Based on the results of multiyear measurements of the spectral atmospheric transparency in the wavelength range of 0.37-4mm, we discuss the regularities of daytime variations of the characteristics of aerosol optical depth (AOD) and atmospheric moisture content in a typical Siberian region (Tomsk). For different atmospheric conditions (seasons, air masses), quantitative characteristics of the average daytime behavior of the spectral AOD and Angstrom parameters are presented. We suggested an empirical model of the daytime behavior of atmospheric AOD in the wavelength region of 0.37-4mm, which is based on the use of the daily average values of the Angstrom parameters. We discuss the influence effect of the daytime AOD variations on the instantaneous and daily average values of the aerosol radiative forcing at the underlying surface level and at the top of the atmosphere. The aerosol radiative effects are analyzed both taking into account the average daytime variations of AOD, and in a concrete situation, characterized by relatively large AOD variations during day.
atmospheric aerosol optical depth, solar radiation, model of diurnal behavior of aerosol turbidity and Angstrem formula parameters, diurnal variability of aerosol radiative forcing