基于激光雷达扫描观测的散布点污染源监测

摘要

2015年6月11日在河北省石家庄市组织了一次激光雷达水平扫描观测实验,并通过动态阈值法提取了区域散布污染源的位置及传输路径.结果显示,近地面气溶胶空间分布不均匀,强排放点污染源的污染物水平传输距离可达4km.水平扫描观测模式不受地表类型影响,可以获得高空间分辨率的近地面气溶胶空间分布.不同高度角的测试观测表明,应尽量将观测点设置在区域高点并采用水平方式开展扫描.在污染区域提取环节,可利用代表区域本底大气的能见度来确定消光系数动态阈值,增强对于相对污染程度特征的提取效果.%A horizontal scanning Lidar experiment was performed in Shijiazhuang city, Hebei province, on June 11, 2015, and the location and the transportation of regional pollution sources were determined by using dynamic threshold method. The results showed that the aerosols near the ground are uneven distributed and the pollutants from heavy industrial emission sources can transport as far as 4km. The horizontal scanning scenario can obtain high resolution spatial distribution of near surface aerosols, without affecting by the surface types. Observations at different elevation angles indicated that the observation platform should be placed as high as possible and the scanning should be in horizontal manner. During the extraction of pollution area, the background atmosphere visibility could be used to determine the dynamic threshold of the extinction coefficient, thereby enhancing the extraction of regional pollution characteristics.