scholarly journals Bottom sediments of the central and eastern parts of the Barents Sea: Ecotoxicological studies

Vestnik MGTU ◽  
2020 ◽  
Vol 23 (2) ◽  
pp. 122-130
Author(s):  
E. A. Gorbacheva
Keyword(s):  
Bottom Sediments ◽  
Barents Sea ◽  
Scientific Evidence ◽  
Analysis Data ◽  
Artemia Salina ◽  
Eastern Basin ◽  
Fine Grained ◽  
Novaya Zemlya ◽  
The Barents Sea ◽  
Sediment Elutriates

Bioassay is used to study bottom sediment ecotoxicity in the central and eastern parts of the Barents Sea. The effect of sediment elutriates on the growth of microalgae Phaedactylum tricornutum Bohlin and survival of brine shrimp Artemia salina L. larvae has been studied. As shown by scientific evidence, low and moderately toxic bottom sediments are present in the Eastern Basin, West Novaya Zemlya and South Novaya Zemlya troughs along with non-toxic bottom sediments, which may be indicative of accumulation of pollutants in these areas of the Barents Sea. Toxic bottom sediments have not been found in the sea areas adjacent to them. Reduced survival rate in sediment elutriates of low and moderate toxicity has been shown predominantly by A. salina larvae. Only one sediment elutriate from the South Novaya Zemlya trough has had a slight toxic effect on Ph. tricornutum. The amount of fine-grained fraction (> 0.063 mm) in bottom sediments classified as low and moderately toxic is 24.8-66.8 % and do not differ from its amount found in bottom sediments classified as non-toxic - 27.8-76.9 %. The findings obtained are consistent with published chemical analysis data according to which the Eastern Basin, West Novaya Zemlya and South Novaya Zemlya troughs are included in the Barents Sea areas having highest amounts of a number of pollutants in bottom sediments.

Co, Hf, Ce, Cr, Th, and REE systematics of modern bottom sediments of the Barents sea

2019 ◽  
Vol 485 (2) ◽  
pp. 207-211
Author(s):  
A. V. Maslov ◽  
N. V. Politova ◽  
V. P. Shevchenko ◽  
N. V. Kozina ◽  
A. N. Novigatsk ◽  
...  
Keyword(s):  
Bottom Sediments ◽  
Barents Sea ◽  
Western Coast ◽  
Novaya Zemlya ◽  
The North ◽  
The Barents Sea ◽  
Franz Josef Land ◽  
Pechora River ◽  
Marine Areas ◽  
Bottom Grab

The Co, Hf, Ce, Cr, Th, and REE systematics are analyzed for modern sediments collected by a bottom grab during the 67th and 68th cruises of R/V “Akademik Mstislav Keldysh” and samples taken in the Barents Sea bays and inlets. Our results indicate that most modern bottom sediments are composed of fine silicoclastic material enhanced with a suspended matter of the North Cape current, which erodes the western coast of Scandinavia, and due to bottom erosion of some marine areas, as well as erosion of rock complexes of the Kola Peninsula, Novaya Zemlya, and Franz Josef Land (local provenances). Material from Spitsbergen also probably played a certain role. In the southern part of the Barents Sea, clastic material is supplied by the Pechora River.

Rare and trace elements in modern bottom sediments of the Barents sea. Nd, Pb and Sr isotopic composition

2021 ◽  
pp. 444-472
Author(s):  
A.V. Maslov ◽  
◽  
N.V. Politova ◽  
N.V. Kozina ◽  
A.B. Kuznetzov ◽  
...  
Keyword(s):  
Bottom Sediments ◽  
Surface Sediments ◽  
Barents Sea ◽  
Positive Correlation ◽  
Novaya Zemlya ◽  
The North ◽  
The Barents Sea ◽  
Franz Josef Land ◽  
Central Regions ◽  
Moderate Positive Correlation

The article presents a brief lithological description of the modern bottom sediments of the Barents Sea, selected in the 67th voyage of the R/V “Akademik Mstislav Keldysh” at the polygons: 1) “Pechora Sea”; 2) “Western slope of Kaninskoe shoal”; 3) “Central Barents Sea (Shtokman area)”; 4) “Russkaya Gavan’ fjord”; 5) “Medvezhinsky Trench”; 6) in the area to the south of Spitsbergen; 7) “Kola meridian”; 8) “Spitsbergen – Franz Josef Land archipelago”; 9) “Cambridge Strait”. The distribution of Cr, Ni, Cu, Zn, Cd, and Pb in samples of bottom sediments (pelitic, aleurite-pelitic and sandy-aleuritic-pelitic ooze) is compared with the background concentrations and contents of these elements in the Post-Archean Average Shale (PAAS). The data obtained are consistent with the notion that the distribution of heavy metals and other elements in the bottom sediments is controlled primarily by the global geochemical background. The relationship of the Sc, V, Cr, Ni, Y, Zr, Nb, Mo, Hf, Th, U and rare-earth elements concentrations with content of fine pelite (< 0.001 mm) fraction and organic carbon (Corg) is considered. It was found that most of these elements are characterized by a moderate positive correlation with the amount of fine pelite fraction in samples. By the magnitude of the correlation coefficient with the Corg content, all elements are attributed into three groups: (1) with moderate positive correlation, (2) weak positive correlation, (3) practically not pronounced correlation. The distribution in the bottom sediments of the Barents Sea of the element-indicators of the source rocks composition (Sc, Th, Co, Cr, La and Sm), as well as of rare earths, make it possible to consider that the majority of bottom sediments is mature in geochemical terms material, the sources of which were rocks of the Kola Peninsula and Spitsbergen (?). The bottom sediments of the Cambridge Strait are represented by geochemically less mature material, which, apparently, entered the sea as a result of erosion of the Franz Josef Land archipelago rocks. The established isotopic characteristics (εNd, 207Pb/206Pb and 87Sr/86Sr) of 17 samples of surface sediments suggest that the main contribution to the formation of bottom deposits of the central regions of the Barents Sea is made by rocks of the mainland part located in the influence zone of the North Cape Current. Archipelagos and islands (Franz Josef Land, Novaya Zemlya, etc.) that frame the Barents Sea supply a relatively small amount of clastic material that is carried by Arctic currents. The values of εNd and 87Sr/86Sr in the surface sediments of the central part of the Barents Sea and in the ice-rafted sediments carried by the Transpolar Drift showed a significant difference. This suggests that the contribution of such material to the formation of surface sediments of the Barents Sea is relatively small

scholarly journals Features of the Hydrocarbon Distribution in the Bottom Sediments of the Norwegian and Barents Seas

Fluids ◽  
2021 ◽  
Vol 6 (12) ◽  
pp. 456
Author(s):  
Inna A. Nemirovskaya ◽  
Anastasia V. Khramtsova
Keyword(s):  
Bottom Sediments ◽  
Barents Sea ◽  
Size Composition ◽  
Geochemical Background ◽  
Svalbard Archipelago ◽  
Novaya Zemlya ◽  
The Barents Sea ◽  
Polycyclic Aromatic ◽  
Point Discharge ◽  
Hydrocarbon Distribution

The results of the study of hydrocarbons (HCs): aliphatic (AHCs) and polycyclic aromatic hydrocarbons (PAHs) in bottom sediments (2019 and 2020, cruises 75 and 80 of the R/V Akademik Mstislav Keldysh) in the Norwegian-Barents Sea basin: Mohns Ridge, shelf Svalbard archipelago, Sturfiord, Medvezhinsky trench, central part of the Barents Sea, Novaya Zemlya shelf, Franz Victoria trough are presented. It has been established that the organo-geochemical background of the Holocene sediments was formed due to the flow of sedimentary material in the coastal regions of the Barents Sea on shipping routes. The anthropogenic input of HCs into bottom sediments leads to an increase in their content in the composition of Corg (in the sandy sediments of the Kaninsky Bank at an AHC concentration up to 64 μg/g, when its proportion in the composition of Corg reaches 11.7%). The endogenous influence on the of the Svalbard archipelago shelf in Sturfiord and in the Medvezhinsky Trench determines the specificity of local anomalies in the content and composition of HCs. This is reflected in the absence of a correlation between HCs and the grain size composition of sediments and Corg content, as well as a change in hydrocarbon molecular markers. At the same time, the sedimentary section is enriched in light alkanes and naphthalene’s that may be due to emission during point discharge of gas fluid from sedimentary rocks of the lower stratigraphic horizons and/or sipping migration.

scholarly journals On the diversity of settlements of the bivalve mollusk Macoma calcarea (Bivalvia,Tellinidae) off the coast of Novaya Zemlya.

2020 ◽  
Vol 11 (5-2020) ◽  
pp. 116-125
Author(s):  
A.E. Noskovich ◽  
Keyword(s):  
High Mortality ◽  
Barents Sea ◽  
Bivalve Mollusk ◽  
Water Masses ◽  
High Biomass ◽  
Size Classes ◽  
Novaya Zemlya ◽  
The Barents Sea ◽  
Group I ◽  
Silty Soils

In the eastern part of the Barents Sea, there are 3 types of settlements of the bivalve mollusk Macoma calcarea. At low positive temperatures (from 0.6 to 1.3 оC),juveniles predominate on sandy-silty soils in settlements with low biomass, uneven growth and high mortality. In colder water masses (–0.4...–1.5 оC), M. calcareasettlements consist of long-lived, evenly growing large individuals that form high biomass values. In the settlement of group I, there was an increased elimination of certain size classes. The distribution of settlements depends little on the depth and salinity.

scholarly journals Assessment of initial seismic impacts on the northern part of the Barents Sea shelf (Novaya Zemlya region) for the purpose of seismic microzoning in the areas of prospective hydrocarbon mining

2019 ◽  
pp. 38-47
Author(s):  
I. G. Mindel ◽  
B. A. Trifonov ◽  
M. D. Kaurkin ◽  
V. V. Nesynov
Keyword(s):  
Oil And Gas ◽  
Barents Sea ◽  
Arctic Shelf ◽  
The Arctic ◽  
Russian Arctic ◽  
Seismic Microzoning ◽  
Novaya Zemlya ◽  
The Barents Sea ◽  
National Task ◽  
Seismic Impacts

In recent years, in connection with the national task of developing the Arctic territories of Russia and the perspective increase in the hydrocarbon mining on the Arctic shelf, more attention is being paid to the study of seismicity in the Barents Sea shelf. The development of the Russian Arctic shelf with the prospect of increasing hydrocarbon mining is a strategically important issue. Research by B.A. Assinovskaya (1990, 1994) and Ya.V. Konechnaya (2015) allowed the authors to estimate the seismic effects for the northern part of the Barents Sea shelf (Novaya Zemlya region). The paper presents the assessment results of the initial seismic impacts that can be used to solve seismic microzoning problems in the areas of oil and gas infrastructure during the economic development of the Arctic territory.

Features of Bitumoid Distribution in Bottom Sediments of the Barents Sea

Oceanology ◽  
2020 ◽  
Vol 60 (6) ◽  
pp. 831-839
Author(s):  
Yu. S. Glyaznetsova ◽  
I. A. Nemirovskaya
Keyword(s):  
Bottom Sediments ◽  
Barents Sea ◽  
The Barents Sea

Evaluation of the modern geoecological state of the fjords of the eastern Barents sea

2021 ◽  
pp. 899-943
Author(s):  
V.A. Shakhverdov ◽  
◽  
D.V. Ryabchuk ◽  
M.A. Spiridonov ◽  
V.A. Zhamoida ◽  
...  
Keyword(s):  
Bottom Sediments ◽  
Industrial Development ◽  
Barents Sea ◽  
Chemical Elements ◽  
Environmental Damage ◽  
North West ◽  
Geochemical Zoning ◽  
The North ◽  
The Barents Sea ◽  
Main Components

A brief analysis of the history of environmental geological study of the Barents Sea is given. It shows that at the beginning of industrial development the geological environment was characterized by a low level of disturbance and pollution. On example of the Kola Bay, an assessment of the current environmental geological conditions of the fjords in the eastern part of the Barents Sea is given. Seismic-acoustic studies confirm the predominantly tectonic origin of the bay and the hazardous spread of gravitational rocks movement within the coastal slopes. The background geochemical characteristics of recent bottom sediments are quantified. It is shown that geochemical zoning of the bottom of the bay is a consequence of both natural and anthropogenic processes. According to the content of Cu, Zn, As, Cd, Pb, Hg and hexane-soluble petroleum products (PP) in the bottom sediments, the characteristics of various areas were obtained. It is shown that the distribution of PP and several other pollutants in the main components of aquatic and coastal geosystems is a leading element of the environmental monitoring system, quantitative assessment of anthropogenic impact and accumulated environmental damage. Active economic activity within the southern leg of the Kola Bay, as well as the naval bases, significantly affects the distribution of chemical elements. The data concerning distribution of chemical elements forms in bottom sediments are given that suggest a high probability of secondary pollution of the bottom water when the physicochemical conditions of sedimentation processes change. A comparative analysis showed that bottom sediments of the Kola Bay are characterized by the highest concentration of chemical elements in the North-West Region of the Russian Federation.

scholarly journals Marine mammals' influence on ecosystem processes affecting fisheries in the Barents Sea is trivial

2009 ◽  
Vol 5 (2) ◽  
pp. 204-206 ◽  
Author(s):  
Peter J Corkeron
Keyword(s):  
Marine Mammal ◽  
Marine Mammals ◽  
Gadus Morhua ◽  
Fishery Management ◽  
Barents Sea ◽  
Scientific Evidence ◽  
Primary Component ◽  
Clupea Harengus ◽  
Balaenoptera Acutorostrata ◽  
The Barents Sea

Some interpretations of ecosystem-based fishery management include culling marine mammals as an integral component. The current Norwegian policy on marine mammal management is one example. Scientific support for this policy includes the Scenario Barents Sea (SBS) models. These modelled interactions between cod, Gadus morhua , herring, Clupea harengus , capelin, Mallotus villosus and northern minke whales, Balaenoptera acutorostrata . Adding harp seals Phoca groenlandica into this top-down modelling approach resulted in unrealistic model outputs. Another set of models of the Barents Sea fish–fisheries system focused on interactions within and between the three fish populations, fisheries and climate. These model key processes of the system successfully. Continuing calls to support the SBS models despite their failure suggest a belief that marine mammal predation must be a problem for fisheries. The best available scientific evidence provides no justification for marine mammal culls as a primary component of an ecosystem-based approach to managing the fisheries of the Barents Sea.

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