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Low post-glacial rebound rates in the Weddell Sea due to Late Holocene ice-sheet readvance

Citation

Bradley, SL and Hindmarsh, RCA and Whitehouse, PL and Bentley, MJ and King, MA, Low post-glacial rebound rates in the Weddell Sea due to Late Holocene ice-sheet readvance, Earth and Planetary Science Letters, 413 pp. 79-89. ISSN 0012-821X (2015) [Refereed Article]


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Licensed under Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International (CC BY-NC-ND 4.0) https://creativecommons.org/licenses/by-nc-nd/4.0/

DOI: doi:10.1016/j.epsl.2014.12.039

Abstract

Many ice-sheet reconstructions assume monotonic Holocene retreat for the West Antarctic Ice Sheet, but an increasing number of glaciological observations infer that some portions of the ice sheet may be readvancing, following retreat behind the present-day margin. A readvance in the Weddell Sea region can reconcile two outstanding problems: (i) the present-day widespread occurrence of seemingly stable ice streams grounded on beds that deepen inland; and (ii) the inability of models of glacial isostatic adjustment to match present-day uplift rates. By combining a suite of ice loading histories that include a readvance with a model of glacial isostatic adjustment we report substantial improvements to predictions of present-day uplift rates, including reconciling one problematic observation of land sinking. We suggest retreat behind present grounding lines occurred when the bed was lower, and isostatic recovery has since led to shallowing, ice sheet re-grounding and readvance. The paradoxical existence of grounding lines in apparently unstable configurations on reverse bed slopes may be resolved by invoking the process of unstable advance, in accordance with our load modelling.

Item Details

Item Type:Refereed Article
Keywords:Antarctic Ice Sheet, Late Holocene, glacial isostatic adjustment, grounding line stability, uplift rate, Weddell Sea, deglaciation
Research Division:Engineering
Research Group:Geomatic Engineering
Research Field:Geodesy
Objective Division:Environment
Objective Group:Climate and Climate Change
Objective Field:Social Impacts of Climate Change and Variability
Author:King, MA (Professor Matt King)
ID Code:101009
Year Published:2015
Funding Support:Australian Research Council (FT110100207)
Web of Science® Times Cited:12
Deposited By:Geography and Environmental Studies
Deposited On:2015-06-05
Last Modified:2017-10-24
Downloads:113 View Download Statistics

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