Distribution Of Aerosol Extinction Coefficients And Slant Visibility Measured By Lidar

In the paper, design and feasibilities of a lidar and the theory of atmospheric aerosol extinction coefficients detection based on lidar are introduced. A system of lidar on the basis of Mie scattering is presented. Making use of the Mie scattering of atmospheric aerosols, the system detects the aerosols and gets some atmospheric coefficients, such as distribution of the aerosols , visibility and the atmospheric boundary layer altitude.The principle research of this paper is the detecting of slant visibility using the Mie scattering lidar. A new detection method taking advantage of multi-elevation angles with lidar is presented for measuring atmospheric slant integral visibility. In this method, extinction coefficient is replaced by optical depth in order to solve slant visibility. This method can overcome the defect that values of slant visibility are hard to detected precisely because of multi-scatter of atmosphere under low-visibility and improve the precision that can provide more accurate meteorologic parameters for flying-off and landing of airplane. Moreover, Monte-Carlo method is used to simulate integral visibility measured by the above method on the three different conditions of atmospheric extinct distribution.At the meantime, the Atmospheric aerosol extinction coefficient at west suburb of Hefei was continuously detected. And some two-dimensional distributions of aerosol' extinction coefficient and their evolving figures were yielded by corresponding data processing means. These results not only roundly reflect the distribution of aerosol' extinction coefficient of some longitudinal cross section in atmosphere space but also obviously display the integral changing tendency of this distribution. And they will be important to real-time monitoring of atmospheric environment in future.