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Constraining the contribution of the Antarctic Ice Sheet to Last Interglacial sea-level

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posted on 2023-09-28, 09:48 authored by RL Barnett, J Austermann, B Dyer, MW Telfer, NLM Barlow, SJ Boulton, Andrew Carr, RC Creel
Polar temperatures during the Last Interglacial (LIG; ~129-116 ka) were warmer than today, making this time period an important testing ground to better understand how ice sheets respond to warming. Yet it remains debated how much and when the Antarctic and Greenland ice sheets changed during this period. Here we present a combination of new and existing absolutely dated LIG sea-level observations from southwest Britain, northern France, and Denmark. Due to glacial isostatic adjustment (GIA), the LIG Greenland ice melt contribution to sea-level change in this region is small, which allows us to constrain Antarctic ice melt. Combining data and GIA modelling, we find that the Antarctic contribution to LIG global mean sea level peaked early in the interglacial (prior to 125 ka), with a maximum contribution of 5.6 m (50th percentile, 3.3–8.8 m central 68% probability) before declining. Our results support an asynchronous melt history over the LIG, with an early Antarctic contribution followed by later Greenland ice-sheet mass loss

Funding

National Science Foundation: OCE-1841888

European Research Council: 802281

Sécurité publique du Québec

History

Author affiliation

School of Geography, Geology and the Environment, University of Leicester

Version

  • VoR (Version of Record)

Published in

Science Advances

Volume

9

Issue

27

Publisher

American Association for the Advancement of Science

issn

2375-2548

Copyright date

2023

Available date

2023-09-28

Language

en

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