Retrieval Of Aerosol Optical Properties And Black Carbon Concentration Using Satellite Remote Sensing Observation

It is a challenge to retrieve the aerosol optical properties and black carbon concentration using the satellite remote sensing data.Therefore,in this paper,based on the theory of radiation transmission model and effective medium model,we intensified the retrieval of the physical and optical characteristics of aerosols.The aerosol concentration retrieval algorithm and model were preliminarily verified at first.Moreover,the sensitivity of the selected effective model,the aerosol endmember composition,and the black carbon concentration to the atmospheric aerosol particle's optical properties were explored.In addition,the sensitivities of aerosol optical properties to the radiance at top of atmosphere are analyzed and the error sources of aerosol optical depth and black carbon concentration retrieval results are proposed.At last,combined with near-surface wind field vector data and in-situ data,global biomass combustion cases were proposed using the PARASOL satellite observations.The specific research content includes the following aspects:(1)Based on the theory of radiation transmission,the effective medium model is embedded in the forward radiation transmission model,the aerosol absorption and scattering characteristics under the mixed state simulated by the effective model are used as the parameter input of the radiation transmission model.By using the Effective medium-Radiation transmission coupling model and statistical optimization algorithm,a scheme of atmospheric particle optical properties and the black carbon volume concentration retrieval based on satellite data was proposed,which was used to construct the maximum likelihood between the apparent reflectance and retrieval parameters.For the purpose of optical thickness and black carbon concentration inversion,the Jacobi matrix was used to perform iterative interpolation calculations through numerical calculations to obtain the best fitting and achieve the purpose of aerosol retrievals.(2)Based on the proposed algorithm,we retrieved the aerosol optical thickness and black carbon concentration by using the PARASOL observations.In addition,the model algorithm,the retrieval results of aerosol optical depth and black carbon concentration were initially validated by using the ground observation data.The accuracy of quantitative retrieval results under different retrieval level were analyzed.(3)Based on the effective media model theory,Mie scattering theory and radiation transmission model,the scattering and absorption characteristics of atmospheric aerosol particles under different aerosol component conditions are simulated.Furthermore,combined with the verification results,the sensitive studies of aerosol optical properties and surface albedo to the apparent reflectance are proposed.(4)The case studies were conducted on a global scale by using the PARASOL multi-angle observations,including case studies of biomass burning and non-biomass burning pollution over eastern China and the plains of the Ganges in and South Asia;Five cases of wildfires in the northwestern United States and the spatial and temporal distribution of annual total emissions of black carbon aerosols in eastern China and South Asia were further calculated and preliminary discussed.