A rapidly retreating, marine-terminating glacier's modeled response to perturbations in basal traction

Upernavik Isstrøm, a marine glacier undergoing rapid retreat, is simulated by forcing a numerical model with ocean-driven melt. A review of processes driving retreat led us to hypothesize that a glacier undergoing rapid retreat may be less sensitive to perturbations in the balance of forces than a g...

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Veröffentlicht in:Journal of glaciology Jg. 68; H. 271; S. 891 - 900
Hauptverfasser: Downs, Jacob, Johnson, Jesse V.
Format: Journal Article
Sprache:Englisch
Veröffentlicht: Cambridge, UK Cambridge University Press 01.10.2022
Schlagworte:
Calving
Decoupling
Experiments
Glacial dynamics
glacier flow
Glacier melting
glacier modeling
Glacier retreat
Glaciers
Ice sheets
ice-sheet modeling
Mathematical models
Meltwater
Numerical experiments
Numerical models
Oceans
Perturbation
Perturbations
Sea level
Steady state
Traction
Velocity
Greenland
Calving
glacier modeling
glacier flow
ice-sheet modeling
ISSN:0022-1430, 1727-5652
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Zusammenfassung:Upernavik Isstrøm, a marine glacier undergoing rapid retreat, is simulated by forcing a numerical model with ocean-driven melt. A review of processes driving retreat led us to hypothesize that a glacier undergoing rapid retreat may be less sensitive to perturbations in the balance of forces than a glacier that is undergoing moderate changes or a glacier in steady state. Numerical experiments suggest this is not the case, and that a system in rapid retreat is as sensitive to basal traction perturbations as a system that is near to steady state. This result is important when considering other glacier systems experiencing marine-forced retreat. While the ice–ocean interface is of primary importance, additional perturbations from meltwater-forced decoupling of the glacier from its bed continue to feature in glacier dynamics.
Bibliographie:ObjectType-Article-1
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content type line 14
ISSN:0022-1430
1727-5652
DOI:10.1017/jog.2022.5