ORGANIC CARBON IN SURFACE SEDIMENTS OF LAPTEV SEA AND EAST SIBERIAN SEA: OBSERVATION OF PYROLYSIS DATA
Ongoing global warming accelerates release of relict terrigenous organic carbon from permafrost onto the Arctic shelf waters. When transported in the land-sea system, it can further be accumulated in bottom sediments in the shelf or deep-sea zone and undergo degradation and remineralization, which l...
Published in: | Bulletin of the Tomsk Polytechnic University Geo Assets Engineering |
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Language: | Russian |
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Tomsk Polytechnic University
2023
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Online Access: | https://doi.org/10.18799/24131830/2023/4/4082 https://doaj.org/article/d134971dcb0d4b6c8f05f2a3fc8b3f5d |
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ftdoajarticles:oai:doaj.org/article:d134971dcb0d4b6c8f05f2a3fc8b3f5d 2023-06-11T04:08:21+02:00 ORGANIC CARBON IN SURFACE SEDIMENTS OF LAPTEV SEA AND EAST SIBERIAN SEA: OBSERVATION OF PYROLYSIS DATA Elena V. Gershelis Alexey S. Ruban Denis V. Chernykh Natalina A. Poltavskaya Igor P. Semiletov 2023-04-01T00:00:00Z https://doi.org/10.18799/24131830/2023/4/4082 https://doaj.org/article/d134971dcb0d4b6c8f05f2a3fc8b3f5d RU rus Tomsk Polytechnic University http://izvestiya.tpu.ru/archive/article/view/4082/2939 https://doaj.org/toc/2500-1019 https://doaj.org/toc/2413-1830 doi:10.18799/24131830/2023/4/4082 2500-1019 2413-1830 https://doaj.org/article/d134971dcb0d4b6c8f05f2a3fc8b3f5d Известия Томского политехнического университета: Инжиниринг георесурсов, Vol 334, Iss 4, Pp 149-162 (2023) bottom sediments organic matter hydrocarbons organic carbon isotopic composition arctic laptev sea east siberian sea Engineering geology. Rock mechanics. Soil mechanics. Underground construction TA703-712 article 2023 ftdoajarticles https://doi.org/10.18799/24131830/2023/4/4082 2023-05-07T00:33:07Z Ongoing global warming accelerates release of relict terrigenous organic carbon from permafrost onto the Arctic shelf waters. When transported in the land-sea system, it can further be accumulated in bottom sediments in the shelf or deep-sea zone and undergo degradation and remineralization, which leads to critical environmental consequences. This study aims at assessing the sources and degradation degree of terrigenous organic matter in the surface sediments of the Eastern Arctic seas. Within this study, marine bottom sediments taken from the surface horizon (0–10 cm) were investigated. Sampling was carried out during the 2011–2019 marine research expeditions. Lateral consistency of hydrogen index values in modern marine sediments on the Eastern Arctic shelf (mainly in the Laptev Sea) is associated with the great contribution of heterogeneous biolabile terrestrial organic matter, in contrast to other Arctic waters, where growing hydrogen index values are associated with the consistently growing contribution of autochthonous organic matter with increasing distance from the coast. While considering the δ13C and HI/OI correlation, there are also significant deviations from the linear dependence which usually indicates a conservative marine geochemical regime. Sediments of the Buor-Khaya Bay are characterized by an increased HI/OI values in contrast to the deep-water sediments of the continental slope which shows lower hydrogen content and a higher proportion of oxygen-containing compounds, indicating a strong transformation of organic matter. These findings confirm a key role of terrigenous supply in specific biogeochemical conditions in the studied area and reveal that geochemical indicators of immature organic matter sources in the Eastern Arctic seas should be interpreted differently from other Arctic continental margins. Article in Journal/Newspaper Arctic East Siberian Sea Global warming laptev Laptev Sea permafrost Directory of Open Access Journals: DOAJ Articles Arctic Buor-Khaya ENVELOPE(127.803,127.803,72.287,72.287) East Siberian Sea ENVELOPE(166.000,166.000,74.000,74.000) Khaya ENVELOPE(135.167,135.167,60.567,60.567) Laptev Sea Bulletin of the Tomsk Polytechnic University Geo Assets Engineering 334 4 149 162 |
institution |
Open Polar |
collection |
Directory of Open Access Journals: DOAJ Articles |
op_collection_id |
ftdoajarticles |
language |
Russian |
topic |
bottom sediments organic matter hydrocarbons organic carbon isotopic composition arctic laptev sea east siberian sea Engineering geology. Rock mechanics. Soil mechanics. Underground construction TA703-712 |
spellingShingle |
bottom sediments organic matter hydrocarbons organic carbon isotopic composition arctic laptev sea east siberian sea Engineering geology. Rock mechanics. Soil mechanics. Underground construction TA703-712 Elena V. Gershelis Alexey S. Ruban Denis V. Chernykh Natalina A. Poltavskaya Igor P. Semiletov ORGANIC CARBON IN SURFACE SEDIMENTS OF LAPTEV SEA AND EAST SIBERIAN SEA: OBSERVATION OF PYROLYSIS DATA |
topic_facet |
bottom sediments organic matter hydrocarbons organic carbon isotopic composition arctic laptev sea east siberian sea Engineering geology. Rock mechanics. Soil mechanics. Underground construction TA703-712 |
description |
Ongoing global warming accelerates release of relict terrigenous organic carbon from permafrost onto the Arctic shelf waters. When transported in the land-sea system, it can further be accumulated in bottom sediments in the shelf or deep-sea zone and undergo degradation and remineralization, which leads to critical environmental consequences. This study aims at assessing the sources and degradation degree of terrigenous organic matter in the surface sediments of the Eastern Arctic seas. Within this study, marine bottom sediments taken from the surface horizon (0–10 cm) were investigated. Sampling was carried out during the 2011–2019 marine research expeditions. Lateral consistency of hydrogen index values in modern marine sediments on the Eastern Arctic shelf (mainly in the Laptev Sea) is associated with the great contribution of heterogeneous biolabile terrestrial organic matter, in contrast to other Arctic waters, where growing hydrogen index values are associated with the consistently growing contribution of autochthonous organic matter with increasing distance from the coast. While considering the δ13C and HI/OI correlation, there are also significant deviations from the linear dependence which usually indicates a conservative marine geochemical regime. Sediments of the Buor-Khaya Bay are characterized by an increased HI/OI values in contrast to the deep-water sediments of the continental slope which shows lower hydrogen content and a higher proportion of oxygen-containing compounds, indicating a strong transformation of organic matter. These findings confirm a key role of terrigenous supply in specific biogeochemical conditions in the studied area and reveal that geochemical indicators of immature organic matter sources in the Eastern Arctic seas should be interpreted differently from other Arctic continental margins. |
format |
Article in Journal/Newspaper |
author |
Elena V. Gershelis Alexey S. Ruban Denis V. Chernykh Natalina A. Poltavskaya Igor P. Semiletov |
author_facet |
Elena V. Gershelis Alexey S. Ruban Denis V. Chernykh Natalina A. Poltavskaya Igor P. Semiletov |
author_sort |
Elena V. Gershelis |
title |
ORGANIC CARBON IN SURFACE SEDIMENTS OF LAPTEV SEA AND EAST SIBERIAN SEA: OBSERVATION OF PYROLYSIS DATA |
title_short |
ORGANIC CARBON IN SURFACE SEDIMENTS OF LAPTEV SEA AND EAST SIBERIAN SEA: OBSERVATION OF PYROLYSIS DATA |
title_full |
ORGANIC CARBON IN SURFACE SEDIMENTS OF LAPTEV SEA AND EAST SIBERIAN SEA: OBSERVATION OF PYROLYSIS DATA |
title_fullStr |
ORGANIC CARBON IN SURFACE SEDIMENTS OF LAPTEV SEA AND EAST SIBERIAN SEA: OBSERVATION OF PYROLYSIS DATA |
title_full_unstemmed |
ORGANIC CARBON IN SURFACE SEDIMENTS OF LAPTEV SEA AND EAST SIBERIAN SEA: OBSERVATION OF PYROLYSIS DATA |
title_sort |
organic carbon in surface sediments of laptev sea and east siberian sea: observation of pyrolysis data |
publisher |
Tomsk Polytechnic University |
publishDate |
2023 |
url |
https://doi.org/10.18799/24131830/2023/4/4082 https://doaj.org/article/d134971dcb0d4b6c8f05f2a3fc8b3f5d |
long_lat |
ENVELOPE(127.803,127.803,72.287,72.287) ENVELOPE(166.000,166.000,74.000,74.000) ENVELOPE(135.167,135.167,60.567,60.567) |
geographic |
Arctic Buor-Khaya East Siberian Sea Khaya Laptev Sea |
geographic_facet |
Arctic Buor-Khaya East Siberian Sea Khaya Laptev Sea |
genre |
Arctic East Siberian Sea Global warming laptev Laptev Sea permafrost |
genre_facet |
Arctic East Siberian Sea Global warming laptev Laptev Sea permafrost |
op_source |
Известия Томского политехнического университета: Инжиниринг георесурсов, Vol 334, Iss 4, Pp 149-162 (2023) |
op_relation |
http://izvestiya.tpu.ru/archive/article/view/4082/2939 https://doaj.org/toc/2500-1019 https://doaj.org/toc/2413-1830 doi:10.18799/24131830/2023/4/4082 2500-1019 2413-1830 https://doaj.org/article/d134971dcb0d4b6c8f05f2a3fc8b3f5d |
op_doi |
https://doi.org/10.18799/24131830/2023/4/4082 |
container_title |
Bulletin of the Tomsk Polytechnic University Geo Assets Engineering |
container_volume |
334 |
container_issue |
4 |
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149 |
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