The Optic Properties Of Smoke Aerosol By Remote Sensing Simulation Experimental Observation

Surface high temperature targets(forest fires,volcanoes,straw burning,etc.)burn or erupt at the same time generate a lot of smoke,affecting the imaging quality of surface targets and the accuracy of remote sensing interpretation.The influence law and influence mechanism of smoke aerosol on remote sensing information are the scientific problems to be solved in the field of atmospheric parameter remote sensing inversion and environmental monitoring.Although the current aerosol scattering and absorption theory is perfect for the fitting of aerosol optical properties,theoretical and experimental applications are widely used,but the optical properties of smoke aerosols based on hyperspectral data are relatively rare,and the optical properties of smoke aerosols are applied.The research and application examples of smoke particle concentration inversion are not rich enough,and there is still no favorable theoretical and experimental support for the application of atmospheric environment monitoring and evaluation.Therefore,based on the theory of scattering,absorption and radiation transmission,this study uses the remote sensing simulation method to simulate the combustion of biomass by cigarette smoke to generate smoke,through the Bouguer-Lambert law and the smoke-scattering in the visible-near-infrared range.The theoretical model establishes the correlation between the extinction coefficient and the backscattering coefficient of smoke aerosol particles on the microscopic scale and the transmittance and reflectivity of smoke on the macroscopic scale.The simulation of the smoke transmission rate and reflectance changes with concentration.The characteristics of the regression analysis method are used to obtain the smoke extinction coefficient and the backscattering coefficient.Finally,the forward model is applied to the inversion of forest fire smoke concentration in the research area of the Qigan forest farm in Daxing'anling.The main conclusions of this study are as follows:1.The experimental observation of the aerosol aerosol extinction coefficient found that the regression equations of all visible-near-infrared bands were tested by the correlation coefficient test 0.01 significance test.The aerosol aerosol transmittance and the aerosol aerosol concentration were compliance with the Burg-Lambert's law in the visible-near-infrared range;The mass extinction coefficient inversion of PM1.0,PM2.5,and PM10 smoke concentrations is mainly distributed in the visible-near-infrared range between 1.43-9.05m2/g,0.32-1.99m2/g,0.18-1.12m2/g.Comparing the results of mass extinction coefficient of biomass combustion aerosol in related research,the values of mass extinction coefficient are similar,and the results are credible;the mass extinction coefficient of smoke aerosol has a single peak distribution with wavelength,and the peak wavelength is around 560 nm.2.The experimental observation of the aerosol backscattering coefficient found that the linear regression equation of the volume backscattering coefficient and the smoke concentration in the visible-near-infrared inner band passed the correlation coefficient test 0.01 significant,the smoke volume backscattering coefficient and the smoke concentration.With a linear relationship,the slope is the mass backscatter coefficient;The experimental observation of the aerosol extinction coefficient shows that the mass extinction coefficients of PM1.0,PM2.5 and PM10 inversion are mainly distributed in 1.43-9.05m2/g,0.32-1.99m2/g and 0.18-1.12m2/g respectively.The smoke aerosol mass backscattering coefficient has a single peak distribution with wavelength,and the peak wavelength is around 560 nm.4.The smoke aerosol optical property parameter test found that the density inversion error value is the best inversion in the 450-530 nm,and the Landsat8 image is the second band(450-515 nm,center wavelength 483nm).Through the application of the smoke concentration inversion of Landsat8 image data,it is found that the inversion of the smoke concentration in the visible light bands is similar and can be applied to the concentration inversion.Compared with the optical thickness of the second-band optical thickness and other scholars' inversion of biomass aerosol or biomass combustion,the inversion values are close and the results are credible.