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dc.contributor.authorKajanto, Karita Anneli
dc.contributor.authorSeroussi, Hélène
dc.contributor.authorde Fleurian, Basile
dc.contributor.authorNisancioglu, Kerim Hestnes
dc.description.abstractMarine terminating glaciers evolve on millenial timescales in response to changes in oceanic and atmospheric conditions. However, the relative role of oceanic and atmospheric drivers remains uncertain. The evolution of marine terminating glaciers under the warmer than present Holocene Climate Optimum climate can give important insights into the dynamics of ice streams as the climate evolves. The early Holocene evolution of Jakobshavn Isbræ, from the Last Glacial Maximum extent up to 8.2 ka BP is well constrained by geomorphological studies in the area. However, the Holocene minimum extent of the glacier is unknown. Here, we use a high-resolution regional ice sheet model to study the retreat and readvance of Jakobshavn Isbræ from the Mid-Holocene to the Little Ice Age. This model of Jakobshavn Isbræ accurately tracks the terrestrial ice margin and agrees with available estimates of marine grounding line evolution. We find that the Holocene minimum extent of both the terrestrial ice margin and the grounding line, reached at 6–5 ka BP, is close to the present day extent of the glacier. We also find that the glacier is currently located close to a tipping point, from beyond which readvance would require a longer and more significant cooling than the Little Ice Age. We assess the importance of the ocean forcing in explaining the Holocene evolution of Jakobshavn, and find that cooling within the fjord during the Mid-Holocene is critical for the glacier to readvance. This finding emphasizes the role of ocean forcing when trying to understand the millenial scale evolution of marine terminating glaciers.en_US
dc.rightsNavngivelse 4.0 Internasjonal*
dc.titlePresent day Jakobshavn Isbræ close to the Holocene minimum extenten_US
dc.typeJournal articleen_US
dc.typePeer revieweden_US
dc.rights.holderCopyright 2020 The Author(s).en_US
dc.source.journalQuaternary Science Reviewsen_US
dc.relation.projectNotur/NorStore: NN4659Ken_US
dc.relation.projectNorges forskningsråd: 246929en_US
dc.identifier.citationQuaternary Science Reviews. 2020, 246, 106492.en_US

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Navngivelse 4.0 Internasjonal
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