Long-term variability of the water transparency (Secchi Depth) in the Sea of Azov

Sorokina, V. V.; Kulygin, V.V.

doi:10.1134/s0001437013030107

Cited by 5 publications

(3 citation statements)

References 3 publications

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“…The total water discharge into the Black Sea constitutes around 53-55 km 3 /yr, while the total inflow ranges between 36 and 38 km 3 /yr [31]. This mixing of riverine and marine water results in a large salinity gradient (2-12 psu) and high TSS concentrations over the whole sea (average 19.1 mg/L [31,40]), with an average organic carbon content of 16.5% [40]. Due to the large discharge of nutrients and sediment (~25.8 mg/L TSS), the river deltas not only serve as spawning grounds for a variety of commercially valuable fish species but are also pollution hotspots [31,37,41].…”

Section: Site Description and Model Input Variablesmentioning

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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Section: Site Description and Model Input Variablesmentioning

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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“…In March and June 2016 methods for the operative remote monitoring of the Taganrog Bay and Don estuary aquatic environment state were tested, based on analyzing the shape of the spectra of the spectral brightness of the radiation ascending from the water [22]. Expeditionary materials significantly replenished the oceanographic database of the Southern Scientific Center of the Russian Academy of Sciences [23]: based on field and archival data, the long-term dynamics of organic matter and carbon, transparency and salinity of the Azov Sea [24][25][26] were estimated. The characteristics of small-scale variability of temperature, salinity, internal waves and fluctuations in the level of the Black Sea were calculated [27][28][29].…”

Section: Research Vessel Denebmentioning

confidence: 99%

Research Vessel Deneb: 10 Years of Marine Scientific Research

Matishov¹,

Stepanyan²

2019

PhO

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Study of natural and anthropogenic processes in the southern seas of Russia is a priority task of the Southern scientific center of Russian Academy of Sciences. Annually for 15 years, the Southern scientific center of RAS carried out sea expeditions in the south of Russia. The year of 2017 was marked as a 10-year anniversary of the first expedition of the R/V Deneb in the Azov and Black seas. During a five-year period from 2012 to 2016, 36 complex expeditions in the Azov and Black seas were carried out by R/V Deneb; the oceanographic database was enriched with the data of 3500 oceanological stations, more than 11,000 samplings were done at more than 900 complex hydrobiological stations. The expeditionary materials enlarged the oceanographic database of the Southern scientific center: the field and archival data permitted to assess long-term dynamics of organic matter and carbon, the Azov Sea transparency and salinity and to calculate the characteristics of small-scale variability of temperature, salinity, internal waves and level fluctuations in the Azov and Black seas. The research in the Black Sea provided extensive synchronous data which characterize current state of the most vulnerable psammophilic benthic communities at the depths of 2-20 m. The estuaries of small rivers at their junction with the sea were studied in details. The new data on distribution and quantitative characteristics of jelly-like-, phyto-and pico-plankton over the whole shelf area of the Russian sector of the Black Sea is obtained. The Black Sea population of newcomers -Holland crabs (Rhitropanopaeus harrisi tridentate) -living exclusively in the sea canyons with unstable salinity was studied. The metagenomic approaches applied to study the plankton communities in the Azov and Black seas, were used to obtain new data on diversity and structure of marine bacterial communities. The oceanological observation data on the environment conditions in the Azov and Black seas are annually directed to the Hydrographic department of the Black Sea Navy of Russian Federation where it is used in the field service.

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“…The increase of particles in the water column causes light attenuation and decreases the water transparency (James et al, 2004;Sorokina and Kulygin, 2013). Accompanying sediment resuspension are an enhanced exchange between the porewater and overlying water and the adsorption and desorption of resuspended particles, factors that influence phosphorus and nitrogen cycling across the sediment-water interface (You et al, 2007b;de Vicente et al, 2010;Kalnejais et al, 2010;Couceiro et al, 2013;Tammeorg et al, 2013).…”

Section: Introductionmentioning

confidence: 99%

The role of tubificid worms (Limnodrilus hoffmeisteri) in sediment resuspension: a microcosm study

Zhang

Shang

et al. 2014

Ann. Limnol. - Int. J. Lim.

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-Sediment resuspension is an important internal lake process in regulating nutrient cycling and ecosystem structure. Tubificid worms are widely and abundantly distributed in freshwater ecosystems and are able to alter the sediment characteristics. This study was conducted to verify the hypothesis that the alteration of sediments by tubificids may substantially influence the sediment resuspension process. Specifically, we investigated the influence of Limnodrilus hoffmeisteri (Tubificidae) on sediment resuspension using an apparatus designed to simulate the sediment resuspension process in Lake Taihu (China). We examined L. hoffmeisteri according to its density (30 000 ind.m x2 ) in Lake Taihu and simulated the light ) wind processes present in Lake Taihu. Tubificids loosened the sediment through their feeding and defecation activities and increased the sediment water content. The appearance of tubificids increased the suspended solids (SS) in a 1.6 m water column under all three wind processes. During the sedimentation process, SS decreased rapidly in both the control and tubificid treatments. The total SS in the water column was significantly increased by tubificids and it changed significantly with time. In addition, the small size particles of the SS in the tubificid treatment were higher than that in the control. So, the appearance of tubificid worms (L. hoffmeisteri) enhanced sediment resuspension and raised the proportion of small size particles in SS.

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Long-term variability of the water transparency (Secchi Depth) in the Sea of Azov

Cited by 5 publications

References 3 publications

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

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

Research Vessel Deneb: 10 Years of Marine Scientific Research

The role of tubificid worms (Limnodrilus hoffmeisteri) in sediment resuspension: a microcosm study

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