Ecosystems of the Russian Arctic-2015 (63rd Cruise of the research vessel Akademik Mstislav Keldysh)

Флинт, М. В.; Poyarkov, S. G.; Rimsky-Korsakov, N. A.

doi:10.1134/s0001437016030061

Cited by 21 publications

(4 citation statements)

References 2 publications

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“…The data used in the study was obtained in scientific cruises held by SIO RAS to the Kara Sea in 1993, 2011(Lisitzin and Vinogradov 1994, Flint 2010, Flint and Poyarkov 2015, Flint et al 2016. Sites layout is shown on figure 1.…”

Section: Methodsmentioning

confidence: 99%

The role of river runoff in the Kara Sea surface layer acidification and carbonate system changes

Polukhin

2019

Environ. Res. Lett.

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This study aims to perform the results of the investigation of the Kara Sea carbonate system (CS) changes and the factors that determine it. The important feature of the Kara Sea water structure is strong stratification caused mainly by the Ob' and Yenisey rivers discharge which is estimated as 81% of the total continental runoff to sea. Occurring climate changes, as an increase in the total volume of the Arctic Ocean water (due to melting of glaciers, sea ice decline and river runoff increase), air temperature and CO 2 concentration growth should affect greatly the Kara Sea CS. However, riverine water influence seems to be the main driver of future acidification of the Kara Sea water due to permafrost thawing as it stores a great amount of buried carbon. An increase of carbon (mainly inorganic) flow to the sea will lead to carbonate equilibrium shift, oxidation of organic matter and release of CO 2 that ultimately leads to a decrease in pH and therefore acidification. The area of the riverine plume depends on the amount of freshwater flowing into the sea and the conditions of the wind forcing. According to the data from Shirshov Institute cruises within the plume area aragonite saturation is below 1 that shows its state as acidified. Prevalence of pCO 2 values in the freshened surface layer over the atmospheric shows that atmospheric carbon dioxide, apparently, cannot serve as the main driver for the acidification of the surface waters of the Kara Sea. At the shallow shelf to the north of the Ob′ Inlet mouth we observe acidification of the whole water column from surface to the bottom layer due to elevated riverine discharge and increase of flowing terrestrial carbon.

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Section: Methodsmentioning

confidence: 99%

The role of river runoff in the Kara Sea surface layer acidification and carbonate system changes

Polukhin

2019

Environ. Res. Lett.

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“…Carbonate crusts have been collected by the Sigsbee trawl from a depth of 63 m while studying the macrofauna within the area of active methane discharge in the Laptev Sea (Vedenin et al, 2020). Carbonates have been found approximately 50 km away from the C15 methane seep area (∼50 × 50 m, 76 • 46.34 N and 125 • 49.75 E, 71 m depth), which was investigated in 2015 (Flint et al, 2016;Kravchishina et al, 2017;Demina and Galkin, 2018;Savvichev et al, 2018a).…”

Section: Geological Settingmentioning

confidence: 99%

Methane-Derived Authigenic Carbonates on the Seafloor of the Laptev Sea Shelf

et al. 2021

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Seafloor authigenic carbonate crusts are widespread in various oceanic and marine settings, excluding high-latitude basins that are corrosive to carbonate precipitation. Newly formed carbonate formations are relatively rare in modern Arctic marine sediments. Although the first-order principles of seep carbonate formation are currently quite well constrained, little is known regarding the duration or mode of carbonate formation in the Siberian Arctic shelf. Large (massive slabs or blocks) and small crusts that were micrite cemented have been recently discovered on the seafloor of the Siberian Arctic seas within the area of known seep activity in the outer Laptev Sea shelf. Cold methane seeps were detected in the area due to the presence of an acoustic anomaly in the water column (gas flares). Microbial mats, methane gas bubbles, and carbonate crusts were observed using a towed camera platform. Here, we report new geochemical and mineralogical data on authigenic shallow Siberian Arctic cold-seep carbonate crusts to elucidate its genesis. The Laptev Sea carbonate crusts mainly consist of high-Mg calcite (up to 23 mol % MgCO3). The δ13C values in carbonates range significantly (from –40.1 to –25.9‰ VPDB), while the δ18O values vary in a narrow range (+4.4 ± 0.2‰ VPDB). The δ13C values of Corg that was determined from carbonates range from –40.2 to –31.1‰ VPDB. Using the isotope data and taking into account the geological setting, we consider that not only microbial but possibly thermogenic methane participated in the authigenic carbonate precipitation. Carbonate crust formation occurred below the water/sediment interface of the shallow Siberian Arctic shelf as a result of gas hydrate dissociation during Holocene warming events. The studied carbonate crusts were exhumated after precipitation into shallow subsurface shelf sediments.

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“…Many of the siboglinid findings in the seas of the Arctic basin were associated with high concentrations of hydrocarbons [52,53,74,76,97,99]. Recent studies have shown that Oligobrachia is a reliable indicator of methane seeps in the Laptev Sea [31,76,77,100]. Currently, only very few findings of frenulate siboglinid worms are available from the Kara Sea [52,53].…”

Section: General Connection Of Siboglinids Findings To Hydrocarbonsmentioning

confidence: 99%

Distribution of Nereilinum murmanicum (Annelida, Siboglinidae) in the Barents Sea in the Context of Its Oil and Gas Potential

Карасева

Kanafina

Ганцевич

et al. 2021

JMSE

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Frenulate siboglinids are a characteristic component of communities living in various reducing environments, including sites with hydrocarbon seeps. High concentrations of hydrocarbons in the sediments of the Arctic basin seas, including the Barents Sea, suggest the presence of a rich siboglinid fauna there. This reflects the fact that microbiological oxidation of methane occurs under reducing conditions, generating high concentrations of hydrogen sulfide in the sediment. This hydrogen sulfide acts as an energy source for the sulfide-oxidizing symbionts of siboglinids. Here we report on the findings of the frenulate siboglinid species Nereilinum murmanicum made between 1993 and 2020 in the Barents Sea. These data significantly expand the range of this species and yield new information on its habitat distribution. The depth range of N. murmanicum was 75–375 m. The species was most abundant from 200 to 350 m and was associated with temperatures below 3 °C and salinities from 34.42 to 35.07. Most of the findings (43 locations or 74%) fall on areas highly promising for oil and gas production. Twenty-eight locations (48%) are associated with areas of known oil deposits, 22 locations (37%) with explored areas of gas hydrate deposits. N. murmanicum was also found near the largest gas fields in the Barents Sea, namely Shtokman, Ludlovskoye and Ledovoye.

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Ecosystems of the Russian Arctic-2015 (63rd Cruise of the research vessel Akademik Mstislav Keldysh)

Cited by 21 publications

References 2 publications

The role of river runoff in the Kara Sea surface layer acidification and carbonate system changes

The role of river runoff in the Kara Sea surface layer acidification and carbonate system changes

Methane-Derived Authigenic Carbonates on the Seafloor of the Laptev Sea Shelf

Distribution of Nereilinum murmanicum (Annelida, Siboglinidae) in the Barents Sea in the Context of Its Oil and Gas Potential

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