基于激光雷达扫描观测的散布点污染源监测  

Monitoring the distributed point pollution sources based on a scanning Lidar

作　　者：吕阳 李正强 谢剑锋 张丰 刘小强 刘诏 谢一凇 许华 陈兴峰 

机构地区：[1]中国科学院遥感与数字地球研究所国家环境保护卫星遥感重点实验室,北京100101 [2]中国科学院大学,北京100049 [3]河北省环境监测中心站,河北石家庄050000

出　　处：《中国环境科学》2017年第11期4078-4084,共7页China Environmental Science

基　　金：中国科学院科技服务网络计划(STS)区域重点资助项目(KFJ-STS-QYZD-022);国家自然科学基金资助项目(41671367);河北省科技计划资助项目(15273909)

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 4 km. 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.

关 键 词：激光雷达 扫描观测 散布点污染源 动态阈值 

分 类 号：X51[环境科学与工程—环境工程]