Aerosol Observation And Inversion Based On 1.5?m Lidar

Atmospheric aerosol refers to a heterogeneous dispersion system composed of solid and liquid particles and gas carriers suspended in the atmosphere,such as smoke,dust,pollen,cloud droplets,etc.Atmospheric aerosols not only have a direct impact on human health,but also have an important impact on many atmospheric physical processes.In the study of atmospheric aerosols,there are two main observation methods:direct detection and remote sensing detection.Direct detection mainly uses in-situ measurement instruments,such as black carbon instrument,particle spectrometer,gas composition detector,etc.,which installed in ground base station,sounding balloon,aircraft other kind of carriers.Because of the small sampling range and low spatial-temporal resolution of direct measurement,more and more people are interested in remote sensing detection.Lidar,as a new active optical remote sensing equipment,has been widely used in the detection of aerosol in the boundary layer because of its advantages in large detection span,high spatial-temporal resolution and high measurement accuracy.This paper introduces the development process of 1.5?m eye-safe aerosol lidar,which is divided into four chapters.The first chapter is the introduction.This chapter introduces the main application of lidar remote sensing and some research progress of spaceborne lidar and ground based lidar.In this paper,the research status of measuring the size distribution of aerosols by light scattering method at home and abroad is reviewed and summarized.The second chapter is aerosol inversion method based on lidar.Firstly,three main scattering forms in the atmosphere are introduced,and the scattering efficiency factors and other parameters are calculated according to the Mie scattering theory.Then three retrieval methods of aerosol extinction coefficient are introduced,and detailed error analysis is carried out.According to the results of error analysis,a new near-field iterative extinction coefficient inversion method is proposed,which can automatically determine the position of reference point,iterate the extinction coefficient value of reference point,and reduce the measurement error of aerosol extinction coefficient.A set of three wavelength lidar algorithm is developed to retrieve particle size distribution and mass concentration with the obtained extinction coefficient,and the error analysis is also carried out.The third chapter is atmospheric aerosol observation based on 1.5?m lidar.This paper introduces:(1)the system development of 1.5?m visibility lidar and the actual observation results of spring and Autumn Festival in Hefei;(2)the algorithm of PM 10 measurement by 1.5?m lidar,based on the aerosol model of CALIPSO satellite,studies the error of PM 10 measurement at different wavelengths,and verifies it in Hefei;(3)the development of fixed-point 1.5?m human eye safety lidar,as well as typical local pollution generation events and external transmission pollution events observed in summer in Jinan area;(4)the development process of scanning 1.5?m lidar,as well as the fast transmission process of pollution clusters observed in spring in Jinan area.The fourth chapter is summary and prospect.This chapter summarizes the main innovation points of this paper,and prospects the follow-up work.