Ice surface lowering of Skelton Glacier, Transantarctic Mountains, since the Last Glacial Maximum: implications for retreat of grounded ice in the western Ross Sea

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dc.contributor.authorAnderson, JTHen_AU
dc.contributor.authorWilson, GSen_AU
dc.contributor.authorJones, RSen_AU
dc.contributor.authorFink, Den_AU
dc.contributor.authorFujioka, Ten_AU
dc.date.accessioned2021-12-16T22:07:54Zen_AU
dc.date.available2021-12-16T22:07:54Zen_AU
dc.date.issued2020-06-01en_AU
dc.date.statistics2021-11-22en_AU
dc.description.abstractQuantifying the contribution of the East Antarctic Ice Sheet (EAIS) to sea-level rise during the last deglaciation is complicated by the limited opportunities to constrain ice-sheet models. The nunatak, Escalade Peak, provides a gauge for past ice surface elevation changes and behaviour throughout the last glacial cycle. Geomorphological mapping, geological evidence and 10Be cosmogenic-nuclide exposure dating at Escalade Peak, provide new constraints on the ice surface history of the Skelton Névé since the Last Glacial Maximum (LGM). An elevation transect from the eastern margin of Escalade Peak indicates that the ice surface of the Skelton Névé was at least 50 m and perhaps >120 m higher than present during the LGM. In contrast, surface-exposure ages from a suite of inner moraines (blue-ice moraines) adjacent to Escalade Peak do not provide independent ice surface elevation constraints, but may provide an indirect constraint on the timing of thinning due to exhumation-ablation processes. Maximum simple exposure ages from the inner moraines suggest ice surface ablation was initiated by 19.2 ka, but the majority of ice surface lowering at Escalade Peak likely occurred after ∼15 ka and reached the present-day ice level at ∼6 ka. These findings suggest that slow flowing inland sites of EAIS outlet glaciers, such as southern Skelton Névé, experienced minimal ice surface elevation change since the LGM and record an EAIS outlet glacier and western Ross Sea retreat signature rather than widespread Ross Sea retreat. The ice surface lowering is likely to have been in response to retreat of the grounded ice in the western Ross Embayment causing a reduction in buttressing of the Skelton Glacier and draw down into the Ross Sea. © 2020 Elsevier Ltd.en_AU
dc.identifier.articlenumber106305en_AU
dc.identifier.citationAnderson, J. T. H., Wilson, G. S., Jones, R. S., Fink, D., Fujioka, T. (2020). Ice surface lowering of Skelton Glacier, Transantarctic Mountains, since the Last Glacial Maximum: implications for retreat of grounded ice in the western Ross Sea. Quaternary Science Reviews, 237, 106305. doi:10.1016/j.quascirev.2020.106305en_AU
dc.identifier.issn0277-3791en_AU
dc.identifier.journaltitleQuaternary Science Reviewsen_AU
dc.identifier.urihttps://doi.org/10.1016/j.quascirev.2020.106305en_AU
dc.identifier.urihttps://apo.ansto.gov.au/dspace/handle/10238/12515en_AU
dc.identifier.volume237en_AU
dc.language.isoenen_AU
dc.publisherElsevieren_AU
dc.subjectAntarcticaen_AU
dc.subjectQuaternary perioden_AU
dc.subjectGlaciersen_AU
dc.subjectIceen_AU
dc.subjectIsotopesen_AU
dc.subjectBeryllium 10en_AU
dc.subjectGeomorphologyen_AU
dc.subjectAge estimationen_AU
dc.titleIce surface lowering of Skelton Glacier, Transantarctic Mountains, since the Last Glacial Maximum: implications for retreat of grounded ice in the western Ross Seaen_AU
dc.typeJournal Articleen_AU
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