INTERANNUAL CHANGES OF ORGANIC MATTER CONCENTRATIONS IN SNOW AND ICE COVER ON THE FRINGES OF THE KANDALAKSHA BAY OF THE WHITE SEA

The results of long-term study (early February 2010, 2012 and 2015) of organic matter (organic carbon, lipids and hydrocarbons) in comparison with the content of suspended matter in snow–ice cover of the Rugozerskaya Bay, region of the MSU Biological Station (BBS), the periphery of the Kandalaksha Bay of the White Sea are presented. It is shown that the differences in accumulation of the studied compounds depend on physical conditions of snow and ice formation and biogeochemical processes occurring at the snow–ice and ice–water boundaries. In snow, the content of organic matter in February remained almost the same in different years (not exceeding 34 mg/l), because in the beginning of winter the BBS activities has virtually no effect on the pollution of snow cover. At the same time the combustion spheres were found in suspended matter of snow along with mineral particles, diatoms and spores of plants. Dominance of pyrene in the composition of polycyclic aromatic hydrocarbons in the snow points at the intake of organic matter pyrolysis products from the atmosphere, the amount of which increases from February to March. According to the conditions of ice formation the concentration of studied compounds occurs in different parts of the ice core. In the top part, and in snow, the mineral part prevailed over the biological one. The algae species diversity consistently increased from the snow to the bottom layers of ice. By March, the accumulation of organic matter occurs in the lowest layers of ice due to the active biogeochemical processes at the ice–water boundary. The obtained data was compared with the results of studying the organic matter in snow and ice in other parts of the White Sea and in the reference areas of theArcticand Antarctic. 

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