Retreat of the East Antarctic ice sheet during the last glacial termination

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dc.contributor.authorMackintosh, ANen_AU
dc.contributor.authorGolledge, NRen_AU
dc.contributor.authorDomack, Een_AU
dc.contributor.authorDunbar, Ren_AU
dc.contributor.authorLeventer, Aen_AU
dc.contributor.authorWhite, Den_AU
dc.contributor.authorPollard, Den_AU
dc.contributor.authorDeConto, Ren_AU
dc.contributor.authorFink, Den_AU
dc.contributor.authorZwartz, Den_AU
dc.contributor.authorGore, DBen_AU
dc.contributor.authorLavoie, Cen_AU
dc.date.accessioned2011-03-30T04:24:15Zen_AU
dc.date.available2011-03-30T04:24:15Zen_AU
dc.date.issued2011-03en_AU
dc.date.statistics2011-03en_AU
dc.description.abstractThe retreat of the East Antarctic ice sheet at the end of the last glacial period has been attributed to both sea-level rise and warming of the ocean at the margin of the ice sheet, but it has been challenging to test these hypotheses. Given the lack of constraints on the timing of retreat, it has been difficult to evaluate whether the East Antarctic ice sheet contributed to meltwater pulse 1a, an abrupt sea-level rise of approximately 20 m that occurred about 14,700 years ago. Here we use terrestrial exposure ages and marine sedimentological analyses to show that ice retreat in Mac. Robertson Land, East Antarctica, initiated about 14,000 years ago, became widespread about 12,000 years ago, and was completed by about 7,000 years ago. We use two models of different complexities to assess the forcing of the retreat. Our simulations suggest that, although the initial stage of retreat may have been forced by sea-level rise, the majority of the ice loss resulted from ocean warming at the onset of the Holocene epoch. In light of our age model we conclude that the East Antarctic ice sheet is unlikely to have been the source of meltwater pulse 1a, and, on the basis of our simulations, suggest that Antarctic ice sheets made an insignificant contribution to eustatic sea-level rise at this time. © 2011, Nature Publishing Group.en_AU
dc.identifier.articlenumber202en_AU
dc.identifier.citationMackintosh, A., Golledge, N., Domack, E., Dunbar, R., Leventer, A., White, D., Pollard, D., DeConto, R., Fink, D., Zwartz, D., Gore, D., & Lavoie, C. (2011). Retreat of the East Antarctic ice sheet during the last glacial termination. Nature Geoscience, 4(3), 195-202. doi:10.1038/NGEO1061en_AU
dc.identifier.govdoc3326en_AU
dc.identifier.issn1752-0894en_AU
dc.identifier.issue3en_AU
dc.identifier.journaltitleNature Geoscienceen_AU
dc.identifier.pagination195en_AU
dc.identifier.urihttp://dx.doi.org/10.1038/NGEO1061en_AU
dc.identifier.urihttp://apo.ansto.gov.au/dspace/handle/10238/3159en_AU
dc.identifier.volume4en_AU
dc.language.isoenen_AU
dc.publisherNature Publishing Groupen_AU
dc.subjectAntarcticaen_AU
dc.subjectIceen_AU
dc.subjectSea levelen_AU
dc.subjectQuaternary perioden_AU
dc.subjectGreenhouse effecten_AU
dc.subjectEnvironmental exposureen_AU
dc.titleRetreat of the East Antarctic ice sheet during the last glacial terminationen_AU
dc.typeJournal Articleen_AU
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