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dc.contributor.authorPortnov, Aleksei D
dc.contributor.authorMienert, Jurgen
dc.contributor.authorSerov, Pavel
dc.date.accessioned2022-08-31T09:17:05Z
dc.date.available2022-08-31T09:17:05Z
dc.date.issued2014-10-01
dc.description.abstractThawing subsea permafrost controls methane release from the Russian Arctic shelf having a considerable impact on the climate-sensitive Arctic environment. Expulsions of methane from shallow Russian Arctic shelf areas may continue to rise in response to intense degradation of relict subsea permafrost. Here we show modeling of the permafrost evolution from the Late Pleistocene to present time at the West Yamal shelf. Modeling results suggest a highly dynamic permafrost system that directly responds to even minor variations of lower and upper boundary conditions, e.g., geothermal heat flux from below and/or bottom water temperature changes from above permafrost. Scenarios of permafrost evolution show a potentially nearest landward modern extent of the permafrost at the West Yamal shelf limited by ~17 m isobaths, whereas its farthest seaward extent coincides with ~100 m isobaths. The model also predicts seaward tapering of relict permafrost with a maximal thickness of 275–390 m near the shoreline. Previous field observations detected extensive emissions of free gas into the water column at the transition zone between today's shallow water permafrost (<20 m) and deeper water nonpermafrost areas (>20 m). The model adapts well to corresponding heat flux and ocean temperature data, providing crucial information about the modern permafrost conditions. It shows current locations of upper and lower permafrost boundaries and evidences for possible release of methane from the seabed to the hydrosphere in a warming Arctic.en_US
dc.identifier.citationPortnov AD, Mienert J, Serov P. Modeling the evolution of climate-sensitive Arctic subsea permafrost in regions of extensive gas expulsion at the West Yamal shelf. Journal of Geophysical Research (JGR): Biogeosciences. 2014;119(11):2082-2094en_US
dc.identifier.cristinIDFRIDAID 1198367
dc.identifier.doi10.1002/2014JG002685
dc.identifier.issn2169-8953
dc.identifier.issn2169-8961
dc.identifier.urihttps://hdl.handle.net/10037/26501
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.rights.accessRightsopenAccessen_US
dc.rights.holderCopyright 2014 AGUen_US
dc.titleModeling the evolution of climate-sensitive Arctic subsea permafrost in regions of extensive gas expulsion at the West Yamal shelfen_US
dc.type.versionpublishedVersionen_US
dc.typeJournal articleen_US
dc.typeTidsskriftartikkelen_US
dc.typePeer revieweden_US


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