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A community-based geological reconstruction of Antarctic Ice Sheet deglaciation since the Last Glacial Maximum

Citation

Bentley, M and Cofaigh, C and Anderson, J and Conway, H and Davies, B and Graham, A and Hillenbrand, C-D and Hodgson, D and Jamieson, S and Larter, R and Mackintosh, A and Smith, J and Verleyen, E and Ackert, R and Bart, P and Berg, S and Brunstein, D and Canals, M and Colhoun, E and Crosta, X and Dickens, W and Domack, E and Dowdeswell, J and Dunbar, R and Ehrmann, W and Evans, J and Favier, V and Fink, D and Fogwill, C and Glasser, N and Gohl, K and Golledge, N and Goodwin, I and Gore, D and Greenwood, S and Hall, B and Hall, K and Hedding, D and Hein, A and Hocking, E and Jakobsson, M and Johnson, J and Jomelli, V and Selwyn Jones, R and Klages, J and Kristoffersen, Y and Kuhn, G and Leventer, A and Licht, K and Lilly, K and Lindow, J and Livingstone, S and Masse, G and McGlone, M and McKay, R and Melles, M and Miura, H and Mulvaney, R and Nel, W and Nitsche, F and O'Brien, P and Post, A and Roberts, S and Saunders, K and Selkirk, P and Simms, A and Spiegel, C and Stolldorf, T and Sugden, D and van der Putten, N and van Ommen, TD and Verfaillie, D and Vyverman, W and Wagner, B and White, D and Witus, A and Zwartz, D and The RAISED Consortium, A community-based geological reconstruction of Antarctic Ice Sheet deglaciation since the Last Glacial Maximum, Quaternary Science Reviews, 100 pp. 1-9. ISSN 0277-3791 (2014) [Refereed Article]


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Licensed under Creative Commons Attribution 3.0 Unported (CC BY 3.0) http://creativecommons.org/licenses/by/3.0/

DOI: doi:10.1016/j.quascirev.2014.06.025

Abstract

A robust understanding of Antarctic Ice Sheet deglacial history since the Last Glacial Maximum is important in order to constrain ice sheet and glacial-isostatic adjustment models, and to explore the forcing mechanisms responsible for ice sheet retreat. Such understanding can be derived from a broad range of geological and glaciological datasets and recent decades have seen an upsurge in such data gathering around the continent and Sub-Antarctic islands. Here, we report a new synthesis of those datasets, based on an accompanying series of reviews of the geological data, organised by sector. We present a series of timeslice maps for 20 ka, 15 ka, 10 ka and 5 ka, including grounding line position and ice sheet thickness changes, along with a clear assessment of levels of confidence. The reconstruction shows that the Antarctic Ice sheet did not everywhere reach the continental shelf edge at its maximum, that initial retreat was asynchronous, and that the spatial pattern of deglaciation was highly variable, particularly on the inner shelf. The deglacial reconstruction is consistent with a moderate overall excess ice volume and with a relatively small Antarctic contribution to meltwater pulse 1a. We discuss key areas of uncertainty both around the continent and by time interval, and we highlight potential priorities for future work. The synthesis is intended to be a resource for the modelling and glacial geological community.

Item Details

Item Type:Refereed Article
Keywords:Antarctic Ice Sheet, Glacial geology, Modelling, Quaternary
Research Division:Earth Sciences
Research Group:Physical geography and environmental geoscience
Research Field:Glaciology
Objective Division:Expanding Knowledge
Objective Group:Expanding knowledge
Objective Field:Expanding knowledge in the earth sciences
UTAS Author:van Ommen, TD (Dr Tas van Ommen)
ID Code:98395
Year Published:2014
Web of Science® Times Cited:143
Deposited By:CRC-Antarctic Climate & Ecosystems
Deposited On:2015-02-13
Last Modified:2017-10-30
Downloads:315 View Download Statistics

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