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Antarctic Ice Sheet Elevation Impacts on Water Isotope Records During the Last Interglacial
Author(s) -
Goursaud Sentia,
Holloway Max,
Sime Louise,
Wolff Eric,
Valdes Paul,
Steig Eric J.,
Pauling Andrew
Publication year - 2021
Publication title -
geophysical research letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.007
H-Index - 273
eISSN - 1944-8007
pISSN - 0094-8276
DOI - 10.1029/2020gl091412
Subject(s) - ice core , interglacial , geology , elevation (ballistics) , antarctic ice sheet , ice sheet , climatology , ice sheet model , δ18o , ice stream , greenland ice sheet , oceanography , cryosphere , physical geography , stable isotope ratio , sea ice , quaternary , paleontology , geography , geometry , mathematics , physics , quantum mechanics
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 δ 18 O 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 δ 18 O 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 δ 18 O 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.