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Atmospheric and Oceanic Optics

2015 year, number 10

Retrieval of the aerosol microstructure from light extinction data measured in a limited spectral range

V.V. Veretennikov, S.S. Men’shchikova
V.E. Zuev Institute of Atmospheric Optics of Siberian Branch of the Russian Academy of Science, 1, Academician Zuev square, Tomsk, 634021, Russia
Keywords: аэрозольная оптическая толщина, микроструктура аэрозоля, обратные задачи, aerosol optical depth, aerosol microstructure, inverse problem

Abstract

The influence of the upper limit λ max of the spectral range, in which atmospheric transmission measurements are performed, on retrieving aerosol microstructure parameters is investigated. Aerosol microstructure parameters are determined by solving the inverse sun photometry problem using data of numerical simulation and field experiments. The aerosol model formed by fine ( f ) and coarse ( c ) particle fractions is used in the numerical experiment. The value of λ max is chosen in the range from 1.052 to 3.973 mm. The method of integral distributions is used for solving the inverse problem. It is shown that the contribution of large particles to the total aerosol distribution is underestimated. In particular, at λ max = 1.246 μm, the losses in the retrieval of concentration of c-particle fraction can achieve 42% against the 18% decrease in the aerosol volume concentration.