Bedrock Erosion Surfaces Record Former East Antarctic Ice Sheet Extent

Guy J.G. Paxman*, Stewart S.R. Jamieson, Fausto Ferraccioli, Michael J. Bentley, Neil Ross, Egidio Armadillo, Edward G.W. Gasson, German Leitchenkov, Robert M. DeConto

*Corresponding author for this work

Research output: Contribution to journalArticle (Academic Journal)

6 Citations (Scopus)
170 Downloads (Pure)

Abstract

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 are 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-m 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.

Original languageEnglish
Pages (from-to)4114-4123
Number of pages10
JournalGeophysical Research Letters
Volume45
Issue number9
Early online date9 May 2018
DOIs
Publication statusPublished - 16 May 2018

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    Paxman, G. J. G., Jamieson, S. S. R., Ferraccioli, F., Bentley, M. J., Ross, N., Armadillo, E., Gasson, E. G. W., Leitchenkov, G., & DeConto, R. 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