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Lookup NU author(s): Dr Bethan DaviesORCiD
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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 (26Al, 10Be and 36Cl) 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 ~18ka, 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 ~18ka 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. © 2013.
Author(s): Glasser NF, Davies BJ, Carrivick JL, Rodes A, Hambrey MJ, Smellie JL, Domack E
Publication type: Article
Publication status: Published
Journal: Quaternary Science Reviews
Print publication date: 15/02/2014
Online publication date: 21/01/2014
Acceptance date: 13/11/2013
ISSN (print): 0277-3791
ISSN (electronic): 1873-457X
Publisher: Elsevier Ltd
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