The influence of atmospheric circulation on the seasonal dynamics of the chemical composition of snow cover in the Pechora-Ilychsky reserve

The analysis of the layer-by-layer dynamics of snow chemical parameters in one of the observation points in the Pechora-Ilych biosphere reserve (Yaksha village) in the winter period 2019–2020 was carried out. It is shown that the chemical composition of atmospheric precipitation is more affected by long-range transport of substances. The peculiarities of atmospheric circulation and the regions from which air masses are transferred determine the saturation of precipitation with certain chemical components. The calculation of the trajectories of reverse transport of air masses allowed us to show the regions where air masses can form that come to the research area, carry substances and potentially form the chemical composition of precipitation. It is shown that the calculation of trajectories allows us to estimate the regions that are sources of pollutants entering the atmosphere. In general, this method of studying the chemical composition of snow is very informative and allows you to better understand the factors of its formation.