Highly variable friction and slip observed at Antarctic ice stream bed
The slip of glaciers over the underlying bed is the dominant mechanism governing the migration of ice from land into the oceans, with accelerating slip contributing to sea-level rise. Yet glacier slip remains poorly understood, and observational constraints are sparse. Here we use passive seismic ob...
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Nature Research
2023
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Online Access: | https://publikationen.bibliothek.kit.edu/1000160159 https://publikationen.bibliothek.kit.edu/1000160159/150953360 https://doi.org/10.5445/IR/1000160159 |
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ftubkarlsruhe:oai:EVASTAR-Karlsruhe.de:1000160159 2023-07-30T03:58:41+02:00 Highly variable friction and slip observed at Antarctic ice stream bed Hudson, T. S. Kufner, S. K. Brisbourne, A. M. Kendall, J. M. Smith, A. M. Alley, R. B. Arthern, R. J. Murray, T. 2023-07-04 application/pdf https://publikationen.bibliothek.kit.edu/1000160159 https://publikationen.bibliothek.kit.edu/1000160159/150953360 https://doi.org/10.5445/IR/1000160159 eng eng Nature Research info:eu-repo/semantics/altIdentifier/wos/001008415900001 info:eu-repo/semantics/altIdentifier/doi/10.1038/s41561-023-01204-4 info:eu-repo/semantics/altIdentifier/issn/1752-0894 info:eu-repo/semantics/altIdentifier/issn/1752-0908 https://publikationen.bibliothek.kit.edu/1000160159 https://publikationen.bibliothek.kit.edu/1000160159/150953360 https://doi.org/10.5445/IR/1000160159 https://creativecommons.org/licenses/by/4.0/deed.de info:eu-repo/semantics/openAccess Nature Geoscience ISSN: 1752-0894, 1752-0908 Climate change Cryospheric science Seismology ddc:530 Physics info:eu-repo/classification/ddc/530 doc-type:article Text info:eu-repo/semantics/article article info:eu-repo/semantics/publishedVersion 2023 ftubkarlsruhe https://doi.org/10.5445/IR/100016015910.1038/s41561-023-01204-4 2023-07-09T22:09:00Z The slip of glaciers over the underlying bed is the dominant mechanism governing the migration of ice from land into the oceans, with accelerating slip contributing to sea-level rise. Yet glacier slip remains poorly understood, and observational constraints are sparse. Here we use passive seismic observations to measure both frictional shear stress and slip at the bed of the Rutford Ice Stream in Antarctica using 100,000 repetitive stick-slip icequakes. We find that basal shear stresses and slip rates vary from 10$^4$ to 10$^7$ Pa and 0.2 to 1.5 m per day, respectively. Friction and slip vary temporally over the order of hours, and spatially over 10s of metres, due to corresponding variations in effective normal stress and ice–bed interface material. Our findings suggest that the bed is substantially more complex than currently assumed in ice stream models and that basal effective normal stresses may be significantly higher than previously thought. Our observations can provide constraints on the basal boundary conditions for ice-dynamics models. This is critical for constraining the primary contribution of ice mass loss in Antarctica and hence for reducing uncertainty in sea-level rise projections. Article in Journal/Newspaper Antarc* Antarctic Antarctica Rutford Ice Stream KITopen (Karlsruhe Institute of Technologie) Antarctic Rutford ENVELOPE(-85.300,-85.300,-78.600,-78.600) Rutford Ice Stream ENVELOPE(-80.000,-80.000,-79.167,-79.167) |
institution |
Open Polar |
collection |
KITopen (Karlsruhe Institute of Technologie) |
op_collection_id |
ftubkarlsruhe |
language |
English |
topic |
Climate change Cryospheric science Seismology ddc:530 Physics info:eu-repo/classification/ddc/530 |
spellingShingle |
Climate change Cryospheric science Seismology ddc:530 Physics info:eu-repo/classification/ddc/530 Hudson, T. S. Kufner, S. K. Brisbourne, A. M. Kendall, J. M. Smith, A. M. Alley, R. B. Arthern, R. J. Murray, T. Highly variable friction and slip observed at Antarctic ice stream bed |
topic_facet |
Climate change Cryospheric science Seismology ddc:530 Physics info:eu-repo/classification/ddc/530 |
description |
The slip of glaciers over the underlying bed is the dominant mechanism governing the migration of ice from land into the oceans, with accelerating slip contributing to sea-level rise. Yet glacier slip remains poorly understood, and observational constraints are sparse. Here we use passive seismic observations to measure both frictional shear stress and slip at the bed of the Rutford Ice Stream in Antarctica using 100,000 repetitive stick-slip icequakes. We find that basal shear stresses and slip rates vary from 10$^4$ to 10$^7$ Pa and 0.2 to 1.5 m per day, respectively. Friction and slip vary temporally over the order of hours, and spatially over 10s of metres, due to corresponding variations in effective normal stress and ice–bed interface material. Our findings suggest that the bed is substantially more complex than currently assumed in ice stream models and that basal effective normal stresses may be significantly higher than previously thought. Our observations can provide constraints on the basal boundary conditions for ice-dynamics models. This is critical for constraining the primary contribution of ice mass loss in Antarctica and hence for reducing uncertainty in sea-level rise projections. |
format |
Article in Journal/Newspaper |
author |
Hudson, T. S. Kufner, S. K. Brisbourne, A. M. Kendall, J. M. Smith, A. M. Alley, R. B. Arthern, R. J. Murray, T. |
author_facet |
Hudson, T. S. Kufner, S. K. Brisbourne, A. M. Kendall, J. M. Smith, A. M. Alley, R. B. Arthern, R. J. Murray, T. |
author_sort |
Hudson, T. S. |
title |
Highly variable friction and slip observed at Antarctic ice stream bed |
title_short |
Highly variable friction and slip observed at Antarctic ice stream bed |
title_full |
Highly variable friction and slip observed at Antarctic ice stream bed |
title_fullStr |
Highly variable friction and slip observed at Antarctic ice stream bed |
title_full_unstemmed |
Highly variable friction and slip observed at Antarctic ice stream bed |
title_sort |
highly variable friction and slip observed at antarctic ice stream bed |
publisher |
Nature Research |
publishDate |
2023 |
url |
https://publikationen.bibliothek.kit.edu/1000160159 https://publikationen.bibliothek.kit.edu/1000160159/150953360 https://doi.org/10.5445/IR/1000160159 |
long_lat |
ENVELOPE(-85.300,-85.300,-78.600,-78.600) ENVELOPE(-80.000,-80.000,-79.167,-79.167) |
geographic |
Antarctic Rutford Rutford Ice Stream |
geographic_facet |
Antarctic Rutford Rutford Ice Stream |
genre |
Antarc* Antarctic Antarctica Rutford Ice Stream |
genre_facet |
Antarc* Antarctic Antarctica Rutford Ice Stream |
op_source |
Nature Geoscience ISSN: 1752-0894, 1752-0908 |
op_relation |
info:eu-repo/semantics/altIdentifier/wos/001008415900001 info:eu-repo/semantics/altIdentifier/doi/10.1038/s41561-023-01204-4 info:eu-repo/semantics/altIdentifier/issn/1752-0894 info:eu-repo/semantics/altIdentifier/issn/1752-0908 https://publikationen.bibliothek.kit.edu/1000160159 https://publikationen.bibliothek.kit.edu/1000160159/150953360 https://doi.org/10.5445/IR/1000160159 |
op_rights |
https://creativecommons.org/licenses/by/4.0/deed.de info:eu-repo/semantics/openAccess |
op_doi |
https://doi.org/10.5445/IR/100016015910.1038/s41561-023-01204-4 |
_version_ |
1772821423332524032 |