京津冀地区一次污染过程的星载地基激光雷达联合观测分析

针对2018年3月9—15日京津冀地区的一次空气重污染过程,进行了基于地基颗粒物激光雷达组网的星载-地基联合观测分析。颗粒物激光雷达观测到污染前期为局地污染累积过程,中期有明显的污染物区域传输过程,北京受太行山沿线城市污染输送影响较大。风廓线激光雷达观测结果表明:此次污染过程近地面主要为偏南风且风力较弱,冷空气到来时风向转为较强东北风,导致污染消散。微波辐射计观测到保定在污染过程中出现持续6 d的逆温层,同时在污染过程中近地面相对湿度较高,逆温层被打破后污染开始消散。在污染过程的各个阶段中,污染团的空间分布与变化特征均被很好地反映出来,可见地天联合观测对污染物的累积与输送研究有较大的意义,能对京津冀及周边地区的大气污染联防联控提供有力支持。

Joint Observation of a Haze Episode in Beijing-Tianjin-Hebei Region with Spaceborne and Ground-based Lidar

This paper analyzes a heavy pollution process in the Beijing-Tianjin-Hebei region from March 9th to March 15th,2018,which is based on analysis of combination of spaceborne and ground observation of ground particle lidar network. The lidar find that the local pollutant accumulated at earlier pollution process, and the pollution transportation from other area play the main part in the mid-term. The observation by wind lidar find the small southerly wind is dominated in pollution process, and the wind shift to strong north wind while the cold air move southward, cause the dissipating of pollution. An inversion layer lasting for 6 days on Baoding is found by microwave radiometer, and the observations of it find the humidity of Baoding is in a high level during the pollution process, in the end of pollution process the inversion layer disappeared with the dissipating of pollution.Throughout the pollution process, we can clearly observe the spatial distribution and changing characteristics of pollution air mass. It can be seen that the combined observation of space borne and ground is of great significance to the study of the transport of pollutants that can provide strong support for joint prevention and control of air pollution in Beijing-Tianjin-Hebei and surrounding areas.