Study On Spatial And Temporal Distribution And Data Analysis Of Aerosol And Water Vapor Under Pollution Conditions

The pollution problem in China has always been one of the most important issues in China's environment.With the development of China's industrialization,various forms of pollution have increased,causing widespread problems in the natural environment and human health.Among them,air pollution has become a major problem in China and poses a threat to the public health of the people.A statistical survey was conducted in 2016 show that only 84 of the 338 prefecture-level cities in China have reached the standards set by the state,and other cities have the majority of pollution.As human beings live in the atmosphere,and air quality has always been closely linked with human beings,air pollution may become the biggest health threat in China.The Beijing Municipal Government's probe in January 2013 showed that the concentration of PM2 5 reached even over 1000 ?g/m3.Especially in the cold season,PM2.5 contains K+,Ca2+,NO3-and SO4-which will cause very great health influences for the entire Beijing people.It is precisely because of this background,as well as the two projects of 973 project(observation and simulation study of cloud and aerosol climate effects)and 863 project(atmospheric parameter inversion and foundation verification).With the support of the Key Laboratory of Atmospheric Optics,Anhui institute of optics and Fine Mechanics,Chinese Academy of Sciences.Two lidars were independently developed for atmospheric exploration in Beijing.The chapter 1 of this thesis introduces the background of the whole research.The chapter 2 introduces the principle of basic lidar to detect atmospheric characteristics.The chapter 3 introduces the principle and method of lidar to detect atmospheric parameters.The chapter 4 introduces the development of two lidars;Chapter 5 introduces the analysis of the boundary layer,depolarization ratio,extinction coefficient,water vapor,and lidar ratio detected by two lidars.Chapter 6 introduces the statistical analysis of data and other data detected by lidar.The main research content is as follows:(1)In order to cooperate with the 973 project and the 863 project,this article mainly completed the development of two lidars.The first lidar is a three-wavelength eight-channel laser radar with atmospheric temperature,vapor,and aerosol.The detection location is at the Yanqi Lake Campus of the University of Chinese Academy of Sciences;the second lidar is a vapor and aerosol single-wavelength four-channel Lidar,and the detection location is Beijing China Meteorological Administration.At the same time,in order to ensure continuous automatic observation of the laser radar,a smart sunroof system was developed on the basis of the first lidar,and an invention patent was obtained.(2)Validation of the reliability and accuracy of the two lidars through the verification of the atmospheric boundary layer height,atmospheric aerosol,and water vapor.(3)The lidar ratio was detected under the three conditions of haze days,clean days.and water cloud sky,and the results were 75 sr,45 sr,and 18 sr,respectively.(4)Statistical analysis of the atmospheric boundary layer height and PM ground concentration in the three conditions of haze days,pollution days,and clean days show that:PM2.5 is affected by haze days and is about twice as polluted.Three times that of clean days;PM10 is affected by the haze days,which is about twice as polluted days and twice as clean days.(5)Contrasting the pollution situation during and the APEC meeting,the larger the water vapor.the corresponding pollution was also high.Although APEC has been harnessing the haze during the meeting,there has been a corresponding increase in pollution due to the increase of water vapor.Water vapor plays an important role in air pollution control.