Atmospheric aerosol measurements and the reliability problem: new results

Abstract

Atmospheric aerosol measurements and the reliability problem have been discussed previously. New results of the inverse problem solutions are discussed here. The relationship between the backscattering coefficient and the extinction coefficient was found for different approximations of the integral method using finite duration probe pulses. The optical thickness of the atmosphere was determined by methods of multiposition probing without numerical integration. The integral algorithms for the determination of the extinction coefficients can be more accurate than the algorithms for the determination of the optical thicknesses. New algorithms were developed for the determination of the relationship between the optical parameters of aerosols. New lidar equation solutions developed for weak signal processing were investigated. The errors of the extinction coefficient for different minimizing procedures were considered based on the weighting coefficients. A method was developed to determine the weighting coefficients. The preliminary calculated parameters were used for more accurate linearization of the inverse problem. The model of spherical particles with the radially variable refractive index was considered. The effectiveness of the proposed model is based on the possibility of choosing the thickness of inhomogeneous coating depending on the particle size. The proposed model can explain the significant discrepancy found between the photoelectric and filter aspiration results and can be used to minimize the error of particle size optical determination.