;从空间分布看,超级站点位在一年的大多数月份垂直扩散相对较好。在中度及以上污染天,雷达组网中各点位垂直方向扩散条件整体相差不大,PBL主要集中在400~800 m,12月份出现的中度及以上污染天PBL相对最低,仅200~400 m左右;4月份出现的中度及以上污染天由于受沙尘过程影响,各点位PBL差距较大。通过雷达组网对典型颗粒物污染过程的分析发现,以本地积累为主的污染中,扩散条件对污染物的清除及累积起到较为重要的影响;以区域传输为主的污染中,即使垂直方向扩散条件较好,但受上风向污染传输或高空沉降的影响,空气质量仍未出现明显好转。

Based on the lidar network monitoring data in Shenyang City,the temporal and spatial variation characteristics of boundary layer were analyzed,and the evolution rule of air pollution was studied.The results showed that the vertical diffusion condition was worst in December,and the PBL was low in July due to frequent precipitation.In terms of spatial distribution,the vertical diffusion of Supersite was relatively good.In the days of AQI≥150,PBL at all points in the radar network had little difference,mainly concentrated in 400~800 m,while in December was the lowest,only 200~400 m;due to the influence of dust process,PBL in April had a large difference at different points.Through the analysis of the pollution process of typical particulate matter pollution by radar networking,it is found that pollution mainly accumulated in the local area.The diffusion conditions have a more important impact on the removal and accumulation of pollutants;The diffusion conditions are good,but due to the influence of the transmission of the upper winding or high altitude,the air quality has not improved significantly.