Unglaciated areas in East Antarctica during the Last Glacial (Marine Isotope Stage 3)–New evidence from Rauer Group
Limited 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 Holoc...
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ftansto:oai:apo-prod.ansto.gov.au:10238/7860 2023-05-15T13:36:16+02:00 Unglaciated areas in East Antarctica during the Last Glacial (Marine Isotope Stage 3)–New evidence from Rauer Group Berg, S White, DA Bennie, O Fülöp, R Fink, D Wagner, B Melles, M 2016-10-24 http://apo.ansto.gov.au/dspace/handle/10238/7860 https://doi.org/10.1016/j.quascirev.2016.08.021 en eng Elsevier Berg, 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.2016.08.021 0277-3791 http://dx.doi.org/10.1016/j.quascirev.2016.08.021 http://apo.ansto.gov.au/dspace/handle/10238/7860 Glaciers Antartica Isotopes Ice Lakes Sediments Journal Article 2016 ftansto https://doi.org/10.1016/j.quascirev.2016.08.021 2020-05-04T22:29:07Z Limited 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. Article in Journal/Newspaper Antarc* Antarctic Antarctica antartic* East Antarctica Ice Sheet Prydz Bay Australian Nuclear Science and Technology Organisation: ANSTO Publications Online Antarctic East Antarctic Ice Sheet East Antarctica Ice Lakes ENVELOPE(-131.345,-131.345,60.413,60.413) New Lake ENVELOPE(-109.468,-109.468,62.684,62.684) Prydz Bay Rauer Group ENVELOPE(77.833,77.833,-68.850,-68.850) Quaternary Science Reviews 153 1 10 |
institution |
Open Polar |
collection |
Australian Nuclear Science and Technology Organisation: ANSTO Publications Online |
op_collection_id |
ftansto |
language |
English |
topic |
Glaciers Antartica Isotopes Ice Lakes Sediments |
spellingShingle |
Glaciers Antartica Isotopes Ice Lakes Sediments Berg, S White, DA Bennie, O Fülöp, R Fink, D Wagner, B Melles, M Unglaciated areas in East Antarctica during the Last Glacial (Marine Isotope Stage 3)–New evidence from Rauer Group |
topic_facet |
Glaciers Antartica Isotopes Ice Lakes Sediments |
description |
Limited 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. |
format |
Article in Journal/Newspaper |
author |
Berg, S White, DA Bennie, O Fülöp, R Fink, D Wagner, B Melles, M |
author_facet |
Berg, S White, DA Bennie, O Fülöp, R Fink, D Wagner, B Melles, M |
author_sort |
Berg, S |
title |
Unglaciated areas in East Antarctica during the Last Glacial (Marine Isotope Stage 3)–New evidence from Rauer Group |
title_short |
Unglaciated areas in East Antarctica during the Last Glacial (Marine Isotope Stage 3)–New evidence from Rauer Group |
title_full |
Unglaciated areas in East Antarctica during the Last Glacial (Marine Isotope Stage 3)–New evidence from Rauer Group |
title_fullStr |
Unglaciated areas in East Antarctica during the Last Glacial (Marine Isotope Stage 3)–New evidence from Rauer Group |
title_full_unstemmed |
Unglaciated areas in East Antarctica during the Last Glacial (Marine Isotope Stage 3)–New evidence from Rauer Group |
title_sort |
unglaciated areas in east antarctica during the last glacial (marine isotope stage 3)–new evidence from rauer group |
publisher |
Elsevier |
publishDate |
2016 |
url |
http://apo.ansto.gov.au/dspace/handle/10238/7860 https://doi.org/10.1016/j.quascirev.2016.08.021 |
long_lat |
ENVELOPE(-131.345,-131.345,60.413,60.413) ENVELOPE(-109.468,-109.468,62.684,62.684) ENVELOPE(77.833,77.833,-68.850,-68.850) |
geographic |
Antarctic East Antarctic Ice Sheet East Antarctica Ice Lakes New Lake Prydz Bay Rauer Group |
geographic_facet |
Antarctic East Antarctic Ice Sheet East Antarctica Ice Lakes New Lake Prydz Bay Rauer Group |
genre |
Antarc* Antarctic Antarctica antartic* East Antarctica Ice Sheet Prydz Bay |
genre_facet |
Antarc* Antarctic Antarctica antartic* East Antarctica Ice Sheet Prydz Bay |
op_relation |
Berg, 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.2016.08.021 0277-3791 http://dx.doi.org/10.1016/j.quascirev.2016.08.021 http://apo.ansto.gov.au/dspace/handle/10238/7860 |
op_doi |
https://doi.org/10.1016/j.quascirev.2016.08.021 |
container_title |
Quaternary Science Reviews |
container_volume |
153 |
container_start_page |
1 |
op_container_end_page |
10 |
_version_ |
1766076243455770624 |