Spectral properties of CDOM in a stratified reservoir with redox potential varying with depth
Yulia G. Sokolovskaya1, Elena D. Krasnova1, Dmitry A. Voronov2, Sergey A. Burikov1, Tatiana A. Dolenko1, Svetlana V. Patsaeva1; 1Lomonosov Moscow State University, Leninskie Gory, Moscow, Russia; 2Kharkevich Institute for Information Transmission Problems, Russian Academy of Sciences, Moscow, Russia
Abstract
The optical properties of natural water depend on the composition and concentration of chromophoric fraction of dissolved organic matter (CDOM), which plays as well an important role in natural biochemical processes and affects the functioning of aquatic ecosystems. Studying the composition and distribution of CDOM is of particular interest for meromictic reservoirs with stable vertical stratification. In our work we examine the spectral characteristics of CDOM in coastal meromictic lake of natural origin in the Kandalaksha Bay of the White Sea. Natural water samples were collected in June 2025 from different horizons of the Lake Bol’shie Khruslomeny (Oleniy Island, vicinity of Lesozavodsky village, Kandalaksha Bay, Murmansk Region, Russia). Hydrological characteristics were measured during field campaign. Absorption spectra, fluorescence spectra and (какая?) kinetics were measured in the filtered water samples (0,22 micrometer pore size) in laboratory. CDOM optical characteristics for surface water (positive Eh), chemocline zone (Eh around zero) and bottom sulfide water (negative Eh), were found varying. The study of DOM in different layers of coastal water bodies at different stages of isolation from the sea is important for understanding their evolution and for developing methods for environmental monitoring of aquatic ecosystems.
Speaker
Sokolovskaya Yuila
M.V. Lomonosov Moscow State University
Russia
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