利用激光雷达测量都市上空气溶胶的浓度分布

Studies of Urban Aerosols in Macao using a Horizontal Mie Lidar

测量都市上空气溶胶浓度分布的最方便方法是水平米散射激光雷达。因激光雷达是主动遥感监测系统,其测量距离可达到几公里,而且具有高时空分辨率的特点。同时,其设计也可以达到激光安全标准。本研究所用的激光雷达系统是安装在海拔118米高的山上。在观测时可以测量稠密市区上空的气溶胶分布与及监察从发电厂排放出的微粒。本文介绍这激光雷达系统的设计及激光雷达反演的方法。会对激光雷达量度的消光系数与大气监测的可悬浮粒子浓度之间的相关性进行考证。

Aerosol concentrations over upper atmosphere of urban districts can best be monitored with a horizontal Mie scattering Lidar system. Active remote sensing lidar system can effectively measured the extinction over several kilometres and yet achieve eye safety requirements in high spatiotemporal resolution. The lidar system used in this paper is situated in a hill of 118 m above sea level. It has been able to monitor the distribution of the atmospheric aerosols over the urban area and the emission concentrations from the stacks of electric power plant as well. In this paper, the design and method of inversion of the lidar system are described. The correlation between lidar measured extinction coefficients and the respirable suspended particulate concentrations are discussed.