Regularized Coulomb Friction Laws for Ice Sheet Sliding: Application to Pine Island Glacier, Antarctica
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...
Published in: | Geophysical Research Letters |
---|---|
Main Authors: | , , |
Format: | Text |
Language: | English |
Published: |
John Wiley and Sons Inc.
2019
|
Subjects: | |
Online Access: | http://www.ncbi.nlm.nih.gov/pmc/articles/PMC6582595/ https://doi.org/10.1029/2019GL082526 |
id |
ftpubmed:oai:pubmedcentral.nih.gov:6582595 |
---|---|
record_format |
openpolar |
spelling |
ftpubmed:oai:pubmedcentral.nih.gov:6582595 2023-05-15T13:35:03+02:00 Regularized Coulomb Friction Laws for Ice Sheet Sliding: Application to Pine Island Glacier, Antarctica Joughin, Ian Smith, Benjamin E. Schoof, Christian G. 2019-05-13 http://www.ncbi.nlm.nih.gov/pmc/articles/PMC6582595/ https://doi.org/10.1029/2019GL082526 en eng John Wiley and Sons Inc. http://www.ncbi.nlm.nih.gov/pmc/articles/PMC6582595/ http://dx.doi.org/10.1029/2019GL082526 ©2019. The Authors. This is an open access article under the terms of the http://creativecommons.org/licenses/by-nc-nd/4.0/ License, which permits use and distribution in any medium, provided the original work is properly cited, the use is non‐commercial and no modifications or adaptations are made. CC-BY-NC-ND Research Letters Text 2019 ftpubmed https://doi.org/10.1029/2019GL082526 2019-06-30T01:03:17Z 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. Text Antarc* Antarctica Ice Sheet Pine Island Pine Island Glacier PubMed Central (PMC) Pine Island Glacier ENVELOPE(-101.000,-101.000,-75.000,-75.000) Geophysical Research Letters 46 9 4764 4771 |
institution |
Open Polar |
collection |
PubMed Central (PMC) |
op_collection_id |
ftpubmed |
language |
English |
topic |
Research Letters |
spellingShingle |
Research Letters Joughin, Ian Smith, Benjamin E. Schoof, Christian G. Regularized Coulomb Friction Laws for Ice Sheet Sliding: Application to Pine Island Glacier, Antarctica |
topic_facet |
Research Letters |
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 |
Text |
author |
Joughin, Ian Smith, Benjamin E. Schoof, Christian G. |
author_facet |
Joughin, Ian Smith, Benjamin E. Schoof, Christian G. |
author_sort |
Joughin, Ian |
title |
Regularized Coulomb Friction Laws for Ice Sheet Sliding: Application to Pine Island Glacier, Antarctica |
title_short |
Regularized Coulomb Friction Laws for Ice Sheet Sliding: Application to Pine Island Glacier, Antarctica |
title_full |
Regularized Coulomb Friction Laws for Ice Sheet Sliding: Application to Pine Island Glacier, Antarctica |
title_fullStr |
Regularized Coulomb Friction Laws for Ice Sheet Sliding: Application to Pine Island Glacier, Antarctica |
title_full_unstemmed |
Regularized Coulomb Friction Laws for Ice Sheet Sliding: Application to Pine Island Glacier, Antarctica |
title_sort |
regularized coulomb friction laws for ice sheet sliding: application to pine island glacier, antarctica |
publisher |
John Wiley and Sons Inc. |
publishDate |
2019 |
url |
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC6582595/ https://doi.org/10.1029/2019GL082526 |
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://www.ncbi.nlm.nih.gov/pmc/articles/PMC6582595/ http://dx.doi.org/10.1029/2019GL082526 |
op_rights |
©2019. The Authors. This is an open access article under the terms of the http://creativecommons.org/licenses/by-nc-nd/4.0/ License, which permits use and distribution in any medium, provided the original work is properly cited, the use is non‐commercial and no modifications or adaptations are made. |
op_rightsnorm |
CC-BY-NC-ND |
op_doi |
https://doi.org/10.1029/2019GL082526 |
container_title |
Geophysical Research Letters |
container_volume |
46 |
container_issue |
9 |
container_start_page |
4764 |
op_container_end_page |
4771 |
_version_ |
1766060541663510528 |