Unglaciated areas in East Antarctica during the last glacial (marine isotope stage 3) – new evidence from Rauer Group

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dc.contributor.authorBerg, Sen_AU
dc.contributor.authorWhite, DAen_AU
dc.contributor.authorBennike, Oen_AU
dc.contributor.authorFülöp, RHen_AU
dc.contributor.authorFink, Den_AU
dc.contributor.authorWagner, Ben_AU
dc.contributor.authorMelles, Men_AU
dc.date.accessioned2016-10-24T05:41:52Zen_AU
dc.date.available2016-10-24T05:41:52Zen_AU
dc.date.issued2016-12-01en_AU
dc.date.statistics2016-10-24en_AU
dc.description.abstractLimited information on the East Antarctic Ice Sheet (EAIS) geometry during Marine Isotope Stage 3 (MIS 3; 60-25 ka) restricts our understanding of its behaviour during periods of climate and sea level change. Ice sheet models forced by global parameters suggest an expanded EAIS compared to the Holocene during MIS 3, but field evidence from East Antarctic coastal areas contradicts such modelling, and suggests that the ice sheet margins were no more advanced than at present. Here we present a new lake sediment record, and cosmogenic exposure results from bedrock, which confirm that Rauer Group (eastern Prydz Bay) was ice-free for much of MIS 3. We also refine the likely duration of the Last Glacial Maximum (LGM) glaciation in the region. Lacustrine and marine sediments from Rauer Group indicate the penultimate period of ice retreat predates 50 ka. The lacustrine record indicates a change from warmer/wetter conditions to cooler/drier conditions after ca. 35 ka. Substantive ice sheet re-advance, however, may not have occurred until much closer to 20 ka. Contemporary coastal areas were still connected to the sea during MIS 3, restricting the possible extent of grounded ice in Prydz Bay on the continental shelf. In contrast, relative sea levels (RSL) deduced from field evidence indicate an extra ice load averaging several hundred metres thicker ice across the Bay between 45 and 32 ka. Thus, ice must either have been thicker immediately inland (with a steeper ice profile), or there were additional ice domes on the shallow banks of the outer continental shelf. Further work is required to reconcile the differences between empirical evidence of past ice sheet histories, and the history predicted by ice sheet models from far-field temperature and sea level records. © 2016, Elsevier Ltd.en_AU
dc.identifier.citationBerg, S., White, D. A., Bennike, O., Fülöp, R. H., Fink, D., Wagner, B., & Melles, M. (2016). Unglaciated areas in East Antarctica during the last glacial (marine isotope stage 3) – new evidence from Rauer Group. Quaternary Science Reviews, 153, 1-10. doi:10.1016/j.quascirev.2016.08.021en_AU
dc.identifier.govdoc7384en_AU
dc.identifier.issn0277-3791en_AU
dc.identifier.journaltitleQuaternary Science Reviewsen_AU
dc.identifier.pagination1-10en_AU
dc.identifier.urihttp://dx.doi.org/10.1016/j.quascirev.2016.08.021en_AU
dc.identifier.urihttp://apo.ansto.gov.au/dspace/handle/10238/7860en_AU
dc.identifier.volume153en_AU
dc.language.isoenen_AU
dc.publisherElsevieren_AU
dc.subjectGlaciersen_AU
dc.subjectAntarcticaen_AU
dc.subjectIsotopesen_AU
dc.subjectIceen_AU
dc.subjectLakesen_AU
dc.subjectSedimentsen_AU
dc.titleUnglaciated areas in East Antarctica during the last glacial (marine isotope stage 3) – new evidence from Rauer Groupen_AU
dc.typeJournal Articleen_AU
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