Plausible Last Interglacial Antarctic Ice Sheet Changes Do Not Fully Explain Antarctic Ice Core Water Isotope Records

Zou, Huiling; Sime, Louise C. ORCID: https://orcid.org/0000-0002-9093-7926; Bertler, Nancy A.N.; Keller, Elizabeth D.; Wolff, Eric W.. 2025 Plausible Last Interglacial Antarctic Ice Sheet Changes Do Not Fully Explain Antarctic Ice Core Water Isotope Records. Geophysical Research Letters, 52 (1), e2024GL110657. 12, pp. 10.1029/2024GL110657

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Official URL: https://agupubs.onlinelibrary.wiley.com/doi/10.102...

Abstract/Summary

Antarctic ice cores can help determine ice mass loss from the Antarctic Ice Sheet (AIS) during past warm periods. We compile Last Interglacial (LIG) δ18O measurements from eight Antarctic cores and compare these to new isotope‐enabled LIG simulations, which explore three plausible LIG AIS elevation and extent scenarios. We find that these simulations capture less than 10% of East Antarctic core‐mean δ18Ochanges. Although our simulations do not fully explain the changes, they capture some inter‐core geographicalδ18O variations. Some LIG AIS configurations show higher skill than PI AIS configurations in simulating the inter‐core differences. The remaining discrepancies between the simulated and observed core‐mean water isotope changes suggest that LIG simulations also need to include the influences of reduced Antarctic sea ice, a warmer Southern Ocean, and resultant shifts in vapor source regions to produce a more satisfactory match toδ18O observed at ice core sites.

Item Type:	Publication - Article
Digital Object Identifier (DOI):	10.1029/2024GL110657
ISSN:	00948276
Additional Keywords:	Last Interglacial Warm Period, Ice Mass Loss, Water Isotope Ice Core Records, Antarctic Ice Sheet Changes
Date made live:	07 Jan 2025 16:04 +0 (UTC)
URI:	https://nora.nerc.ac.uk/id/eprint/535793

Item Type:

Publication - Article

Digital Object Identifier (DOI):

10.1029/2024GL110657

ISSN:

00948276

Additional Keywords:

Last Interglacial Warm Period, Ice Mass Loss, Water Isotope Ice Core Records, Antarctic Ice Sheet Changes

Date made live:

07 Jan 2025 16:04 +0 (UTC)

URI:

https://nora.nerc.ac.uk/id/eprint/535793