双扫描激光雷达精细探测低层大气气溶胶方法

为实现水平非均匀分布的低层大气气溶胶光学特性的遥感探测,提出一种基于双扫描激光雷达的气溶胶精细探测方法.该方法以扫描激光雷达为遥感探测工具,通过双激光雷达相向交叉扫描工作模式,实现对同一空域近地表气溶胶全视野剖面的交叉探测,从而提供双激光雷达方程组以精确求解气溶胶消光和后向散射系数.在数据反演过程中,通过对交叉扫描区域进行坐标化和网格化处理、网格像素单元的初值预设,以及双扫描激光雷达方程组的数值逼近反演得到气溶胶消光.利用长距离扫描激光雷达的数据对该方法进行验证,结果表明,该方法与多角度方法反演所得到的结果随高度变化的趋势具有高度的一致性;同时双扫描激光雷达可提供交叉扫描区域剖面的气溶胶浓度分布,相比于单条廓线具有较大的优势.

Fine Detection of Aerosol in the Lower Troposphere using Twin Scanning Lidars

In order to remote sense the aerosol optical properties in the horizontal inhomogeneous atmosphere,a method based on twin scanning lidars was proposed for fine detection of aerosols.The scanning lidar was utilized to be the remote sensing tool to overcome the effect of overlap function of lidar system.The twin scanning lidars were performed for the cross scanning from the ground to the height of concern,which made the exact solutions of the two unknown parameters (extinction and backscatter coefficients) in the lidar equation retrievable.In the procedures of data retrieval,the coordinate and gridding were performed in the cross region,and the initial values of the pixel data were set.Numerical approximations of aerosol extinction and backscatter coefficients were got finally by minimizing the estimation of lidar function and the real one.The verification of retrieval method was performed using the scanning data from the long-range scanning lidar.The result shows that the retrieved result has the same tendency of height compared with the result from the multi-angle method,and twin scanning lidars can provide the aerosol distribution in cross scanning region profile which has advantage compared to the single profile.