BibTex format
@misc{Marschalek:2025:10.5194/egusphere-egu25-17938,
author = {Marschalek, J and Pastore, G and van, de Flierdt T and Patterson, M and McKay, R and Holder, L and Grant, G and Mueller, J and Xiao, W and Kim, S and Cortese, G and Bombard, S and Leckie, RM and van, Peer T and Sugisaki, S and Seki, O and Kulhanek, D and Vermeesch, P and Carter, A and Gasson, E},
doi = {10.5194/egusphere-egu25-17938},
title = {Evidence for West Antarctic Ice Sheet sensitivity to different recent Pleistocene interglacial climates},
type = {Other},
url = {http://dx.doi.org/10.5194/egusphere-egu25-17938},
year = {2025}
}
RIS format (EndNote, RefMan)
TY - GEN
AB - <jats:p>The warmer-than-present interglacial periods of the late Pleistocene provide the closest palaeo analogues to inform predictions of Antarctic ice sheet mass loss over the coming decades and centuries. However, the response of Antarctica’s ice sheets to environmental conditions during these interglacial periods remains poorly constrained, resulting in significant uncertainties in ice sheet model predictions of future sea-level rise. Here, sediment provenance analyses (Nd and Sr isotope compositions, detrital zircon U-Pb dates and heavy mineral counts) reveal changes to ice sheet extent in the Ross Sea over the glacial-interglacial cycles of the last ~400 kyr at International Ocean Discovery Program (IODP) Site U1524.Glacial periods show a broadly mixed East/West Antarctic provenance signature, consistent with an ice sheet grounded across most of the Ross Sea continental shelf that reworked older sediments. In contrast, interglacial intervals - including the Holocene - consist primarily of sediment derived from West Antarctica, suggesting westward transport by ocean currents dominates sediment delivery to the site. Detailed examination of these West Antarctic sourced intervals reveals a consistent pattern of provenance change over the course of each interglacial examined. East Antarctic-derived sediment is only dominant at the site for two short-lived intervals just after two interglacial periods, thought to be Marine Isotope Stage (MIS) 11 and MIS 9 based on the current age model. These intervals may record a transient ice sheet configuration in the earliest part of each glacial period where the Ross Ice Shelf had grown to a larger-than-present size, whilst the grounding zone had not yet advanced far beyond its present-day location. Critically, each of these two East Antarctic dominated intervals displays different provenance characteristics, implying differing ice flow patterns in the Ross Ice Shelf and therefore different ice sheet extent
AU - Marschalek,J
AU - Pastore,G
AU - van,de Flierdt T
AU - Patterson,M
AU - McKay,R
AU - Holder,L
AU - Grant,G
AU - Mueller,J
AU - Xiao,W
AU - Kim,S
AU - Cortese,G
AU - Bombard,S
AU - Leckie,RM
AU - van,Peer T
AU - Sugisaki,S
AU - Seki,O
AU - Kulhanek,D
AU - Vermeesch,P
AU - Carter,A
AU - Gasson,E
DO - 10.5194/egusphere-egu25-17938
PY - 2025///
TI - Evidence for West Antarctic Ice Sheet sensitivity to different recent Pleistocene interglacial climates
UR - http://dx.doi.org/10.5194/egusphere-egu25-17938
UR - https://doi.org/10.5194/egusphere-egu25-17938
ER -