Data of multiyear sun photometer measurements in the Asian part of Russia are used to analyze the issues regarding the modeling of annual and spectral behaviors of the atmospheric aerosol optical depth (AOD) based on separation of the contributions of fine and coarse aerosols. The specific features of the spatial distri bution and seasonal variations in AOD characteristics in different regions are discussed; and a three parameter model of annual behavior of spectral AOD in the range 0.34-4 µm for Western Siberia (Tomsk) is suggested.
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