为了研究合肥上空对流层大气气溶胶的光学特性,研制了一台Raman-Mie激光雷达,用来测量大气气 溶胶的消光系数、后向散射系数和激光雷达比的垂直分布。介绍了研制的Raman-Mie激光雷达 系统和数据处理方法,并且给出了几个测量结果。在冷锋过境时,激光雷达测量的整层对流层中大 气气溶胶的后向散射系数的时空变化表明,大量的气溶胶粒子被冷空气输送到合肥上空,大气气溶 胶在4 km以下的垂直分布有剧烈的变化,混合层顶的高度被抬升到了3 km附近。Fernald方法和Raman方 法反演的大气气溶胶光学特性的对比结果表明,该激光雷达能够测量合肥上空大气气溶胶层中的 消光系数、后向散射系数和激光雷达比廓线。

In order to investigate the tropospheric aerosol optical properties over Hefei, a combined Raman elastic-backscatter lidar was developed for vertical profiling aerosol extinction, backscatter and lidar ratio. The lidar and data processing were introduced, and some measurements were presented. The temporal and vertical variations of the aerosol backscatter coefficient in the troposphere were observed using the lidar during the passage of the cold front, an amount of particles could be taken to Hefei with the cold air mass, the vertical distribution of the aerosol in the lower troposphere varied extremely, and the height of the top of mixing layer could be lifted up to about 3 km above ground level. The comparisons between aerosol optical properties retrieved using Fernald method and Raman method showed that extinction, backscatter and lidar ratio profiles in the lifted aerosol layer cloud be measured using the lidar.