Mercury in the world’s largest hypersaline lagoon Bay Sivash, the Sea of Azov

Shadrin, Nickolai; Stetsiuk, Aleksandra; Latushkin, Alexandr A.; Anufriieva, Elena

doi:10.1007/s11356-021-12745-9

Cited by 8 publications

(4 citation statements)

References 45 publications

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“…Currently, in different seasons and different parts of the bay, according to calculations, the oxygen concentration should be 20-50% lower than before the start of the salinity increase. An increase in salinity, as well as changes in other physical and chemical parameters, shift the geochemical background of the lagoon ecosystem, including the solubility of various salts, as well as direction and character of some reactions [35][36][37][38]. All this may often increase the concentration of toxic substances adding more extremality to the environment.…”

Section: Discussionmentioning

confidence: 99%

Human-Induced Sharp Salinity Changes in the World’s Largest Hypersaline Lagoon Bay Sivash (Crimea) and Their Effects on the Ecosystem

Anufriieva

Колесникова

Revkova

et al. 2022

Water

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Lakes and lagoons play an important role worldwide, and salinity fluctuations significantly affect their ecosystems. Bay Sivash, the world’s largest hypersaline water body, underwent a sharp change in salinity, induced by the closing of the North Crimean Canal. To monitor a shift in the ecosystem, a study was carried out from 2014 to 2020 at 15 sites of the lagoon. Since the closure of the canal, the average salinity increased from 22 g L−1 (2013) to 94 g L−1 (2020). Suspended solids and dissolved organic matter also increased. When salinity increased above 50 g L−1, the number of taxa significantly decreased; this was a negative linear relation. The increase in salinity significantly changed the structure of zooplankton and benthos. The most dramatic changes occurred with the salinity increase from 25 to 70 g L−1. Chironomidae larvae numbers began to increase greatly in the ecosystem of the bay, and since 2014, they have rapidly increased their contribution to the abundance of benthos and plankton. The concentration of benthic–planktonic species increased in plankton, in particular, in Harpacticoida and Chironomidae. At salinity above 80–90 g L−1, nauplii and adult brine shrimp appeared to become abundant in plankton and benthos. The transit of the ecosystem to a new alternative state occurred.

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Section: Discussionmentioning

confidence: 99%

Human-Induced Sharp Salinity Changes in the World’s Largest Hypersaline Lagoon Bay Sivash (Crimea) and Their Effects on the Ecosystem

Anufriieva

Колесникова

Revkova

et al. 2022

Water

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“…Additionally, a hydrodynamic steady state was assumed to balance the sediment and water budgets [ 48 ]. The SoA has a significant salinity and suspended solids gradient due to the impact of riverine discharge, which also affects Hg concentrations in the sediment and water column [ 49 ]. As the use of the HERMES model in this study is intended to approximate reported values and estimate currently unknown, undocumented, or unconsidered Hg emissions and loadings, further increases in the spatiotemporal resolution were deemed unnecessary.…”

Section: Methodsmentioning

confidence: 99%

Mercury Dynamics in the Sea of Azov: Insights from a Mass Balance Model

Gade,

von Hellfeld,

Mbadugha

et al. 2024

Toxics

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The Sea of Azov, an inland shelf sea bounding Ukraine and Russia, experiences the effects of ongoing and legacy pollution. One of the main contaminants of concern is the heavy metal mercury (Hg), which is emitted from the regional coal industry, former Hg refineries, and the historic use of mercury-containing pesticides. The aquatic biome acts both as a major sink and source in this cycle, thus meriting an examination of its environmental fate. This study collated existing Hg data for the SoA and the adjacent region to estimate current Hg influxes and cycling in the ecosystem. The mercury-specific model “Hg Environmental Ratios Multimedia Ecosystem Sources” (HERMES), originally developed for Canadian freshwater lakes, was used to estimate anthropogenic emissions to the sea and regional atmospheric Hg concentrations. The computed water and sediment concentrations (6.8 ng/L and 55.7 ng/g dw, respectively) approximate the reported literature values. The ongoing military conflict will increase environmental pollution in the region, thus further intensifying the existing (legacy) anthropogenic pressures. The results of this study provide a first insight into the environmental Hg cycle of the Sea of Azov ecosystem and underline the need for further emission control and remediation efforts to safeguard environmental quality.

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“…During the cruises on the RV "Professor Vodyanitsky" in the autumn of 2018 and summer of 2019, complex studies were carried out, including an analysis of the hydrochemical characteristics of the water column and geochemical characteristics of bottom sediments in the coastal areas of the Crimean Peninsula (Figure 1). ying the features of the accumulation and spatial distribution of various pollutants in the water areas of the Crimean shelf [2,4,25] and closed and semi-closed lagoons [26,27]. Some works [28,29] are devoted to the study of the vertical profiles of the key redox species in pore waters of the bottom sediments obtained by voltammetry.…”

Section: Methodsmentioning

confidence: 99%

“…Earlier studies are reflected in the works of [23,24]. Currently, the geochemical characteristics of bottom sediments arouse great interest within the framework of studying the features of the accumulation and spatial distribution of various pollutants in the water areas of the Crimean shelf [2,4,25] and closed and semi-closed lagoons [26,27]. Some works [28,29] are devoted to the study of the vertical profiles of the key redox species in pore waters of the bottom sediments obtained by voltammetry.…”

Section: Introductionmentioning

confidence: 99%

Characteristics of Bottom Sediments in the Coastal Areas of the Crimean Peninsula

Gurova

Gurov

Orekhova

2022

Land

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The aim of this work was to assess the influence of physical, chemical, and hydrochemical factors on the characteristics of bottom sediments in various areas of the shelf of the Crimean Peninsula. The data obtained during the cruises of the RV “Professor Vodianitsky” in the fall of 2018 and summer of 2019 were analyzed. Hydrochemical analyses of the bottom waters were carried out using standard hydrochemical methods. Profiles of dissolved oxygen, hydrogen sulfide, and oxidized and reduced forms of iron in pore waters were obtained, and the geochemical characteristics of bottom sediments were determined. The features of their spatial and vertical distributions were considered. Pelite-aleuritic sediments with inclusions of sandy material and shell detritus prevailed in the coastal zone of the Crimean shelf. The organic carbon content varied from 0.5–0.6% in the gravel–sand sediments of the Kerch pre-strait area to 2.5–2.7% in the northwestern part. The prevalence of suboxic conditions was noted, and the main processes in the sediment upper layer were controlled mainly by reactions involving iron. In some areas of the southern coast of Crimea and the Kerch pre-strait area from the Sea of Azov, the development of anoxic conditions in the surface layer of bottom sediments was recorded.

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Mercury in the world’s largest hypersaline lagoon Bay Sivash, the Sea of Azov

Cited by 8 publications

References 45 publications

Human-Induced Sharp Salinity Changes in the World’s Largest Hypersaline Lagoon Bay Sivash (Crimea) and Their Effects on the Ecosystem

Human-Induced Sharp Salinity Changes in the World’s Largest Hypersaline Lagoon Bay Sivash (Crimea) and Their Effects on the Ecosystem

Mercury Dynamics in the Sea of Azov: Insights from a Mass Balance Model

Characteristics of Bottom Sediments in the Coastal Areas of the Crimean Peninsula

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