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Open AccessArticle

The Impact of Methane Seepage on the Pore-Water Geochemistry across the East Siberian Arctic Shelf

1
School of Earth Sciences and Engineering, Tomsk Polytechnic University, 634050 Tomsk, Russia
2
Norwegian Institute of Water Research, 0345 Oslo, Norway
3
Shirshov Institute of Oceanology, Russian Academy of Sciences, 117218 Moscow, Russia
4
Pacific Oceanological Institute, Far East Branch of Russian Academy of Sciences, 690041 Vladivostok, Russia
*
Author to whom correspondence should be addressed.
Academic Editor: Alexander Yakirevich
Water 2021, 13(4), 397; https://doi.org/10.3390/w13040397
Received: 31 December 2020 / Revised: 23 January 2021 / Accepted: 25 January 2021 / Published: 4 February 2021
(This article belongs to the Section Aquatic Systems—Quality and Contamination)
East Siberian Arctic Shelf, the widest and the shallowest shelf of the World Ocean, covering greater than two million square kilometers, has recently been shown to be a significant modern source of atmospheric methane (CH4). The CH4 emitted to the water column could result from modern methanogenesis processes and/or could originate from seabed deposits (pre-formed CH4 preserved as free gas and/or gas hydrates). This paper focuses primarily on understanding the source and transformation of geofluid in the methane seepage areas using ions/trace elements and element ratios in the sediment pore-water. Six piston cores and totally 42 pore-water samples were collected in the East Siberian Sea and the Laptev Sea at water depths ranging from 22 to 68 m. In the active zones of methane release, concentrations of vanadium, thorium, phosphorus, aluminum are increased, while concentrations of cobalt, iron, manganese, uranium, molybdenum, copper are generally low. The behavior of these elements is determined by biogeochemical processes occurring in the pore-waters at the methane seeps sites (sulfate reduction, anaerobic oxidation of methane, secondary precipitation of carbonates and sulfides). These processes affect the geochemical environment and, consequently, the species of these elements within the pore-waters and the processes of their redistribution in the corresponding water–rock system. View Full-Text
Keywords: pore-water; methane seep; trace elements; East Siberian Arctic Shelf; global warming pore-water; methane seep; trace elements; East Siberian Arctic Shelf; global warming
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MDPI and ACS Style

Guseva, N.; Moiseeva, Y.; Purgina, D.; Gershelis, E.; Yakushev, E.; Semiletov, I. The Impact of Methane Seepage on the Pore-Water Geochemistry across the East Siberian Arctic Shelf. Water 2021, 13, 397. https://doi.org/10.3390/w13040397

AMA Style

Guseva N, Moiseeva Y, Purgina D, Gershelis E, Yakushev E, Semiletov I. The Impact of Methane Seepage on the Pore-Water Geochemistry across the East Siberian Arctic Shelf. Water. 2021; 13(4):397. https://doi.org/10.3390/w13040397

Chicago/Turabian Style

Guseva, Natalia; Moiseeva, Yulia; Purgina, Darya; Gershelis, Elena; Yakushev, Evgeniy; Semiletov, Igor. 2021. "The Impact of Methane Seepage on the Pore-Water Geochemistry across the East Siberian Arctic Shelf" Water 13, no. 4: 397. https://doi.org/10.3390/w13040397

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