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Atmospheric precipitation is an important factor in the self-purification of the atmosphere from trace impurities of both natural and anthropogenic origin. Microparticles in the atmosphere are effectively removed from it, both with precipitation and in the form of dry precipitation. Snow cover is a natural plate storage of pollutants falling out of the atmosphere in dry form and with precipitation. The study of the chemical composition of microimpurities in solid sediments in the zone of accumulation of glaciers opens up significant opportunities in the study of background monitoring of air pollution. The microstructural analysis and chemical composition of the microparticles of the snow-ice stratum of high-mountain glaciers allows determining the composition of aerosols, the rate of their receipt, genesis, as well as the exact dating of the layers according to the historical time interval. In the paper we present microparticle concentration falling on the glacier surface determined when obvious precipitation (dry fallout) has not been observed. Dry fallout monitoring has been conducted for different elevations of Elbrus Region including its bottom valley and upper level of 4000m a.s.l. The concentration of water-solid insoluble particles in snow samples has been determined using electron and optical microscopes. The results revealed a clear vertical volume and size distribution of microparticles (MP), as well as their modification during the summer and autumn months. The heavy metal (HM) concentrations in snow have been determined using emission spectral analysis. Keywords—aerosol; glacier; impurity concentration; snow layer; precipitation; ascending currents

Regional Pollution and Its Formation Mechanism over Greater Caucasus Glacier Taking into Account Atmospheric Dry Deposition