Vol. 31, issue 11, article # 1

Veretennikov V.V., Men'shchikova S.S., Uzhegov V.N. Variability of microstructure parameters of the near-surface aerosol in the summer period retrieved by inverting the spectral extinction measurements along a horizontal path in Tomsk. Part I. Geometric cross section of fine and coarse particles. // Optika Atmosfery i Okeana. 2018. V. 31. No. 11. P. 857–866 [in Russian].
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Abstract:

Results of retrieval of microstructure parameters of near-surface aerosol in the summer period from spectral measurements of the aerosol extinction coefficient are presented. Experimental data were obtained in Tomsk at a horizontal path using an atmospheric transmittance meter at 11 wavelengths in the range from 0.45 to 3.91 μm. The numerical algorithm, based on the method of integral distributions, was used to solve the inverse problem. In the first part of the work, the variability of the geometric cross section of particles of the fine and coarse fractions and the total ensemble is analyzed. The influence of smoke pollution of atmosphere on the variation in microstructure parameters is considered. It is shown that fine particles make the main contribution (73–77%) to the total cross section of near-surface aerosol. The coefficients of variation of the cross sections of the particles are high in the range 53–61% for the fine and 53–69% for the coarse fractions of aerosol in monthly intervals without taking into account the influence of the smoke. Correlations between the aerosol extinction coefficients at different wavelengths and the aerosol microstructure parameters retrieved are investigated.

Keywords:

aerosol extinction coefficient, near-surface aerosol microstructure, inverse problem

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