Antarctic last interglacial isotope peak in response to sea ice retreat not ice-sheet collapse

Max D. Holloway*, Louise C. Sime, Joy S. Singarayer, Julia C. Tindall, Pete Bunch, Paul J. Valdes

*Corresponding author for this work

Research output: Contribution to journalArticle (Academic Journal)peer-review

27 Citations (Scopus)
420 Downloads (Pure)

Abstract

Several studies have suggested that sea-level rise during the last interglacial implies retreat of the West Antarctic Ice Sheet (WAIS). The prevalent hypothesis is that the retreat coincided with the peak Antarctic temperature and stable water isotope values from 128,000 years ago (128 ka); very early in the last interglacial. Here, by analysing climate model simulations of last interglacial WAIS loss featuring water isotopes, we show instead that the isotopic response to WAIS loss is in opposition to the isotopic evidence at 128 ka. Instead, a reduction in winter sea ice area of 65±7% fully explains the 128 ka ice core evidence. Our finding of a marked retreat of the sea ice at 128 ka demonstrates the sensitivity of Antarctic sea ice extent to climate warming.
Original languageEnglish
Article number12293
Number of pages9
JournalNature Communications
Volume7
DOIs
Publication statusPublished - 16 Aug 2016

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