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Atmospheric and Oceanic Optics

2019 year, number 10

Correction of the aerosol refractive index using the regression relationship between the volume concentration of particles and measurements of aerosol optical depth

V.V. Veretennikov, S.S. Men’shchikova
V.E. Zuev Institute of Atmospheric Optics of Siberian Branch of the Russian Academy of Science, Tomsk, Russia
Keywords: аэрозольная оптическая толщина, обратные задачи, микроструктура аэрозоля, показатель преломления, регрессия, aerosol optical depth, inverse problems, aerosol microstructure, refractive index, regression

Abstract

A method of regression correction of the real part of the refractive index of the aerosol matter is suggested for solving the inverse problem of spectral measurements of aerosol optical depth (AOD) t(l). The correction is based on the use of similarity relations that must be fulfilled for the microstructure parameters of the scattering media with equivalent spectral extinction at variations in the refractive index of the aerosol. For the correction, the minimization of the discrepancy between the volume concentrations of the aerosol retrieved from the solution of the inverse problem and calculated using the regression equations, which are constructed for a certain reference period, is carried out by the refractive index. The results of testing the method are presented based on the AOD measurements with a multiwave sun photometer, performed at IAO SB RAS during an annual cycle of observations.