In this paper we consider the influence of various parametrizations of aerosol-cloud-interaction on the total solar radiation and cloud transmission at the earth's surface according to the INMCM5 model. Several 10-year numerical experiments were carried out with/without three parametrizations of this interaction. In addition, numerical experiments with different emissions of aerosol precursor gases for 1980 and 2005 were performed. We show that the account for aerosol particles in aerosol-cloud interaction leads to an increase in the cloudiness by an average of 0.1 and a decrease in the total radiation by 25 W/m2. As a result, there is a decrease in the air temperature by an average of 2 degrees for all months of the year. This result confirms the theoretical assumptions about the increase of the cloud albedo effect with a decrease in the effective radius of the particles. However, numerical experiments with different emissions of aerosol precursor gases for 2005 and for 1980 revealed that at lower emissions there is a decrease in cloud transmission and an increase in the cloudiness. The probable causes of the observed effect are discussed.
The radiation effects of aerosol in clear sky under continental aerosol (Meteorological Observatory of MSU (Russia), Lindenberg Observatory (Germany)), over semi-desert areas (Israel) and Arctic district at the Tiksi International Hydrometeorological (Russia) observatory were estimated using the mesoscale COSMO-Ru model. The effect of aerosol on the surface air temperature is also was investigated. For the present study we use the aerosol dataset from CIMEL (AERONET) sun photometer measurements and the data of shortwave radiation components based on reliable instruments Kipp&Zonen. The application of the new MACv2 climatology radiation model provides the annual average relative error of the total global radiation which does not exceed 25 W/m2. We suggest that in clear sky conditions the sensitivity of air temperature at 2 meters to aerosol in all considered geographical areas lie within 0.9°C per 100 W/m2 change in shortwave net radiation changes.