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Reversible ice sheet thinning in the Amundsen Sea Embayment during the Late Holocene
File(s)
tc-17-1787-2023.pdf (8.07 MB)
Published version
Author(s)
Balco, Greg
Brown, Nathan
Nichols, Keir
Venturelli, Ryan A
Adams, Jonathan
Type
Journal Article
Abstract
Cosmogenic-nuclide concentrations in subglacial bedrock cores show that the West Antarctic Ice Sheet (WAIS) at a site between Thwaites and Pope glaciers was at least 35 m thinner than present in the past several thousand years and then subsequently thickened. This is important because of concern that present thinning and grounding line retreat at these and nearby glaciers in the Amundsen Sea Embayment may irreversibly lead to deglaciation of significant portions of the WAIS, with decimeter- to meter-scale sea level rise within decades to centuries. A past episode of ice sheet thinning that took place in a similar, although not identical, climate was not irreversible. We propose that the past thinning–thickening cycle was due to a glacioisostatic rebound feedback, similar to that invoked as a possible stabilizing mechanism for current grounding line retreat, in which isostatic uplift caused by Early Holocene thinning led to relative sea level fall favoring grounding line advance.
Date Issued
2023-04-28
Date Acceptance
2023-03-26
Citation
The Cryosphere, 2023, 17 (4), pp.1787-1801
URI
URL
DOI
ISSN
1994-0416
Publisher
Copernicus Publications
Start Page
1787
End Page
1801
Journal / Book Title
The Cryosphere
Volume
17
Issue
4
Copyright Statement
© Author(s) 2023. This work is distributed under
the Creative Commons Attribution 4.0 License.
License URL
Identifier
https://www.webofscience.com/api/gateway?GWVersion=2&SrcApp=PARTNER_APP&SrcAuth=LinksAMR&KeyUT=WOS:000977915200001&DestLinkType=FullRecord&DestApp=ALL_WOS&UsrCustomerID=a2bf6146997ec60c407a63945d4e92bb
Subjects
BE-10
EROSION
EXPOSURE AGES
Geography, Physical
Geology
Geosciences, Multidisciplinary
LEVEL
MARIE-BYRD-LAND
MAXIMUM
Physical Geography
Physical Sciences
PINE ISLAND GLACIER
PRESSURE
RETREAT
Science & Technology
WEDDELL SEA
Publication Status
Published
Date Publish Online
2023-04-28