Abstract. Hydrochemical monitoring of inland waters allows to assess their conditions and to estimate the impact of climate change. During the last decade, relevance of the research related to the impact of permafrost thaw on the state of small lakes in the Arctic has been growing. This study aims to investigate the impact of thermodenudation on the ionic composition of small tundra lakes in Yamal peninsula. The influence of interannual fluctuations in air temperature and precipitation on the ionic composition of lakes has been statistically established - the content of NO₂^-, Br^-, NO₃^-, HCO₃^- at the level of significance p = 0.05. Active thermodenudation on the shores of these lakes leads to the uptake of mineralization levels by an average of 42.8% and changes the concentration of major ions Na, Ca, Mg, K, PO₄, HCO₃. Herewith, the climatic fluctuations can have a greater impact on the ionic composition compared to thermodenudation. Significant increase in precipitation and annual air temperatures intensifies the thawing processes within retrogressive thaw slumps and leads to the increase in mineralization of small lakes, Ca, Mg, NH₄ и HCO₃ ions in particular.

Keywords: thermodenudation, small tundra lakes, hydrochemistry, climate changes, Yamal, retrogressive thaw slump

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