Bedrock erosion surfaces record former East Antarctic Ice Sheet extent

Paxman, Guy J.G.; Jamieson, Stewart S.R.; Ferraccioli, Fausto ORCID: https://orcid.org/0000-0002-9347-4736; Bentley, Michael J.; Ross, Neil; Armadillo, Egidio; Gasson, Edward G.W.; Leitchenkov, German; DeConto, Robert M.. 2018 Bedrock erosion surfaces record former East Antarctic Ice Sheet extent. Geophysical Research Letters, 45 (9). 4114-4123. https://doi.org/10.1029/2018GL077268

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Official URL: http://dx.doi.org/10.1029/2018GL077268

Abstract/Summary

East Antarctica hosts large subglacial basins into which the East Antarctic Ice Sheet (EAIS) likely retreated during past warmer climates. However, the extent of retreat remains poorly constrained, making quantifying past and predicted future contributions to global sea level rise from these marine basins challenging. Geomorphological analysis and flexural modeling within the Wilkes Subglacial Basin is used to reconstruct the ice margin during warm intervals of the Oligocene–Miocene. Flat‐lying bedrock plateaus are indicative of an ice sheet margin positioned >400–500 km inland of the modern grounding zone for extended periods of the Oligocene–Miocene, equivalent to a 2 meter rise in global sea level. Our findings imply that if major EAIS retreat occurs in the future, isostatic rebound will enable the plateau surfaces to act as seeding points for extensive ice rises, thus limiting extensive ice margin retreat of the scale seen during the early EAIS.

Item Type:	Publication - Article
Digital Object Identifier (DOI):	https://doi.org/10.1029/2018GL077268
ISSN:	00948276
Date made live:	08 May 2018 07:46 +0 (UTC)
URI:	https://nora.nerc.ac.uk/id/eprint/519973

Item Type:

Publication - Article

Digital Object Identifier (DOI):

https://doi.org/10.1029/2018GL077268

ISSN:

00948276

Date made live:

08 May 2018 07:46 +0 (UTC)

URI:

https://nora.nerc.ac.uk/id/eprint/519973