Journal
QUATERNARY SCIENCE REVIEWS
Volume 86, Issue -, Pages 78-88Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.quascirev.2013.11.012
Keywords
Antarctica; Ice streams; Cosmogenic isotope dating
Funding
- UK Natural Environment Research Council (NERC) under the Antarctic Funding Initiative [NE/F012942/1]
- NERC CIAF grant [9035/0407]
- British Antarctic Survey
- NERC [ciaf010001, NE/F015518/1, NE/F012942/1, NE/F012896/1] Funding Source: UKRI
- Natural Environment Research Council [ciaf010001, NE/F015518/1, NE/F012942/1, NE/F012896/1] Funding Source: researchfish
- Office of Polar Programs (OPP)
- Directorate For Geosciences [1430002] Funding Source: National Science Foundation
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Predicting the future response of the Antarctic Ice Sheet to climate change requires an understanding of the ice streams that dominate its dynamics. Here we use cosmogenic isotope exposure-age dating (Al-26, Be-10 and Cl-36) of erratic boulders on ice-free land on James Ross Island, north-eastern Antarctic Peninsula, to define the evolution of Last Glacial Maximum (LGM) ice in the adjacent Prince Gustav Channel. These data include ice-sheet extent, thickness and dynamical behaviour. Prior to similar to 18 ka, the LGM Antarctic Peninsula Ice Sheet extended to the continental shelf-edge and transported erratic boulders onto high-elevation mesas on James Ross Island. After similar to 18 ka there was a period of rapid ice-sheet surface-lowering, coincident with the initiation of the Prince Gustav Ice Stream. This timing coincided with rapid increases in atmospheric temperature and eustatic sea-level rise around the Antarctic Peninsula. Collectively, these data provide evidence for a transition from a thick, cold-based LGM Antarctic Peninsula Ice Sheet to a thinner, partially warm-based ice sheet during deglaciation. Crown Copyright (C) 2013 Published by Elsevier Ltd. All rights reserved.
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