CCD激光雷达探测边界层气溶胶消光系数垂直分布

Vertical Distribution of Aerosol Extinction Coefficient Detection in Boundary Layer Using CCD Lidar

提出了一种反演边界层以下气溶胶消光系数垂直廓线的方法。设计了一种以电荷耦合器件（CCD）为探测器、激光器为发射端的收发分置激光雷达系统（CCD激光雷达）。基于此系统测量了水平激光束图像与垂直激光束从地面起0-1.2 km高度的气溶胶角散射灰度图像。利用水平散射图像得到大气散射相函数相对值，将其作为参数反演了垂直方向的气溶胶消光系数分布廓线。将得到的消光系数值与合肥大气辐射观测站的双波长偏振米散射激光雷达（DWPL）的观测结果进行了对比，结果表明两者一致性较好。同时给出了合肥地区4个夜晚连续观测的气溶胶廓线分布。CCD激光雷达优势在于无盲区，在近地面空间分辨率可达0.032 m/pixel，在边界层以下气溶胶探测具有潜力。

A method for the retrieval of the aerosol scattering coefficient profiles in boundary layer is presented. A bistatic lidar system （CCD Lidar） with charge coupled device （CCD） as the detector and laser as transmitter is constructed. Aerosol scattering images of a horizontal laser beam and a vertical laser beam from ground to 1.2 km are imaged based on the CCD lidar system. The relative atmospheric scattering phase function （SPF） can be obtained by the aerosol scattering image of the horizontal laser beam, and the aerosol extinction coefficient （AEC） profile is inverted using the relative SPF. The AEC measured by CCD lidar has shown good agreement with that measured by double wavelength polarization lidar （DWPL） in 400 m and 600 m. Four nighttime AEC profile contours observed in Hefei are given. CCD lidar needs no overlap correction, it has a high spatial resolution of 0.032 m/pixel, and is expected as a potential technique of aerosol detection in boundary layer.