Аннотация:Lake Mogilnoe is a representative of insufficiently studied meromictic waterbodies located beyondthe Arctic Circle and has an underground connection with the Barents Sea. This paper presents some aspectsof the lake environmental status based on data on the distribution of sulfur compounds (as a marker of therate of anaerobic processes in the waterbody), redox-dependent chlorophenolic compounds, and organo-chlorine compounds from the persistent organic pollutant group in bottom sediments and soils of the lakecatchment area. Hydrogen sulfide contamination of lake waters observed throughout the 20th century hasbeen confirmed to be in progress: an increase in hydrogen sulfide concentrations in the monimolimnion(210 mg/L) and increase in its distribution boundary. The contents and specific features of the distribution ofreduced sulfur compounds in Lake Mogilnoe sediments are comparable to those in bottom sediments ofmarine waterbodies with euxinic anoxia. The presence of organochlorine compounds (including persistentorganic pollutants) in bottom sediments and soils of the lake catchment area may be related not only to trans-port by air and water flows, but also to anthropogenic impact on the lake in the 20th century.
