Ice-cliff Failure via Retrogressive Slumping
Retrogressive slumping could accelerate sea-level rise if ice-sheet retreat generates ice cliffs much taller than observed today. The tallest ice cliffs, which extend roughly 100 m above sea level, calve only after ice-flow processes thin the ice to near flotation. Above some ice-cliff height limit,...
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Digital Commons @ University of South Florida
2019
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Online Access: | https://digitalcommons.usf.edu/geo_facpub/2286 https://doi.org/10.1130/G45880.1 https://digitalcommons.usf.edu/context/geo_facpub/article/3254/viewcontent/449.pdf |
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ftusouthflorida:oai:digitalcommons.usf.edu:geo_facpub-3254 2023-07-30T04:03:37+02:00 Ice-cliff Failure via Retrogressive Slumping Parizek, Byron R. Christianson, Knut Alley, Richard B. Voytenko, Denis Vaňková, Irena Dixon, Timothy H. Walker, Ryan T. Holland, David M. 2019-03-01T08:00:00Z application/pdf https://digitalcommons.usf.edu/geo_facpub/2286 https://doi.org/10.1130/G45880.1 https://digitalcommons.usf.edu/context/geo_facpub/article/3254/viewcontent/449.pdf unknown Digital Commons @ University of South Florida https://digitalcommons.usf.edu/geo_facpub/2286 doi:10.1130/G45880.1 https://digitalcommons.usf.edu/context/geo_facpub/article/3254/viewcontent/449.pdf School of Geosciences Faculty and Staff Publications Earth Sciences article 2019 ftusouthflorida https://doi.org/10.1130/G45880.1 2023-07-13T20:49:24Z Retrogressive slumping could accelerate sea-level rise if ice-sheet retreat generates ice cliffs much taller than observed today. The tallest ice cliffs, which extend roughly 100 m above sea level, calve only after ice-flow processes thin the ice to near flotation. Above some ice-cliff height limit, the stress state in ice will satisfy the material-failure criterion, resulting in faster brittle failure. New terrestrial radar data from Helheim Glacier, Greenland, suggest that taller subaerial cliffs are prone to failure by slumping, unloading submarine ice to allow buoyancy-driven full-thickness calving. Full-Stokes diagnostic modeling shows that the threshold cliff height for slumping is likely slightly above 100 m in many cases, and roughly twice that (145–285 m) in mechanically competent ice under well-drained or low-melt conditions. Article in Journal/Newspaper glacier Greenland Ice Sheet University of South Florida St. Petersburg: Digital USFSP Greenland Geology 47 5 449 452 |
institution |
Open Polar |
collection |
University of South Florida St. Petersburg: Digital USFSP |
op_collection_id |
ftusouthflorida |
language |
unknown |
topic |
Earth Sciences |
spellingShingle |
Earth Sciences Parizek, Byron R. Christianson, Knut Alley, Richard B. Voytenko, Denis Vaňková, Irena Dixon, Timothy H. Walker, Ryan T. Holland, David M. Ice-cliff Failure via Retrogressive Slumping |
topic_facet |
Earth Sciences |
description |
Retrogressive slumping could accelerate sea-level rise if ice-sheet retreat generates ice cliffs much taller than observed today. The tallest ice cliffs, which extend roughly 100 m above sea level, calve only after ice-flow processes thin the ice to near flotation. Above some ice-cliff height limit, the stress state in ice will satisfy the material-failure criterion, resulting in faster brittle failure. New terrestrial radar data from Helheim Glacier, Greenland, suggest that taller subaerial cliffs are prone to failure by slumping, unloading submarine ice to allow buoyancy-driven full-thickness calving. Full-Stokes diagnostic modeling shows that the threshold cliff height for slumping is likely slightly above 100 m in many cases, and roughly twice that (145–285 m) in mechanically competent ice under well-drained or low-melt conditions. |
format |
Article in Journal/Newspaper |
author |
Parizek, Byron R. Christianson, Knut Alley, Richard B. Voytenko, Denis Vaňková, Irena Dixon, Timothy H. Walker, Ryan T. Holland, David M. |
author_facet |
Parizek, Byron R. Christianson, Knut Alley, Richard B. Voytenko, Denis Vaňková, Irena Dixon, Timothy H. Walker, Ryan T. Holland, David M. |
author_sort |
Parizek, Byron R. |
title |
Ice-cliff Failure via Retrogressive Slumping |
title_short |
Ice-cliff Failure via Retrogressive Slumping |
title_full |
Ice-cliff Failure via Retrogressive Slumping |
title_fullStr |
Ice-cliff Failure via Retrogressive Slumping |
title_full_unstemmed |
Ice-cliff Failure via Retrogressive Slumping |
title_sort |
ice-cliff failure via retrogressive slumping |
publisher |
Digital Commons @ University of South Florida |
publishDate |
2019 |
url |
https://digitalcommons.usf.edu/geo_facpub/2286 https://doi.org/10.1130/G45880.1 https://digitalcommons.usf.edu/context/geo_facpub/article/3254/viewcontent/449.pdf |
geographic |
Greenland |
geographic_facet |
Greenland |
genre |
glacier Greenland Ice Sheet |
genre_facet |
glacier Greenland Ice Sheet |
op_source |
School of Geosciences Faculty and Staff Publications |
op_relation |
https://digitalcommons.usf.edu/geo_facpub/2286 doi:10.1130/G45880.1 https://digitalcommons.usf.edu/context/geo_facpub/article/3254/viewcontent/449.pdf |
op_doi |
https://doi.org/10.1130/G45880.1 |
container_title |
Geology |
container_volume |
47 |
container_issue |
5 |
container_start_page |
449 |
op_container_end_page |
452 |
_version_ |
1772814660737695744 |