Regularized Coulomb Friction Laws for Ice Sheet Sliding: Application to Pine Island Glacier, Antarctica, [Data supporting Geophysical Res. Lett. Paper 2019GL082526R]
The choice of the best basal friction law to use in ice-sheet models remains a source of uncertainty in projections of sea level. The parameters in commonly used friction laws can produce a broad range of behavior and are poorly constrained. Here we use a time series of elevation and speed data to e...
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ftunivwashington:oai:digital.lib.washington.edu:1773/43479 2023-05-15T13:36:48+02:00 Regularized Coulomb Friction Laws for Ice Sheet Sliding: Application to Pine Island Glacier, Antarctica, [Data supporting Geophysical Res. Lett. Paper 2019GL082526R] Joughin, Ian 2019-04-01 http://hdl.handle.net/1773/43479 en_US eng http://hdl.handle.net/1773/43479 CC0 1.0 Universal http://creativecommons.org/publicdomain/zero/1.0/ Dataset 2019 ftunivwashington 2023-03-12T18:59:08Z The choice of the best basal friction law to use in ice-sheet models remains a source of uncertainty in projections of sea level. The parameters in commonly used friction laws can produce a broad range of behavior and are poorly constrained. Here we use a time series of elevation and speed data to examine the simulated transient response of Pine Island Glacier, Antarctica, to a loss of basal traction as its grounding line retreats. We evaluate a variety of friction laws, which produces a diversity of responses, to determine which best reproduces the observed speedup when forced with the observed thinning. Forms of the commonly used power-law friction provide much larger model-data disagreement than less commonly used regularized Coulomb friction in which cavitation effects yield an upper bound on basal friction. Thus, adoption of such friction laws could substantially improve the fidelity of large-scale simulations to determine future sea level. Dataset Antarc* Antarctica Ice Sheet Pine Island Pine Island Glacier University of Washington, Seattle: ResearchWorks Pine Island Glacier ENVELOPE(-101.000,-101.000,-75.000,-75.000) |
institution |
Open Polar |
collection |
University of Washington, Seattle: ResearchWorks |
op_collection_id |
ftunivwashington |
language |
English |
description |
The choice of the best basal friction law to use in ice-sheet models remains a source of uncertainty in projections of sea level. The parameters in commonly used friction laws can produce a broad range of behavior and are poorly constrained. Here we use a time series of elevation and speed data to examine the simulated transient response of Pine Island Glacier, Antarctica, to a loss of basal traction as its grounding line retreats. We evaluate a variety of friction laws, which produces a diversity of responses, to determine which best reproduces the observed speedup when forced with the observed thinning. Forms of the commonly used power-law friction provide much larger model-data disagreement than less commonly used regularized Coulomb friction in which cavitation effects yield an upper bound on basal friction. Thus, adoption of such friction laws could substantially improve the fidelity of large-scale simulations to determine future sea level. |
format |
Dataset |
author |
Joughin, Ian |
spellingShingle |
Joughin, Ian Regularized Coulomb Friction Laws for Ice Sheet Sliding: Application to Pine Island Glacier, Antarctica, [Data supporting Geophysical Res. Lett. Paper 2019GL082526R] |
author_facet |
Joughin, Ian |
author_sort |
Joughin, Ian |
title |
Regularized Coulomb Friction Laws for Ice Sheet Sliding: Application to Pine Island Glacier, Antarctica, [Data supporting Geophysical Res. Lett. Paper 2019GL082526R] |
title_short |
Regularized Coulomb Friction Laws for Ice Sheet Sliding: Application to Pine Island Glacier, Antarctica, [Data supporting Geophysical Res. Lett. Paper 2019GL082526R] |
title_full |
Regularized Coulomb Friction Laws for Ice Sheet Sliding: Application to Pine Island Glacier, Antarctica, [Data supporting Geophysical Res. Lett. Paper 2019GL082526R] |
title_fullStr |
Regularized Coulomb Friction Laws for Ice Sheet Sliding: Application to Pine Island Glacier, Antarctica, [Data supporting Geophysical Res. Lett. Paper 2019GL082526R] |
title_full_unstemmed |
Regularized Coulomb Friction Laws for Ice Sheet Sliding: Application to Pine Island Glacier, Antarctica, [Data supporting Geophysical Res. Lett. Paper 2019GL082526R] |
title_sort |
regularized coulomb friction laws for ice sheet sliding: application to pine island glacier, antarctica, [data supporting geophysical res. lett. paper 2019gl082526r] |
publishDate |
2019 |
url |
http://hdl.handle.net/1773/43479 |
long_lat |
ENVELOPE(-101.000,-101.000,-75.000,-75.000) |
geographic |
Pine Island Glacier |
geographic_facet |
Pine Island Glacier |
genre |
Antarc* Antarctica Ice Sheet Pine Island Pine Island Glacier |
genre_facet |
Antarc* Antarctica Ice Sheet Pine Island Pine Island Glacier |
op_relation |
http://hdl.handle.net/1773/43479 |
op_rights |
CC0 1.0 Universal http://creativecommons.org/publicdomain/zero/1.0/ |
_version_ |
1766084414018682880 |