Biogeochemical Consequences of Nonvertical Methane Transport in Sediment Offshore Northwestern Svalbard

A site at the gas hydrate stability limit was investigated offshore northwestern Svalbard to study methane transport in sediment. The site was characterized by chemosynthetic communities (sulfur bacteria mats, tubeworms) and gas venting. Sediments were sampled with in situ porewater collectors and b...

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Published in:Journal of Geophysical Research: Biogeosciences
Main Authors: Treude, Tina, Krause, Stefan, Steinle, Lea, Burwicz, Ewa B., Hamdan, L.J., Niemann, Helge, Feseker, Tomas, Liebetrau, Volker, Krastel, Sebastian, Berndt, Christian
Format: Article in Journal/Newspaper
Language:English
Published: American Geophysical Union (AGU) 2020
Subjects:
Online Access:https://hdl.handle.net/10037/18330
https://doi.org/10.1029/2019JG005371
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spelling ftunivtroemsoe:oai:munin.uit.no:10037/18330 2023-05-15T14:27:53+02:00 Biogeochemical Consequences of Nonvertical Methane Transport in Sediment Offshore Northwestern Svalbard Treude, Tina Krause, Stefan Steinle, Lea Burwicz, Ewa B. Hamdan, L.J. Niemann, Helge Feseker, Tomas Liebetrau, Volker Krastel, Sebastian Berndt, Christian 2020-03-21 https://hdl.handle.net/10037/18330 https://doi.org/10.1029/2019JG005371 eng eng American Geophysical Union (AGU) Journal of Geophysical Research (JGR): Biogeosciences Norges forskningsråd: 223259 Andre: Alexander von Humboldt Foundation EU: EU COST Action PERGAMON. Grant Number: ESSEM 0902 Andre: Swiss National Science Foundation and Deutsche Forschungsgem info:eu-repo/grantAgreement/RCN/SFF/223259/Norway/Centre for Arctic Gas Hydrate, Environment and Climate/CAGE/ Treude T, Krause S, Steinle L, Burwicz EB, Hamdan, Niemann H, Feseker T, Liebetrau V, Krastel S, Berndt C. Biogeochemical Consequences of Nonvertical Methane Transport in Sediment Offshore Northwestern Svalbard. Journal of Geophysical Research (JGR): Biogeosciences. 2020;125(3) FRIDAID 1805106 doi:10.1029/2019JG005371 2169-8953 2169-8961 https://hdl.handle.net/10037/18330 openAccess ©2020. American Geophysical Union. All Rights Reserved. VDP::Mathematics and natural science: 400::Geosciences: 450 VDP::Matematikk og Naturvitenskap: 400::Geofag: 450 Journal article Tidsskriftartikkel Peer reviewed publishedVersion 2020 ftunivtroemsoe https://doi.org/10.1029/2019JG005371 2021-06-25T17:57:24Z A site at the gas hydrate stability limit was investigated offshore northwestern Svalbard to study methane transport in sediment. The site was characterized by chemosynthetic communities (sulfur bacteria mats, tubeworms) and gas venting. Sediments were sampled with in situ porewater collectors and by gravity coring followed by analyses of porewater constituents, sediment and carbonate geochemistry, and microbial activity, taxonomy, and lipid biomarkers. Sulfide and alkalinity concentrations showed concentration maxima in near‐surface sediments at the bacterial mat and deeper maxima at the gas vent site. Sediments at the periphery of the chemosynthetic field were characterized by two sulfate‐methane transition zones (SMTZs) at ~204 and 45 cm depth, where activity maxima of microbial anaerobic oxidation of methane (AOM) with sulfate were found. Amplicon sequencing and lipid biomarker indicate that AOM at the SMTZs was mediated by ANME‐1 archaea. A 1D numerical transport reaction model suggests that the deeper SMTZ‐1 formed on centennial scale by vertical advection of methane, while the shallower SMTZ‐2 could only be reproduced by nonvertical methane injections starting on decadal scale. Model results were supported by age distribution of authigenic carbonates, showing youngest carbonates within SMTZ‐2. We propose that nonvertical methane injection was induced by increasing blockage of vertical transport or formation of sediment fractures. Our study further suggests that the methanotrophic response to the nonvertical methane injection was commensurate with new methane supply. This finding provides new information about for the response time and efficiency of the benthic methane filter in environments with fluctuating methane transport. Article in Journal/Newspaper Arctic Svalbard University of Tromsø: Munin Open Research Archive Svalbard Journal of Geophysical Research: Biogeosciences 125 3
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
Treude, Tina
Krause, Stefan
Steinle, Lea
Burwicz, Ewa B.
Hamdan, L.J.
Niemann, Helge
Feseker, Tomas
Liebetrau, Volker
Krastel, Sebastian
Berndt, Christian
Biogeochemical Consequences of Nonvertical Methane Transport in Sediment Offshore Northwestern Svalbard
topic_facet VDP::Mathematics and natural science: 400::Geosciences: 450
VDP::Matematikk og Naturvitenskap: 400::Geofag: 450
description A site at the gas hydrate stability limit was investigated offshore northwestern Svalbard to study methane transport in sediment. The site was characterized by chemosynthetic communities (sulfur bacteria mats, tubeworms) and gas venting. Sediments were sampled with in situ porewater collectors and by gravity coring followed by analyses of porewater constituents, sediment and carbonate geochemistry, and microbial activity, taxonomy, and lipid biomarkers. Sulfide and alkalinity concentrations showed concentration maxima in near‐surface sediments at the bacterial mat and deeper maxima at the gas vent site. Sediments at the periphery of the chemosynthetic field were characterized by two sulfate‐methane transition zones (SMTZs) at ~204 and 45 cm depth, where activity maxima of microbial anaerobic oxidation of methane (AOM) with sulfate were found. Amplicon sequencing and lipid biomarker indicate that AOM at the SMTZs was mediated by ANME‐1 archaea. A 1D numerical transport reaction model suggests that the deeper SMTZ‐1 formed on centennial scale by vertical advection of methane, while the shallower SMTZ‐2 could only be reproduced by nonvertical methane injections starting on decadal scale. Model results were supported by age distribution of authigenic carbonates, showing youngest carbonates within SMTZ‐2. We propose that nonvertical methane injection was induced by increasing blockage of vertical transport or formation of sediment fractures. Our study further suggests that the methanotrophic response to the nonvertical methane injection was commensurate with new methane supply. This finding provides new information about for the response time and efficiency of the benthic methane filter in environments with fluctuating methane transport.
format Article in Journal/Newspaper
author Treude, Tina
Krause, Stefan
Steinle, Lea
Burwicz, Ewa B.
Hamdan, L.J.
Niemann, Helge
Feseker, Tomas
Liebetrau, Volker
Krastel, Sebastian
Berndt, Christian
author_facet Treude, Tina
Krause, Stefan
Steinle, Lea
Burwicz, Ewa B.
Hamdan, L.J.
Niemann, Helge
Feseker, Tomas
Liebetrau, Volker
Krastel, Sebastian
Berndt, Christian
author_sort Treude, Tina
title Biogeochemical Consequences of Nonvertical Methane Transport in Sediment Offshore Northwestern Svalbard
title_short Biogeochemical Consequences of Nonvertical Methane Transport in Sediment Offshore Northwestern Svalbard
title_full Biogeochemical Consequences of Nonvertical Methane Transport in Sediment Offshore Northwestern Svalbard
title_fullStr Biogeochemical Consequences of Nonvertical Methane Transport in Sediment Offshore Northwestern Svalbard
title_full_unstemmed Biogeochemical Consequences of Nonvertical Methane Transport in Sediment Offshore Northwestern Svalbard
title_sort biogeochemical consequences of nonvertical methane transport in sediment offshore northwestern svalbard
publisher American Geophysical Union (AGU)
publishDate 2020
url https://hdl.handle.net/10037/18330
https://doi.org/10.1029/2019JG005371
geographic Svalbard
geographic_facet Svalbard
genre Arctic
Svalbard
genre_facet Arctic
Svalbard
op_relation Journal of Geophysical Research (JGR): Biogeosciences
Norges forskningsråd: 223259
Andre: Alexander von Humboldt Foundation
EU: EU COST Action PERGAMON. Grant Number: ESSEM 0902
Andre: Swiss National Science Foundation and Deutsche Forschungsgem
info:eu-repo/grantAgreement/RCN/SFF/223259/Norway/Centre for Arctic Gas Hydrate, Environment and Climate/CAGE/
Treude T, Krause S, Steinle L, Burwicz EB, Hamdan, Niemann H, Feseker T, Liebetrau V, Krastel S, Berndt C. Biogeochemical Consequences of Nonvertical Methane Transport in Sediment Offshore Northwestern Svalbard. Journal of Geophysical Research (JGR): Biogeosciences. 2020;125(3)
FRIDAID 1805106
doi:10.1029/2019JG005371
2169-8953
2169-8961
https://hdl.handle.net/10037/18330
op_rights openAccess
©2020. American Geophysical Union. All Rights Reserved.
op_doi https://doi.org/10.1029/2019JG005371
container_title Journal of Geophysical Research: Biogeosciences
container_volume 125
container_issue 3
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