Respiration and biochemical composition of sedimenting organic matter during summer in the Barents Sea

Hydrocarbons in water, suspended matter and bottom sediments of the Barents Sea were studied based on materials from expeditions to the RV Akademik Mstislav Keldysh in 2016–2019. It is shown that at present there is no oil pollution in open areas of the Barents Sea. With the transition from early summer (2019) to autumn (2016), there was a decrease in hydrocarbon concentrations in surface waters, caused by a change in the biochemical composition of organic matter (possibly due to a decrease in the area of ice). With depth, the HC content decreased mainly. An exception was observed in the area of gutters and deposits, where in the bottom nepheloid layers there was an increase in the concentration of hydrocarbons in suspension and in the surface layer of bottom sediments, and in the thickness of the sediments there was no dependence on their distribution and organic carbon.

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Virio- and bacterioplankton of the Barents Sea in the autumn

Transaction Kola Science Cetnre ◽

10.37614/2307-5252.2021.3.9.006 ◽

2021 ◽

Vol 12 (3-2021) ◽

pp. 45-53

Author(s):

M.P. Venger ◽

Keyword(s):

Organic Matter ◽

Barents Sea ◽

The Arctic ◽

Quantitative Composition ◽

Autumn Period ◽

Late Autumn ◽

The Barents Sea ◽

Cell Volumes

In the autumn period 2011, 2015 in the waters of the Barents Sea, the communities of viruses and bacteria were studied, their quantitative composition was determined, and the nature of their distribution was studied. It was shown that the distribution of both virio- and bacterioplankton had pronounced zoning presumably due to increased concentrations of organic matter in more productive coastal and Atlantic waters compared to the Arctic. In September 2011, the number of viruses varied from 0.6 to 46.7 million particles/ml, exceeding the abundance of bacteria by 5 times an average. The quantity of bacterioplankton varied within 0.3–2.9 million cells/ml, biomass – 4.1–35.1 mg C/m3, with a range of mean cell volumes of 0.030–0.115 μm3. In November–December 2015, the abundance of viruses was 0.3–6.4 million particles/ml and quantitatively exceeded their bacterial hosts by 18 times an average. The quantity and biomass of bacteria varied within 0.02–0.3 million cells/ml and 0.3–2.7 mg C/m3, with a range of mean cell volumes of 0.013–0.068 μm3. It was found that the level of development of virio- and bacterioplankton significantly decreased by the late autumn period.

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Biogeochemical processes in the Barents sea

10.29006/978-5-6045110-0-8/(23) ◽

2021 ◽

pp. 287-306

Author(s):

A.Yu. Lein ◽

◽

A.S. Savvichev ◽

Keyword(s):

Organic Matter ◽

Water Column ◽

Methane Concentration ◽

Barents Sea ◽

Biogeochemical Processes ◽

Total Abundance ◽

The North ◽

The Barents Sea ◽

Continental Origin ◽

Biomass Of Microorganisms

Biogeochemical processes involving microorganisms play an important role in marine sedimentogenesis. The study of biogeochemical processes in the Barents Sea was carried out from 1997 with interruptions until 2019. Using a complex of geological-geochemical, microbiological, radioisotope and stable isotope methods, it was possible to obtain a quantitative estimate of the total abundance and biomass of microorganisms, rates of biogeochemical processes, methane content and organic matter suspended. In the course of work in four expeditions, it was found that in the surface (0–10 m) water column south of 74° N the magnitude of the total abundance and the biomass of microorganisms increased by 2019 by about 5 times compared to 1998. To the north, in colder waters, the total abundance and the biomass of organisms were lower than in the southern region of the sea. The methane concentration in the surface layer of the water column at the border with the atmosphere did not change much for 20 years (1976–1997) and increased noticeably from 1997 to 2017, from 3.3 to 15.8 nM. The increase in FFM, the biomass of organisms and the concentration of methane in the water column is associated with the melting of glaciers, with the release of organic matter of continental origin released from ice into the water. The results of the work indicate changes in the ecosystem of the Barents Sea.

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Organic matter and its transformation rates in different sea ecosystems

10.29006/978-5-6045110-0-8/(17) ◽

2021 ◽

pp. 212-235

Author(s):

A.I. Agatova ◽

◽

N.M. Lapina ◽

N.I. Torgunova ◽

K.V. Kodryan ◽

...

Keyword(s):

Organic Matter ◽

Particulate Organic Matter ◽

High Latitude ◽

Barents Sea ◽

Qualitative Composition ◽

Large Variability ◽

Deep Waters ◽

The Barents Sea ◽

Oil Hydrocarbons ◽

Significant Intensification

The article includes proprietary data and data from literature from the last 30 years about the fluctuations in concentration and the elemental and biochemical make-up of the dissolved and particulate organic matter (DOM and POM, respectively) in the different ecosystems of the Barents Sea. The large variability of these values in both surface and deep waters is shown, depending on the intensity of the hydrological and biological processes.DOM concentrations varied from 59 to 664 μMCorg, while POM varied from 0.25 to 38.08 μMCorg. The reduction of the ice cover affected both the distribution and the qualitative composition of the DOM and the POM. This reduction, as well as the increased flow of Atlantic waters, contributed not only to an increase in the primary production of organic matter, but also to a significant intensification of redox and hydrolytic processes of its transformation, especially in the high-latitude part of the Barents Sea. The DOM of the sea is characterized by high C / P ratios, far exceeding those of Redfeld. At the same time, C / N ratios in the most productive waters are close to those of Redfeld. We highlighted four regions in the sea where concentrations of dissolved carbohydrates increase towards the bottom, which indicates that oil hydrocarbons are supplied here.

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MOLECULAR GEOCHEMISTRY OF ORGANIC MATTER OF TRIASSIC ROCKS IN THE NORTHEASTERN PART OF THE BARENTS SEA: THE INFLUENCE OF TECTONIC AND MAGMATIC PROCESSES

Геология и геофизика ◽

10.15372/gig20170305 ◽

2017 ◽

Keyword(s):

Organic Matter ◽

Barents Sea ◽

Northeastern Part ◽

The Barents Sea ◽

Magmatic Processes

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Pelagic and sympagic contribution of organic matter to zooplankton and vertical export in the Barents Sea marginal ice zone

Deep Sea Research Part II Topical Studies in Oceanography ◽

10.1016/j.dsr2.2008.05.019 ◽

2008 ◽

Vol 55 (20-21) ◽

pp. 2330-2339 ◽

Cited By ~ 60

Author(s):

Tobias Tamelander ◽

Marit Reigstad ◽

Haakon Hop ◽

Michael L. Carroll ◽

Paul Wassmann

Keyword(s):

Organic Matter ◽

Barents Sea ◽

The Barents Sea ◽

Marginal Ice Zone ◽

Vertical Export

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Zooplankton the Barents Sea

10.29006/978-5-6045110-0-8/(26) ◽

2021 ◽

pp. 331-351

Author(s):

E.G. Arashkevich ◽

Keyword(s):

Organic Matter ◽

Barents Sea ◽

Vertical Flux ◽

Published Data ◽

Warming Climate ◽

The Barents Sea ◽

Barents Sea Ecosystem

A review of the published data on the distribution of biomass of zooplankton and its main groups: mesozooplankton, meroplankton, crustacean macrozooplankton and gelatinous macrozooplankton in the Barents Sea is presented. The factors that determine the amplitude and direction of interannual changes in the abundance of zooplankton are considered. The results of studies on the role of zooplankton in biotransformation and vertical flux of organic matter are presented. The data on the possible effect of warming climate on the Barents Sea ecosystem is analyzed.

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Molecular geochemistry of organic matter of Triassic rocks in the northeastern part of the Barents Sea: the influence of tectonic and magmatic processes

Russian Geology and Geophysics ◽

10.1016/j.rgg.2016.09.008 ◽

2017 ◽

Vol 58 (3-4) ◽

pp. 322-331

Author(s):

V.I. Petrova ◽

G.I. Batova ◽

A.V. Kursheva ◽

I.V. Litvinenko ◽

I.P. Morgunova

Keyword(s):

Organic Matter ◽

Barents Sea ◽

Northeastern Part ◽

The Barents Sea ◽

Magmatic Processes

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Benthic phosphorus cycling within the Eurasian marginal sea ice zone

Philosophical Transactions of The Royal Society A Mathematical Physical and Engineering Sciences ◽

10.1098/rsta.2019.0358 ◽

2020 ◽

Vol 378 (2181) ◽

pp. 20190358 ◽

Cited By ~ 1

Author(s):

Allyson Tessin ◽

Christian März ◽

Monika Kędra ◽

Jens Matthiessen ◽

Nathalie Morata ◽

...

Keyword(s):

Organic Matter ◽

Arctic Ocean ◽

Ocean Circulation ◽

Barents Sea ◽

The Arctic ◽

Near Surface ◽

The Barents Sea ◽

Fresh Organic Matter ◽

The Arctic Ocean ◽

Yermak Plateau

The Arctic Ocean region is currently undergoing dramatic changes, which will likely alter the nutrient cycles that underpin Arctic marine ecosystems. Phosphate is a key limiting nutrient for marine life but gaps in our understanding of the Arctic phosphorus (P) cycle persist. In this study, we investigate the benthic burial and recycling of phosphorus using sediments and pore waters from the Eurasian Arctic margin, including the Barents Sea slope and the Yermak Plateau. Our results highlight that P is generally lost from sediments with depth during organic matter respiration. On the Yermak Plateau, remobilization of P results in a diffusive flux of P to the seafloor of between 96 and 261 µmol m −2 yr −1 . On the Barents Sea slope, diffusive fluxes of P are much larger (1736–2449 µmol m −2 yr −1 ), but these fluxes are into near-surface sediments rather than to the bottom waters. The difference in cycling on the Barents Sea slope is controlled by higher fluxes of fresh organic matter and active iron cycling. As changes in primary productivity, ocean circulation and glacial melt continue, benthic P cycling is likely to be altered with implications for P imported into the Arctic Ocean Basin. This article is part of the theme issue ‘The changing Arctic Ocean: consequences for biological communities, biogeochemical processes and ecosystem functioning’.

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