摘要 : Based on the results of multiyear measurements of spectral atmospheric transparency in the wave-length range of 0.37–4 μm, we discuss the regularities of daytime variations of the characteristics of aerosol optical depth (AOD) and... 展开 Based on the results of multiyear measurements of spectral atmospheric transparency in the wave-length range of 0.37–4 μm, 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 suggest an empirical model for the daytime behavior of atmospheric AOD in the wavelength region of 0.37–4 μm, which is based on the use of the daily average values of the Angstrom parameters. We discuss the effect of the daytime AOD variations on the instan-taneous 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 taking into account both the average daytime variations of the AOD as well as relatively large AOD variations during the day characteristic of a concrete situation. 收起