Last major retreat of Antarctic ice sheets forced by sea level rise and ocean warming

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dc.contributor.authorMackintosh, ANen_AU
dc.contributor.authorDomack, Een_AU
dc.contributor.authorGolledge, NRen_AU
dc.contributor.authorDunbar, Ren_AU
dc.contributor.authorLeventer, Aen_AU
dc.contributor.authorWhite, Den_AU
dc.contributor.authorFink, Den_AU
dc.contributor.authorGore, DBen_AU
dc.contributor.authorLavoie, Cen_AU
dc.date.accessioned2010-10-25T03:44:46Zen_AU
dc.date.available2010-10-25T03:44:46Zen_AU
dc.date.issued2009-07-01en_AU
dc.date.statistics2009-07-01en_AU
dc.description.abstractThe retreat of Antarctic ice sheets during the transition from the last glacial period to the Holocene provides the most recent example of ice sheet response to major climate forcing and thus allows rates of ice sheet decay and coupling to sea level rise to be quantified. We observe through a combination of land- and marine-based geochronology and ice sheet modelling, a highly-resolved temporal record of deglaciation of the East Antarctic Ice Sheet across the Mac.Robertson Land shelf. Our reconstruction demonstrates that deglaciation of deep-shelf troughs and lowering of the ice sheet surface occurred in two phases, from 14 - 12 and 12 - 7 ka before present (BP). Our consideration of possible mechanisms for the observed retreat of the marine ice margin of Mac.Robertson Land favours rapid rates of eustatic sea level rise associated with Meltwater Pulse 1a (MWP-1a) at ~14 ka BP and warming of the marginal oceans and atmosphere to nearmodern levels ~2 ka later. In support of this interpretation is the comparison of our land-marine sequence to other well-constrained marine deglacial events from both West and East Antarctica, including the Ross and Weddell Sea embayments. Our results show that periods of rapid sea level rise can initiate instability in Antarctica’s ice masses, including the margins of East Antarctica, and indicate that a combination of sea level rise and oceanic warming is a powerful driver of ice retreat.en_AU
dc.identifier.booktitleProceedings of the Annual Antarctic Conference 2009en_AU
dc.identifier.citationMackintosh, A., Domack, E., Golledge, N., Dunbar, R., Leventer, A., White, D., Fink, D., Gore, D., & Lavoie, C. (2009). Last major retreat of Antarctic ice sheets forced by sea level rise and ocean warming. Annual Antarctic Conference 2009 - "Sustaining the Gains of the International Polar Year", 1st – 3rd July 2009. In Proceedings of the Annual Antarctic Conference 2009, (pp. 13). Auckland, New Zealand: University of Auckland.en_AU
dc.identifier.conferenceenddate3 July 2009en_AU
dc.identifier.conferencenameAnnual Antarctic Conference 2009 - 'Sustaining the Gains of the International Polar Year'en_AU
dc.identifier.conferenceplaceAuckland, New Zealanden_AU
dc.identifier.conferencestartdate1 July 2009en_AU
dc.identifier.govdoc2924en_AU
dc.identifier.issn1176-5798en_AU
dc.identifier.pagination13en_AU
dc.identifier.placeofpublicationAuckland, New Zealanden_AU
dc.identifier.urihttp://apo.ansto.gov.au/dspace/handle/10238/2745en_AU
dc.language.isoenen_AU
dc.publisherUniversity of Aucklanden_AU
dc.subjectAntarcticaen_AU
dc.subjectIceen_AU
dc.subjectQuaternary perioden_AU
dc.subjectSea levelen_AU
dc.subjectGreenhouse effecten_AU
dc.subjectClimatic changeen_AU
dc.titleLast major retreat of Antarctic ice sheets forced by sea level rise and ocean warmingen_AU
dc.typeConference Presentationen_AU
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