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Methane transport and sources in an Arctic deep-water cold seep offshore NW Svalbard (Vestnesa Ridge, 79°N)

Sauer, Simone and Hong, Wei-Li and Yao, Haoyi and Lepland, Aivo and Klug, Martin and Eichinger, Florian and Himmler, Tobias and Crémière, Antoine and Panieri, Giuliana and Schubert, Carsten J. and Knies, Jochen (2021) Methane transport and sources in an Arctic deep-water cold seep offshore NW Svalbard (Vestnesa Ridge, 79°N). Deep Sea Research Part 1, 167 . Art. No. 103430. ISSN 0967-0637.

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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‰.

Item Type:Article
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Sauer, Simone0000-0003-4383-389X
Himmler, Tobias0000-0001-8847-0266
Additional Information:© 2020 Elsevier Ltd. Received 7 July 2020, Revised 24 October 2020, Accepted 24 October 2020, Available online 29 October 2020. We would like to acknowledge the crew and chief scientist of cruise “G.O. Sars” cruise P1606, and the team handling the ROV Ægir. We are grateful to Serge Robert for support during CH₄ measurements and for δ¹³C-DIC measurements at EAWAG. We want to thank Jasmin Schönenberger and Tonu Martma for XRD and δ¹³C-carbonate analyses, respectively. Thanks to the constructive comments of the reviewers this manuscript was improved compared to previous versions. This study was funded by the Research Council of Norway through its Centres of Excellence funding scheme grant 287 no. 223259 (CAGE), and by the project Petromaks2 NORCRUST – Norwegian Margin Fluid Systems and Methane-derived Authigenic carbonate Crusts (project #255150). The authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper.
Funding AgencyGrant Number
Research Council of Norway223259
Research Council of Norway255150
Subject Keywords:Methane; Aqueous fluid advection; Pore water modelling; Microbial methanogenesis; Arctic cold seep
Record Number:CaltechAUTHORS:20210318-113550827
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Official Citation:Simone Sauer, Wei-Li Hong, Haoyi Yao, Aivo Lepland, Martin Klug, Florian Eichinger, Tobias Himmler, Antoine Crémière, Giuliana Panieri, Carsten J. Schubert, Jochen Knies, 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, Volume 167, 2021, 103430, ISSN 0967-0637, (
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:108484
Deposited By: Tony Diaz
Deposited On:19 Mar 2021 02:14
Last Modified:19 Mar 2021 02:14

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