京津冀地区一次浮尘过程的车载激光雷达走航观测

利用双波长三通道激光雷达与车载激光雷达,针对2018年3月28日京津冀区域的浮尘天气过程,分别进行了定点垂直观测与车载走航观测,对这次浮尘天气中沙尘的源地、沙尘气溶胶的时空分布、沙尘的传输路径与传输方式进行了综合分析。位于北京的激光雷达监测到28日凌晨开始,沙尘气溶胶与近地面污染物混合,受沙尘影响近地面污染物浓度迅速升高。北京到沧州的车载激光雷达走航观测结果显示,沙尘气溶胶先向南传输到京津冀南部区域,随后向西南方向传输,同时观测到京津冀区域上空1. 5 km左右存在沙尘传输带。结果表明,使用车载激光雷达走航观测,结合定点垂直激光雷达与其他地面监测数据,能可靠地观测到沙尘过程中颗粒物的时空变化特征。

Analysis of an Air Pollution of Dust Process Using Mobile Lidar over Beijing-Tianjin-Hebei Area

An air pollution of dust process in the Beijing-Tianjin-Hebei region was measured by using ground-based lidar and mobile vehicle lidar on March 28,8. In this paper, the source of dust, the spatial and temporal distribution of dust aerosols and the transmission mode of dust for the pollution process were analyzed. The ground-based lidar in Beijing showed that the mix of the dust and pollutants near the ground lead to a rapid increasing of the pollutant concentration. Distribution of aerosol measured by mobile vehicle lidar from Beijing to Cangzhou showed that the dust aerosols were first transported to the southern part of Beijing, Tianjin and Southern Hebei, and then to the southwest. And a dust transmission belt was observed around 1.5 km above the Beijing-Tianjin-Hebei region. The results showed that the mobile vehicle lidar combining with the ground-based lidar and other ground monitoring data can reveal the spatial and temporal distribution of dust aerosols clearly.