Model insights into bed control on retreat of Thwaites Glacier, West Antarctica
Model insights into bed control on retreat of Thwaites Glacier, West Antarctica
复制标题
对西南极洲思韦茨冰川退缩过程中河床控制的模型分析
DOI:
10.1017/jog.2023.13
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发表时间:
2023
影响因子:
3.4
通讯作者:
Morlighem, Mathieu M.
中科院分区:
文献类型:
--
作者:
Schwans, Emily;Parizek, Byron R.;Alley, Richard B.;Anandakrishnan, Sridhar;Morlighem, Mathieu M.
Thwaites Glacier (TG) plays an important role in future sea-level rise (SLR) contribution from the West Antarctic Ice Sheet. Recent observations show that TG is losing mass, and its grounding zone is retreating. Previous modeling has produced a wide range of results concerning whether, when, and how rapidly further retreat will occur under continued warming. These differences arise at least in part from ill-constrained processes, including friction from the bed, and future atmosphere and ocean forcing affecting ice-shelf and grounding-zone buttressing. Here, we apply the Ice Sheet and Sea-level System Model (ISSM) with a range of specifications of basal sliding behavior in response to varying ocean forcing. We find that basin-wide bed character strongly affects TG's response to sub-shelf melt by modulating how changes in driving stress are balanced by the bed as the glacier responds to external forcing. Resulting differences in dynamic thinning patterns alter modeled grounding-line retreat across Thwaites' catchment, affecting both modeled rates and magnitudes of SLR contribution from this critical sector of the ice sheet. Bed character introduces large uncertainties in projections of TG under equal external forcing, pointing to this as a crucial constraint needed in predictive models of West Antarctica.
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DOI:
--
发表时间:
2013
期刊:
影响因子:
--
作者:
C. Raymond;K. Echelmeyer;I. Whillans;C. Doake
通讯作者:
C. Doake
DOI:
--
发表时间:
2018
期刊:
The Cryosphere
影响因子:
--
作者:
T. Pelle;Mathieu Morlighem;J. Bondzio
通讯作者:
J. Bondzio
影响因子:
3.4
作者:
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G. Gudmundsson
DOI:
--
发表时间:
2014
期刊:
影响因子:
--
作者:
H. Seroussi;M. Morlighem;E. Larour;E. Rignot;A. Khazendar
通讯作者:
A. Khazendar
影响因子:
5.2
作者:
Cooper W. Elsworth;J. Suckale
通讯作者:
J. Suckale