Mon Oct 13, F. Flechtner
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Willen, Matthias O., Wouters, Bert, Broerse, Taco, Buchta, Eric, and Helm, Veit, 2025. Satellite data reveal details of glacial isostatic adjustment in the Amundsen Sea Embayment, West Antarctica. The Cryosphere, 19(6):2213–2227, doi:10.5194/tc-19-2213-2025.
• from the NASA Astrophysics Data System • by the DOI System •
@ARTICLE{2025TCry...19.2213W,
author = {{Willen}, Matthias O. and {Wouters}, Bert and {Broerse}, Taco and {Buchta}, Eric and {Helm}, Veit},
title = "{Satellite data reveal details of glacial isostatic adjustment in the Amundsen Sea Embayment, West Antarctica}",
journal = {The Cryosphere},
year = 2025,
month = jun,
volume = {19},
number = {6},
pages = {2213-2227},
abstract = "{The instability of the West Antarctic Ice Sheet (WAIS) is a tipping
element in the climate system, and it is mainly dictated by
changes in the ice flow behaviour of the outflow glaciers in the
Amundsen Sea Embayment (ASE). Recent studies postulated that the
vertical uplift of bedrock can delay the collapse of glaciers in
this region. In West Antarctica, bedrock motion is largely
caused by a fast viscoelastic response of the upper mantle to
changes in ice loads over the last centuries. This glacial
isostatic adjustment (GIA) effect is currently poorly
understood, since Earth's rheology and the ice-loading history
are both subject to large uncertainties in simulations.
Moreover, results from data-driven approaches have not yet
resolved GIA at a sufficient spatial resolution. We present a
data-driven GIA estimate, based on data from GRACE/GRACE-FO
(GRACE and GRACE-FO), CryoSat-2 altimetry, regional climate
modelling, and firn modelling, which is the first to agree with
independent vertical velocities in West Antarctica derived from
global navigation satellite system (GNSS) data. Our data
combination yields a maximum GIA bedrock motion rate of 43
{\ensuremath{\pm}} 7 mma-1 in the Thwaites Glacier region and
agrees within uncertainties in the GNSS-derived rate. The data-
driven GIA-related bedrock motion may be used in future
simulation runs to quantify a potential delay of the collapse of
the West Antarctic Ice Sheet due to the stabilization effects
induced by GIA. Furthermore it may be used for testing
rheological models with low upper-mantle viscosity in
conjunction with centennial loading histories.}",
doi = {10.5194/tc-19-2213-2025},
adsurl = {https://ui.adsabs.harvard.edu/abs/2025TCry...19.2213W},
adsnote = {Provided by the SAO/NASA Astrophysics Data System}
}
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Mon Oct 13, F. Flechtner