Monitoring the distributed point pollution sources based on a scanning Lidar
LÜ Yang1,3, LI Zheng-qiang1, XIE Jian-feng2, ZHANG Feng2, LIU Xiao-qiang2, LIU Zhao1,3, XIE Yi-song1, XU Hua1, CHEN Xing-feng1
1. State Environmental Protection Key Laboratory of Satellite Remote Sensing, Institute of Remote Sensing and Digital Earth, Chinese Academy of Sciences, Beijing 100101, China;
2. Hebei Province Environmental Monitoring Center, Shijiazhuang 050000, China;
3. University of Chinese Academy of Sciences, Beijing 100049, China
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.
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