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dc.contributor.authorTreude, Tina
dc.contributor.authorKrause, Stefan
dc.contributor.authorSteinle, Lea
dc.contributor.authorBurwicz, Ewa B.
dc.contributor.authorHamdan, L.J.
dc.contributor.authorNiemann, Helge
dc.contributor.authorFeseker, Tomas
dc.contributor.authorLiebetrau, Volker
dc.contributor.authorKrastel, Sebastian
dc.contributor.authorBerndt, Christian
dc.date.accessioned2020-05-18T12:58:47Z
dc.date.available2020-05-18T12:58:47Z
dc.date.issued2020-03-21
dc.description.abstractA 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.en_US
dc.identifier.citationTreude 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)en_US
dc.identifier.cristinIDFRIDAID 1805106
dc.identifier.doi10.1029/2019JG005371
dc.identifier.issn2169-8953
dc.identifier.issn2169-8961
dc.identifier.urihttps://hdl.handle.net/10037/18330
dc.language.isoengen_US
dc.publisherAmerican Geophysical Union (AGU)en_US
dc.relation.journalJournal of Geophysical Research (JGR): Biogeosciences
dc.relation.projectIDNorges forskningsråd: 223259en_US
dc.relation.projectIDAndre: Alexander von Humboldt Foundationen_US
dc.relation.projectIDEU: EU COST Action PERGAMON. Grant Number: ESSEM 0902en_US
dc.relation.projectIDAndre: Swiss National Science Foundation and Deutsche Forschungsgemen_US
dc.relation.projectIDinfo:eu-repo/grantAgreement/RCN/SFF/223259/Norway/Centre for Arctic Gas Hydrate, Environment and Climate/CAGE/en_US
dc.rights.accessRightsopenAccessen_US
dc.rights.holder©2020. American Geophysical Union. All Rights Reserved.en_US
dc.subjectVDP::Mathematics and natural science: 400::Geosciences: 450en_US
dc.subjectVDP::Matematikk og Naturvitenskap: 400::Geofag: 450en_US
dc.titleBiogeochemical Consequences of Nonvertical Methane Transport in Sediment Offshore Northwestern Svalbarden_US
dc.type.versionpublishedVersionen_US
dc.typeJournal articleen_US
dc.typeTidsskriftartikkelen_US
dc.typePeer revieweden_US


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