Bottom sediments of the city lakes as a dynamic geocryological and geochemical system
https://doi.org/10.31242/2618-9712-2022-27-3-381-392
Abstract
We studied the bottom sediments of the lakes in Yakutsk in the period of 1998–2021. During the monitoring period, we observed that the chemical composition of the bottom lake sediments remained constant. The analyses showed their sulfate composition, with mixed cations, where calcium predominated, and significant changes in their salinity. Against the general background of salinity decrease in these deposits (0.018 % per year), we have noted a formation of short-term positive anomalies of salinity and long periods of desalination. The latter is determined by a decrease in the density of atmospheric fallout. Though the atmosphere in the city was under a relatively constant value of technogenic emissions, sharp changes in the volume of atmospheric precipitation were associated with the climatic factors. They affected the dynamics of salinity fluctuations in the bottom sediments of the lakes under study. Cryogenic metamorphization of the bottom sediments occurred unevenly in different parts of the lakes. In the deep parts they were poorly mineralized. Their composition was predominantly sulfate-hydrocarbonate. In the shallow parts of the lakes, they were more of saline sulfate or hydrocarbonate-sulfate composition.
Keywords
geochemistry,
city,
lakes,
bottom sediments,
salinity,
atmospheric fallout,
cryogenic metamorphization
Supporting agencies: This study was supported by the Complex Program of Foundation Scientific Research SB RAS (project no SB RAS АААА-А20-120111690008-9).
About the Authors
V. N. Makarov
Melnikov Permafrost Institute, Siberian Branch of the Russian Academy of Sciences
Russian Federation
Russian Federation
MAKAROV, Vladimir Nikolaevich, Dr. Sci. (Geology and Mineralogy), Professor, Chief Researcher
36 Merzlotnaya st., Yakutsk 677007
A. L. Sedelnikova
Melnikov Permafrost Institute, Siberian Branch of the Russian Academy of Sciences
Russian Federation
Russian Federation
SEDELNIKOVA, Alena Leonidovna, Leading Engineer
36 Merzlotnaya st., Yakutsk 677007
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Review
For citations:
Makarov V.N., Sedelnikova A.L. Bottom sediments of the city lakes as a dynamic geocryological and geochemical system. Arctic and Subarctic Natural Resources. 2022;27(3):381-392. (In Russ.) https://doi.org/10.31242/2618-9712-2022-27-3-381-392
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