Early diagenesis of bottom sediments of freshwater lakes of the Vaygach island

Kokryatkaya, N. M.; Шевченко, В. П.; Titova, K. V.; Vakhrameeva, Elena; Алиев, Р. А.; Grigoriev, V. A.; Savelieva, Larissa A; Максимов, Ф. Е.; Kuznetsov, V. Yu.

doi:10.30758/0555-2648-2020-66-4-534-554

Problemy Arktiki i Antarktiki

2020

DOI: 10.30758/0555-2648-2020-66-4-534-554

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Early diagenesis of bottom sediments of freshwater lakes of the Vaygach island

N. M. Kokryatkaya

В. П. Шевченко

K. V. Titova

et al.

Abstract: Приведены результаты комплексных исследований процессов диагенетического преобразования донных осадков пресноводных озер о. Вайгач-Талатинское и Тундровое. Установлено (по данным спорово-пыльцевого анализа), что формирование донных отложений оз. Талатинское происходило в современных климатических условиях тундры. Показано, что отсутствие закономерностей в распределении всех изучаемых параметров и невозможность определения скорости осадконакопления, обусловлены перемешиванием отложений обоих озер в ходе сезонно… Show more

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Cited by 3 publications

References 9 publications

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Ecological state of water bodies under the influence of natural and anthropogenic factors

Titova,

Zhibareva,

Sloboda

et al. 2023

BIO Web Conf.

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The article studies the ecological state of two neighboring lakes Sredniy and Nizhniy Pert on the Bolshoy Solovetsky Island after their separation by a dead earthen dam during the construction of the lake-channel system. The studies were carried out in July 2021. It was revealed that these anthropogenic changes led to a change in the regime of lakes, especially Nizhniy Perth, which lost its flow. Samples of water and bottom sediments were taken from the deep waters of these reservoirs. In these samples, the main hydrochemical parameters were determined, and bottom sediments were studied for the content of moisture, iron and sulfur, organic carbon and nitrogen in them. A difference was noted in the water color of the studied lakes, which is due to anthropogenic influence and the isolation of water bodies, and in their mineralization, which is associated with the location of water bodies relative to the White Sea. A greater amount of organic matter (carbon) was found in the water and bottom sediments of the lake. Sredniy Perth, therefore, in the bottom layer of the water column of this reservoir, a lower oxygen content was noted compared to the neighboring lake, while in none of them did anaerobic conditions arise in the water. The C/N ratio in the sediments indicated a greater contribution of the allochthonous pathway of organic matter inflow into both lakes, and this was slightly more pronounced in the less flowing lake Nizhniy Perth. A difference in the granulometric composition of the sediments of the studied reservoirs was revealed, which is associated with a change in hydrochemical regimes and different sedimentation conditions as a result.

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Ecological state of water bodies under the influence of natural and anthropogenic factors

Titova,

Zhibareva,

Sloboda

et al. 2023

BIO Web Conf.

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The role of biochemical processes in formation of waters and bottom sediments after reduction of anthropogenic pollution

Moiseenko,

Leummens

2024

Geohimiâ

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The article is devoted to anthropogenic and biogeochemical processes that affect the water and bottom sediment (BS) formation of the subarctic Lake Imandra. The data of long-term observations were presented, showing changes in the water chemical composition during the period of maximum pollution and after decrease in anthropogenic load within the last 30 years. It was found that the content of toxic metals in water decreased, but due to climate warming, the input of organic matter and nutrients increased, which stimulated an increase in the intensity of production processes. Enrichment of water during the period of intensive heavy metal pollution led to their accumulation in bottom sediments (BS); the highest metal concentrations detected in the surface layers, which belong to the modern period of sedimentation. The development of oxygen-free conditions in bottom horizons due to sedimentation and oxidation of organic matter, which leads to metal cycling that prevents their burial was shown. Physicochemical and biogeochemical processes are considered as explaining the diffusion of metals to the surface of bottom sediments and the formation anomalously high concentrations of metals in the surface layers of BS. The hypothesis of the appearance of the diagenesis initial stage in bottom sediments was proposed.

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The Sedimentation Rate in the Crimean Hypersaline Lake Aktashskoye Estimated Using the Post-Chernobyl Artificial Radionuclide 90Sr as a Radiotracer

Mirzoeva¹,

Shadrin²,

Proskurnin³

et al. 2022

Water

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Artificial 90Sr is one of the most important long-lived radionuclides of global radioactive fallout from the atmosphere after the testing of nuclear weapons and the accident at the Chernobyl Nuclear Power Plant in 1986. In addition to fallout from the atmosphere, secondary radioactive contamination of Crimea was mainly from the Dnieper River and the North Crimean Canal, which occurred until 2014. 90Sr was used as the optimal radiotracer for estimating the rate of sedimentation in the Crimean hypersaline lake. Its vertical distribution in the bottom sediments was assessed. In the core of the bottom sediments, the detectable activity of 90Sr in layers 0–1.5 cm and 16.7–21.9 cm was absent, and it was determined again in the layer of 15.5 cm, which was associated with atmospheric fallout of the radionuclide after the Chernobyl NPP accident. There were well-isolated peaks of specific activity in layers at a depth of 4.6 and 13.3–14.3 cm. The calculated rate of sedimentation varied within 0.5–1.5 cm year−1: the minimum rate corresponded to the period 1971–2017, and the highest rate corresponded to the period 1954–1971.

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Early diagenesis of bottom sediments of freshwater lakes of the Vaygach island

Cited by 3 publications

References 9 publications

Ecological state of water bodies under the influence of natural and anthropogenic factors

Ecological state of water bodies under the influence of natural and anthropogenic factors

The role of biochemical processes in formation of waters and bottom sediments after reduction of anthropogenic pollution

The Sedimentation Rate in the Crimean Hypersaline Lake Aktashskoye Estimated Using the Post-Chernobyl Artificial Radionuclide 90Sr as a Radiotracer

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