Dynamic simulations of potential methane release from East Siberian continental slope sediments

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dc.citation.firstpage872en_US
dc.citation.journalTitleGeochemistry, Geophysics, Geosystemsen_US
dc.citation.lastpage886en_US
dc.citation.volumeNumber17en_US
dc.contributor.authorStranne, C.en_US
dc.contributor.authorO’Regan, M.en_US
dc.contributor.authorDickens, G.R.en_US
dc.contributor.authorCrill, P.en_US
dc.contributor.authorMiller, C.en_US
dc.contributor.authorPreto, P.en_US
dc.contributor.authorJakobsson, M.en_US
dc.date.accessioned2017-05-03T19:58:19Zen_US
dc.date.available2017-05-03T19:58:19Zen_US
dc.date.issued2016en_US
dc.description.abstractSediments deposited along continental margins of the Arctic Ocean presumably host large amounts of methane (CH4) in gas hydrates. Here we apply numerical simulations to assess the potential of gas hydrate dissociation and methane release from the East Siberian slope over the next 100 years. Simulations are based on a hypothesized bottom water warming of 3°C, and an assumed starting distribution of gas hydrate. The simulation results show that gas hydrate dissociation in these sediments is relatively slow, and that CH4 fluxes toward the seafloor are limited by low sediment permeability. The latter is true even when sediment fractures are permitted to form in response to overpressure in pore space. With an initial gas hydrate distribution dictated by present-day pressure and temperature conditions, nominally 0.35 Gt of CH4 are released from the East Siberian slope during the first 100 years of the simulation. However, this CH4 discharge becomes significantly smaller (~0.05 Gt) if glacial sea level changes in the Arctic Ocean are considered. This is because a lower sea level during the last glacial maximum (LGM) must result in depleted gas hydrate abundance within the most sensitive region of the modern gas hydrate stability zone. Even if all released CH4 reached the atmosphere, the amount coming from East Siberian slopes would be trivial compared to present-day atmospheric CH4 inputs from other sources.en_US
dc.identifier.citationStranne, C., O’Regan, M., Dickens, G.R., et al.. "Dynamic simulations of potential methane release from East Siberian continental slope sediments." <i>Geochemistry, Geophysics, Geosystems,</i> 17, (2016) Wiley: 872-886. https://doi.org/10.1002/2015GC006119.en_US
dc.identifier.doihttps://doi.org/10.1002/2015GC006119en_US
dc.identifier.urihttps://hdl.handle.net/1911/94143en_US
dc.language.isoengen_US
dc.publisherWileyen_US
dc.rightsArticle is made available in accordance with the publisher's policy and may be subject to US copyright law. Please refer to the publisher's site for terms of use.en_US
dc.titleDynamic simulations of potential methane release from East Siberian continental slope sedimentsen_US
dc.typeJournal articleen_US
dc.type.dcmiTexten_US
dc.type.publicationpublisher versionen_US
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