Antarctic Ice Sheet Elevation Impacts on Water Isotope Records During the Last Interglacial

Sentia Goursaud, Max Holloway, Louise Sime, Eric Wolff, Paul Valdes, Eric J. Steig, Andrew Pauling

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Abstract

Changes of the topography of the Antarctic Ice Sheet (AIS) can complicate the interpretation of ice core water stable isotope measurements in terms of temperature. Here, we use a set of idealized AIS elevation change scenarios to investigate this for the warm Last Interglacial (LIG). We show that LIG δ18O against elevation relationships is not uniform across Antarctica and that the LIG response to elevation is lower than the preindustrial response. The effect of LIG elevation‐induced sea ice changes on δ18O is small, allowing us to isolate the effect of elevation change alone. Our results help to define the effect of AIS changes on the LIG δ18O signals and should be invaluable to those seeking to use AIS ice core measurements for these purposes. Especially, our simulations strengthen the conclusion that ice core measurements from the Talos Dome core exclude the loss of the Wilkes Basin at around 128 kyr.
Original languageEnglish
Number of pages10
JournalGeophysical Research Letters
Volume48
Issue number6
Early online date28 Dec 2020
DOIs
Publication statusPublished - 25 Mar 2021

Keywords

  • climate modelling
  • effect of the elevation
  • last interglacial
  • water stable isotopes

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