泰兴市2021年春季典型沙尘污染过程的时空分布解析

Spatial and temporal distribution of typical dust pollution process in Taixing City in spring 2021

利用当地空气质量自动监测站颗粒物监测数据和气象数据,并结合大气颗粒物监测激光雷达的监测数据以及HYSPLIT气团后向轨迹模型等,对泰兴市2021年春季较为典型的沙尘污染过程进行综合分析。结果表明:1)沙尘开始阶段,PM_(10)浓度升幅明显,污染较为严重时,PM_(2.5)/PM_(10)降至0.2左右;2)在沙尘影响期间,泰兴市颗粒物浓度呈现双峰特征,但两个时间段出现次峰值的原因不同,3月30日晚间出现次峰值与沙尘沉降有关,而5月8日上午出现次峰值与天气系统导致的沙尘回流有关;3)结合激光雷达反演结果可以看出,两次沙尘污染过程中,沙尘传输高度普遍在2 km以下,厚度大于1 km;4)泰兴市沙尘传输主要为西北和偏北路径,潜在污染源以内蒙古、安徽、河南、河北、湖北等省份的输入性污染为主。对泰州市春季沙尘污染的时空分布以及演变过程的了解,为该地春季颗粒物污染的改善提供了一定的科学依据。

The typical dust pollution process in Taixing City,Jiangsu,China,in the spring 2021 was comprehensively analyzed using the monitoring data of particulate matter from local air quality automatic monitoring station and atmospheric particulate matter monitoring lidar,as well as the meteorological data,and HYSPLIT air mass backward trajectory model.The results show that:1)At the initial stage of dust pollution,the concentration of PM_(10)increases significantly,and when the pollution is serious,PM_(2.5)/PM_(10)decreases to about 0.2.2)During the influence period of dust pollution,the concentration of particulate matter in Taixing City shows a bimodal distribution,while the reasons for the secondary peak of the two dust polluion events are different,with the secondary peak in the evening of March 30 being related to dust deposition,and that in the morning of May 8 being related to dust backflow caused by the weather system.3)Combined with the lidar inversion results,it can be seen that in the two dust pollution processes,the dust transport height is generally below 2 km,and the thickness is greater than 1 km;4)According to air mass backward trajectory analysis,dust transport in Taixing City is mainly from northwest and north,and the potential pollution sources are mainly the imported pollution from Inner Mongolia,Anhui,Henan,Hebei and Hubei.By understanding the spatial and temporal distribution and evolution process of spring dust pollution in Taizhou City,it provides a certain scientific basis for improving the situation of spring particulate matter pollution in the area.