The Ground-based Lidar Combined with Sun photometer for Aerosol Vertical Profiles and Optical Properties over Beijing

The aerosol extinction-to-backscatter ratio (so called lidar ratio) is an important parameter for inverting LIDAR signals in the lidar equation. It is a complicated function of the aerosol microphysical characteristics. In this paper, we estimate lidar ratio, which ranged from 20 to 80sr, by sun photometer. The correlation between angstrom exponents derived from sun photometer and lidar ratio for columnar mean aerosols were discussed. In this paper, we also present other columnar optical properties of aerosols such as optical depth and Angstrom exponents. The backscattering lidar and sun photometer system has been set up in the city of Beijing to provide the vertical profile of the aerosol backscatter coefficient at 532nm. The measurement has been carried out in 2011.