Peculiarities of seasonal variability of diurnal behaviors of the mass concentration of the submicron aerosol and Black Carbon (BC) in near-ground layer, based on the measurements carried out in 1997-2008 at the Aerosol station of IAO SB RAS has been analysed. The shape of the diurnal behaviors of the aerosol and BC are the same for all seasons and contains the morning and evening maxima, and the nighttime and daytime minima. Maxima in the diurnal behavior of concentration of the aerosol approach to each other in winter and move away from each other in summer. The stability of the shape of the BC diurnal behavior in different seasons of the year is a factor of stable diurnal dynamics of the aerosol absorption coefficient in the visible range of a spectrum. Certain differences in the diurnal behavior of the aerosol and BC make it possible to draw a conclusion on the presence of some soot fraction of aerosol as an external admixture. All extremums of the diurnal behaviors of the concentrations of aerosol and BC are the best pronounced in the cloudless atmosphere, however, in continuous cloudiness the diurnal behaviors are smoothed. Herewith, the morning maximum of the aerosol becomes statistically insignificant in different seasons of the year.
submicron aerosol, Black Carbon, near-ground layer, diurnal behavior, cloudiness