Methane transport and sources in an Arctic deep-water cold seep offshore NW Svalbard (Vestnesa Ridge, 79°N)
We investigate the uppermost 60 cm of sediment in active pockmarks of a deep-water methane seep site from Vestnesa Ridge offshore NW Svalbard. Using video guided core sampling with a remotely operated vehicle we collected push cores directly from bacterial mats within two active pockmarks, Lunde and...
Published in: | Deep Sea Research Part I: Oceanographic Research Papers |
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Online Access: | https://hdl.handle.net/10037/19784 https://doi.org/10.1016/j.dsr.2020.103430 |
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ftunivtroemsoe:oai:munin.uit.no:10037/19784 2023-05-15T14:27:27+02:00 Methane transport and sources in an Arctic deep-water cold seep offshore NW Svalbard (Vestnesa Ridge, 79°N) Sauer, Simone Hong, Wei-Li Yao, Haoyi Lepland, Aivo Klug, Martin Eichinger, Florian Himmler, Tobias Cremiere, Antoine Panieri, Giuliana Schubert, Carsten J. Knies, Jochen 2020-10-29 https://hdl.handle.net/10037/19784 https://doi.org/10.1016/j.dsr.2020.103430 eng eng Elsevier Deep Sea Research Part I: Oceanographic Research Papers Norges forskningsråd: 223259 Norges forskningsråd: 255150 Sauer S, Hong H, Yao H, Lepland A, Klug M, Eichinger F, Himmler T, Cremiere A, Panieri G, Schubert CJ, Knies J. Methane transport and sources in an Arctic deep-water cold seep offshore NW Svalbard (Vestnesa Ridge, 79°N). Deep Sea Research Part I: Oceanographic Research Papers. 2020(103430) FRIDAID 1845431 doi:10.1016/j.dsr.2020.103430 0967-0637 1879-0119 https://hdl.handle.net/10037/19784 embargoedAccess © 2020 Elsevier Ltd. All rights reserved. VDP::Mathematics and natural science: 400::Geosciences: 450 VDP::Matematikk og Naturvitenskap: 400::Geofag: 450 Journal article Tidsskriftartikkel Peer reviewed acceptedVersion 2020 ftunivtroemsoe https://doi.org/10.1016/j.dsr.2020.103430 2021-06-25T17:57:46Z We investigate the uppermost 60 cm of sediment in active pockmarks of a deep-water methane seep site from Vestnesa Ridge offshore NW Svalbard. Using video guided core sampling with a remotely operated vehicle we collected push cores directly from bacterial mats within two active pockmarks, Lunde and Lomvi. Pore water analyses show very shallow sulphate methane transition zones and transport-reaction modelling suggests a considerable amount of dissolved methane passing through the sediment water interface due to upwards advection of an aqueous fluid not previously reported from Vestnesa Ridge. In addition, we show that the amount of methane that bypasses the benthic methane filter greatly increases with higher aqueous fluid advection rate. Recent changes in methane flux are evident from lipid biomarker, seep carbonate, and δ13C-organic carbon profiles in both pockmarks. Hydrocarbons at this cold seep site are supplied both by deep thermogenic sources from below the gas hydrate stability zone but also to a significant degree by microbial methanogenesis which dominates the signature in our shallow sediment cores with δ13C–CH4 values as low as −77‰. Article in Journal/Newspaper Arctic Arctic Lomvi Svalbard Lunde University of Tromsø: Munin Open Research Archive Arctic Lunde ENVELOPE(50.467,50.467,-66.967,-66.967) Svalbard Deep Sea Research Part I: Oceanographic Research Papers 167 103430 |
institution |
Open Polar |
collection |
University of Tromsø: Munin Open Research Archive |
op_collection_id |
ftunivtroemsoe |
language |
English |
topic |
VDP::Mathematics and natural science: 400::Geosciences: 450 VDP::Matematikk og Naturvitenskap: 400::Geofag: 450 |
spellingShingle |
VDP::Mathematics and natural science: 400::Geosciences: 450 VDP::Matematikk og Naturvitenskap: 400::Geofag: 450 Sauer, Simone Hong, Wei-Li Yao, Haoyi Lepland, Aivo Klug, Martin Eichinger, Florian Himmler, Tobias Cremiere, Antoine Panieri, Giuliana Schubert, Carsten J. Knies, Jochen Methane transport and sources in an Arctic deep-water cold seep offshore NW Svalbard (Vestnesa Ridge, 79°N) |
topic_facet |
VDP::Mathematics and natural science: 400::Geosciences: 450 VDP::Matematikk og Naturvitenskap: 400::Geofag: 450 |
description |
We investigate the uppermost 60 cm of sediment in active pockmarks of a deep-water methane seep site from Vestnesa Ridge offshore NW Svalbard. Using video guided core sampling with a remotely operated vehicle we collected push cores directly from bacterial mats within two active pockmarks, Lunde and Lomvi. Pore water analyses show very shallow sulphate methane transition zones and transport-reaction modelling suggests a considerable amount of dissolved methane passing through the sediment water interface due to upwards advection of an aqueous fluid not previously reported from Vestnesa Ridge. In addition, we show that the amount of methane that bypasses the benthic methane filter greatly increases with higher aqueous fluid advection rate. Recent changes in methane flux are evident from lipid biomarker, seep carbonate, and δ13C-organic carbon profiles in both pockmarks. Hydrocarbons at this cold seep site are supplied both by deep thermogenic sources from below the gas hydrate stability zone but also to a significant degree by microbial methanogenesis which dominates the signature in our shallow sediment cores with δ13C–CH4 values as low as −77‰. |
format |
Article in Journal/Newspaper |
author |
Sauer, Simone Hong, Wei-Li Yao, Haoyi Lepland, Aivo Klug, Martin Eichinger, Florian Himmler, Tobias Cremiere, Antoine Panieri, Giuliana Schubert, Carsten J. Knies, Jochen |
author_facet |
Sauer, Simone Hong, Wei-Li Yao, Haoyi Lepland, Aivo Klug, Martin Eichinger, Florian Himmler, Tobias Cremiere, Antoine Panieri, Giuliana Schubert, Carsten J. Knies, Jochen |
author_sort |
Sauer, Simone |
title |
Methane transport and sources in an Arctic deep-water cold seep offshore NW Svalbard (Vestnesa Ridge, 79°N) |
title_short |
Methane transport and sources in an Arctic deep-water cold seep offshore NW Svalbard (Vestnesa Ridge, 79°N) |
title_full |
Methane transport and sources in an Arctic deep-water cold seep offshore NW Svalbard (Vestnesa Ridge, 79°N) |
title_fullStr |
Methane transport and sources in an Arctic deep-water cold seep offshore NW Svalbard (Vestnesa Ridge, 79°N) |
title_full_unstemmed |
Methane transport and sources in an Arctic deep-water cold seep offshore NW Svalbard (Vestnesa Ridge, 79°N) |
title_sort |
methane transport and sources in an arctic deep-water cold seep offshore nw svalbard (vestnesa ridge, 79°n) |
publisher |
Elsevier |
publishDate |
2020 |
url |
https://hdl.handle.net/10037/19784 https://doi.org/10.1016/j.dsr.2020.103430 |
long_lat |
ENVELOPE(50.467,50.467,-66.967,-66.967) |
geographic |
Arctic Lunde Svalbard |
geographic_facet |
Arctic Lunde Svalbard |
genre |
Arctic Arctic Lomvi Svalbard Lunde |
genre_facet |
Arctic Arctic Lomvi Svalbard Lunde |
op_relation |
Deep Sea Research Part I: Oceanographic Research Papers Norges forskningsråd: 223259 Norges forskningsråd: 255150 Sauer S, Hong H, Yao H, Lepland A, Klug M, Eichinger F, Himmler T, Cremiere A, Panieri G, Schubert CJ, Knies J. Methane transport and sources in an Arctic deep-water cold seep offshore NW Svalbard (Vestnesa Ridge, 79°N). Deep Sea Research Part I: Oceanographic Research Papers. 2020(103430) FRIDAID 1845431 doi:10.1016/j.dsr.2020.103430 0967-0637 1879-0119 https://hdl.handle.net/10037/19784 |
op_rights |
embargoedAccess © 2020 Elsevier Ltd. All rights reserved. |
op_doi |
https://doi.org/10.1016/j.dsr.2020.103430 |
container_title |
Deep Sea Research Part I: Oceanographic Research Papers |
container_volume |
167 |
container_start_page |
103430 |
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1766301197644333056 |