We present the method of calculation of the shortwave radiative fluxes under clear-sky conditions, based on the combination of the algorithm of statistical simulation and a modification of the k-distribution technique. An approach to the choice of the input parameters, required for the calculation of the radiative fluxes and direct component of aerosol radiative forcing at the top and bottom atmospheric boundaries is described. The approach is based on the combination of results of the multiyear sun photometer measurements of aerosol optical depth in the wavelength range 0.37-4.0 m and atmospheric moisture content in the region of Tomsk and known models of aerosol, atmospheric gas constituents, and underlying surface for determination of the missing parameters (single scattering albedo, aerosol particle scattering phase function, and surface albedo).
aerosol; atmospheric gases, solar radiation; Monte-Carlo method