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dc.contributor.authorWallmann, Klaus
dc.contributor.authorRiedel, M.
dc.contributor.authorHong, Wei-Li
dc.contributor.authorPatton, Henry
dc.contributor.authorHubbard, Alun Lloyd
dc.contributor.authorPape, T.
dc.contributor.authorHsu, C.W.
dc.contributor.authorSchmidt, C.
dc.contributor.authorJohnson, Joel E.
dc.contributor.authorTorres, M.E.
dc.contributor.authorAndreassen, Karin
dc.contributor.authorBerndt, C.
dc.contributor.authorBohrmann, G
dc.date.accessioned2018-04-23T12:11:47Z
dc.date.available2018-04-23T12:11:47Z
dc.date.issued2018-01-08
dc.description.abstractMethane seepage from the upper continental slopes of Western Svalbard has previously been attributed to gas hydrate dissociation induced by anthropogenic warming of ambient bottom waters. Here we show that sediment cores drilled off Prins Karls Foreland contain freshwater from dissociating hydrates. However, our modeling indicates that the observed pore water freshening began around 8 ka BP when the rate of isostatic uplift outpaced eustatic sea-level rise. The resultant local shallowing and lowering of hydrostatic pressure forced gas hydrate dissociation and dissolved chloride depletions consistent with our geochemical analysis. Hence, we propose that hydrate dissociation was triggered by postglacial isostatic rebound rather than anthropogenic warming. Furthermore, we show that methane fluxes from dissociating hydrates were considerably smaller than present methane seepage rates implying that gas hydrates were not a major source of methane to the oceans, but rather acted as a dynamic seal, regulating methane release from deep geological reservoirs.en_US
dc.description.sponsorshipThe European COST action MIGRATE; The German SUGAR program; The DFG-Research Center/Cluster of Excellence “The Ocean in the Earth System” at Bremen University; The Cluster of Excellence “The Future Ocean” at Kiel University; NORCRUST project (project number 255150)en_US
dc.descriptionSource at: <a href=http://doi.org/10.1038/s41467-017-02550-9> http://doi.org/10.1038/s41467-017-02550-9 </a>en_US
dc.identifier.citationWallmann, K., Riedel, M., Hong, W-L., Patton, H., Hubbard, A. L., Pape, T., ... Bohrmann, G. (2018). Gas hydrate dissociation off Svalbard induced by isostatic rebound rather than global warming. Nature Communications, 9(83), 1-9. http://doi.org/10.1038/s41467-017-02550-9en_US
dc.identifier.cristinIDFRIDAID 1539649
dc.identifier.doi10.1038/s41467-017-02550-9
dc.identifier.issn2041-1723
dc.identifier.urihttps://hdl.handle.net/10037/12571
dc.language.isoengen_US
dc.publisherNature Publishing Groupen_US
dc.relation.journalNature Communications
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.subjectVDP::Matematikk og Naturvitenskap: 400::Geofag: 450::Andre geofag: 469en_US
dc.subjectVDP::Mathematics and natural science: 400::Geosciences: 450::Other geosciences: 469en_US
dc.titleGas hydrate dissociation off Svalbard induced by isostatic rebound rather than global warmingen_US
dc.typeJournal articleen_US
dc.typeTidsskriftartikkelen_US
dc.typePeer revieweden_US


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