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Late Pleistocene sea-level constraints across Antarctica

Global sea levels during the last interglacial (LIG), 129,000–116,000 years ago, may have reached as much as 5–10 m higher than present. However, the elevation of the LIG highstand varies locally due to tectonics, subsidence, steric effects, and glacial isostatic adjustment (GIA). The variability br...

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Published in:Quaternary science reviews 2024-10, Vol.341, p.108879, Article 108879
Main Authors: Simms, Alexander R., Ishiwa, Takeshige, Hodgson, Dominic A., Tamura, Toru, DeWitt, Regina
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description Global sea levels during the last interglacial (LIG), 129,000–116,000 years ago, may have reached as much as 5–10 m higher than present. However, the elevation of the LIG highstand varies locally due to tectonics, subsidence, steric effects, and glacial isostatic adjustment (GIA). The variability brought upon by GIA can be used to constrain the past distribution of ice sheets including the source of higher sea levels during the LIG. In spite of its importance for fingerprinting the source of additional meltwater at the LIG, little is known about the elevation of LIG sea levels across Antarctica. In this study we review the geologic constraints on the elevation of the LIG highstand across Antarctica. We find that although several Late Pleistocene sea-level constraints are available across the continent very few of them provide definitive LIG ages. Arguably the most probable LIG sea-level indicators come from East Antarctica but most of them have age constraints approaching the limits of radiocarbon dating (>∼45 ka) with many likely dating to Marine Isotope Stage 3, not the LIG. For West Antarctica, Late Pleistocene sea level constraints are confined to a few poorly or completely undated possible examples from the Antarctic Peninsula. Our review suggests that much more work is needed on constraining the elevation of the LIG highstand across Antarctica. •We compile available Late Pleistocene constraints on past sea levels.•More data exists for East Antarctica than West Antarctica.•Uncertainty remains on whether these constraints are MIS3 or MIS5e in age.
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subjects Eemian
MIS3
MIS5e
Sangamon
title Late Pleistocene sea-level constraints across Antarctica
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