PML系统性能测定及卷云偏振探测结果分析

偏振-米散射激光雷达(PML)是532 nm单波长激光雷达，可对气溶胶的消光特性及偏振特性进行定量探测.对PML探测性能从三方面进行验证:①对PML主要性能参数的测试结果表明，该系统性能可靠；②对比PML和拉曼-米散射激光雷达(RML)对气溶胶的测试结果发现，二者基本一致；③用激光雷达和太阳辐射计对同一大气光学厚度对比探测可知，二者探测值基本一致.用PML对2005年2─5月合肥地区卷云退偏振比的观测结果表明:合肥地区位于7～12 km高度区域的卷云退偏振比为0.25～0.50，其平均值为0.35±0.07. 

Ensuring Performance Parameters of PML and Analysis of Polarization Lidar Detecting Results of Cirrus Clouds

A polarization-mie lidar (PML) with 532 nm single wavelength able to quantitatively measure extinction and polarization characteristic of aerosol was described. There were three way to validate measurement performance of PML: First, several main performance parameters of PML were determined, which indicates that performance of the system is reliable; Second, the measurement results of aerosol by PML and RML were compared, and they show good agreement; Finally, a good agreement between lidar measurements and solar radiometer measurements was gained in detecting aerosol optical depth. The validation results show that PML is steady and its measurements are reliable. The detected results of depolarizationratio for cirrus clouds over Hefei from February to May, 2005 were also presented and discussed. The cirrus clouds were generally found to be located at 7～12 km altitude and their depolarization ratio varied from 0.25 to 0.50 with average 0.35±0.07.