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dc.contributor.authorWolff, Ingo W.
dc.contributor.authorGlasser, Neil F.
dc.contributor.authorHarrison, Stephan
dc.contributor.authorWood, Joanne Laura
dc.contributor.authorHubbard, Alun
dc.date.accessioned2023-08-10T08:54:28Z
dc.date.available2023-08-10T08:54:28Z
dc.date.issued2023-07-17
dc.description.abstractDuring the Last Glacial Maximum (LGM), the Patagonian Ice Sheet (PIS) was the largest Quaternary ice mass in the Southern Hemisphere outside of Antarctica. Although the margins of the LGM ice sheet are now well established through end-moraine mapping and dating, apart from a few modelling and empirical studies, there remains a lack of constraint on its thickness and three-dimensional configuration. Here, we provide a high-resolution steady-state model reconstruction of the PIS at its maximum - LGM - extent applied using Nye's perfect-plastic ice rheology. The yield-strength parameter for the perfect-plastic flow model was calibrated against independent empirical reconstructions of the Lago Pueyrredón Glacier, where the former vertical extent of this major outlet glacier is well constrained by cosmogenically-dated trimlines and lateral and end-moraine limits. Using this derived yield-strength parameter, the perfect-plastic model is then applied to multiple flowlines demarking each outlet across the entirety of the PIS in a GIS framework. Our results reveal that the area of the PIS was ∼504,500 km2 (±8.5%) with a corresponding modelled ice volume of ∼554,500 km3 (±10%), equivalent to ∼1.38 m (±10%) of eustatic sea-level lowering at the LGM. Maximum surface elevation was at least 3500m asl although the majority of the ice sheet surface was below 2500 m asl. We find that our ice sheet reconstruction is in good general agreement with previous estimates of net PIS volume derived from transient modelling studies. We attribute the slightly lower aspect-ratio of our ice sheet (and its concomitant 5% reduction in volume and sea-level equivalent) to the lower yield strength applied, based on more temperate and dynamic ice sheet conditionsen_US
dc.identifier.citationWolff, Glasser NF, Harrison S, Wood, Hubbard AL. A steady-state model reconstruction of the patagonian ice sheet during the last glacial maximum. Quaternary Science Advances. 2023;12en_US
dc.identifier.cristinIDFRIDAID 2163293
dc.identifier.doi10.1016/j.qsa.2023.100103
dc.identifier.issn2666-0334
dc.identifier.urihttps://hdl.handle.net/10037/29836
dc.language.isoengen_US
dc.publisherElsevieren_US
dc.relation.journalQuaternary Science Advances
dc.relation.projectIDNorges forskningsråd: 223259en_US
dc.relation.projectIDNorges forskningsråd: 332635en_US
dc.rights.accessRightsopenAccessen_US
dc.rights.holderCopyright 2023 The Author(s)en_US
dc.rights.urihttps://creativecommons.org/licenses/by-nc-nd/4.0en_US
dc.rightsAttribution-NonCommercial-NoDerivatives 4.0 International (CC BY-NC-ND 4.0)en_US
dc.titleA steady-state model reconstruction of the patagonian ice sheet during the last glacial maximumen_US
dc.type.versionpublishedVersionen_US
dc.typeJournal articleen_US
dc.typeTidsskriftartikkelen_US
dc.typePeer revieweden_US


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Attribution-NonCommercial-NoDerivatives 4.0 International (CC BY-NC-ND 4.0)
Med mindre det står noe annet, er denne innførselens lisens beskrevet som Attribution-NonCommercial-NoDerivatives 4.0 International (CC BY-NC-ND 4.0)