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Atmospheric and Oceanic Optics

2015 year, number 3

Method for determination of mass concentrations of aerosol fractions in ground air from data of multifrequency lidar sounding

S.A. Lysenko, M.M. Kugeiko, V.V. Khomich
Belarusian State University, 4, Nezavisimosti avenue, 2200301, Minsk, Republic of Belarus
Keywords: urban aerosol, respirable particles, mass concentration, remote laser sounding, multiple regressions

Abstract

The method for determination of the mass concentrations of particulate matter smaller than 1.0, 2.5, 10, and 30 mm suspended in ground air was proposed. The method involves remote lidar sounding of the atmosphere at wavelengths λ = 0.355, 0.532, 1.064, 2.13 μm, recovering the spectral-spatial distributions of aerosol extinction coefficient from the lidar signal, and their converting to the spatial distribution of the mass concentrations of aerosol fractions based on regression relations between optical and microphysical characteristics of the aerosol. To improve the accuracy and stability of the solution of system of lidar equations the choice of calibration constants and the lidar ratio at the wavelengths of the sounding radiation is carried out taking into account the multicollinearity of the spectral aerosol extinction coefficients, which is expressed in the form of multiple regression equation. The regressions were obtained in the framework of World Meteorological Organization’s optical model of urban aerosol under wide variations in model parameters which characterize the particle size distribution and the complex refractive index of the aerosol matter. The numerical experiments on remote laser sounding of the mass concentration of aerosol fractions in the atmosphere have shown the robustness of the proposed method.