Calving relation for tidewater glaciers based on detailed stress field analysis
Ocean-terminating glaciers in Arctic regions have undergone rapid dynamic changes in recent years, which have been related to a dramatic increase in calving rates. Iceberg calving is a dynamical process strongly influenced by the geometry at the terminus of tidewater glaciers. We investigate the eff...
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Copernicus Publications
2018
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Online Access: | https://doi.org/10.5194/tc-12-721-2018 https://www.the-cryosphere.net/12/721/2018/tc-12-721-2018.pdf https://doaj.org/article/ce23a4db222c4bcf9a6300bd2b747339 |
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fttriple:oai:gotriple.eu:oai:doaj.org/article:ce23a4db222c4bcf9a6300bd2b747339 2023-05-15T15:06:43+02:00 Calving relation for tidewater glaciers based on detailed stress field analysis R. Mercenier M. P. Lüthi A. Vieli 2018-02-01 https://doi.org/10.5194/tc-12-721-2018 https://www.the-cryosphere.net/12/721/2018/tc-12-721-2018.pdf https://doaj.org/article/ce23a4db222c4bcf9a6300bd2b747339 en eng Copernicus Publications doi:10.5194/tc-12-721-2018 1994-0416 1994-0424 https://www.the-cryosphere.net/12/721/2018/tc-12-721-2018.pdf https://doaj.org/article/ce23a4db222c4bcf9a6300bd2b747339 undefined The Cryosphere, Vol 12, Pp 721-739 (2018) geo envir Journal Article https://vocabularies.coar-repositories.org/resource_types/c_6501/ 2018 fttriple https://doi.org/10.5194/tc-12-721-2018 2023-01-22T19:30:52Z Ocean-terminating glaciers in Arctic regions have undergone rapid dynamic changes in recent years, which have been related to a dramatic increase in calving rates. Iceberg calving is a dynamical process strongly influenced by the geometry at the terminus of tidewater glaciers. We investigate the effect of varying water level, calving front slope and basal sliding on the state of stress and flow regime for an idealized grounded ocean-terminating glacier and scale these results with ice thickness and velocity. Results show that water depth and calving front slope strongly affect the stress state while the effect from spatially uniform variations in basal sliding is much smaller. An increased relative water level or a reclining calving front slope strongly decrease the stresses and velocities in the vicinity of the terminus and hence have a stabilizing effect on the calving front. We find that surface stress magnitude and distribution for simple geometries are determined solely by the water depth relative to ice thickness. Based on this scaled relationship for the stress peak at the surface, and assuming a critical stress for damage initiation, we propose a simple and new parametrization for calving rates for grounded tidewater glaciers that is calibrated with observations. Article in Journal/Newspaper Arctic Iceberg* The Cryosphere Tidewater Unknown Arctic The Cryosphere 12 2 721 739 |
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English |
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geo envir |
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geo envir R. Mercenier M. P. Lüthi A. Vieli Calving relation for tidewater glaciers based on detailed stress field analysis |
topic_facet |
geo envir |
description |
Ocean-terminating glaciers in Arctic regions have undergone rapid dynamic changes in recent years, which have been related to a dramatic increase in calving rates. Iceberg calving is a dynamical process strongly influenced by the geometry at the terminus of tidewater glaciers. We investigate the effect of varying water level, calving front slope and basal sliding on the state of stress and flow regime for an idealized grounded ocean-terminating glacier and scale these results with ice thickness and velocity. Results show that water depth and calving front slope strongly affect the stress state while the effect from spatially uniform variations in basal sliding is much smaller. An increased relative water level or a reclining calving front slope strongly decrease the stresses and velocities in the vicinity of the terminus and hence have a stabilizing effect on the calving front. We find that surface stress magnitude and distribution for simple geometries are determined solely by the water depth relative to ice thickness. Based on this scaled relationship for the stress peak at the surface, and assuming a critical stress for damage initiation, we propose a simple and new parametrization for calving rates for grounded tidewater glaciers that is calibrated with observations. |
format |
Article in Journal/Newspaper |
author |
R. Mercenier M. P. Lüthi A. Vieli |
author_facet |
R. Mercenier M. P. Lüthi A. Vieli |
author_sort |
R. Mercenier |
title |
Calving relation for tidewater glaciers based on detailed stress field analysis |
title_short |
Calving relation for tidewater glaciers based on detailed stress field analysis |
title_full |
Calving relation for tidewater glaciers based on detailed stress field analysis |
title_fullStr |
Calving relation for tidewater glaciers based on detailed stress field analysis |
title_full_unstemmed |
Calving relation for tidewater glaciers based on detailed stress field analysis |
title_sort |
calving relation for tidewater glaciers based on detailed stress field analysis |
publisher |
Copernicus Publications |
publishDate |
2018 |
url |
https://doi.org/10.5194/tc-12-721-2018 https://www.the-cryosphere.net/12/721/2018/tc-12-721-2018.pdf https://doaj.org/article/ce23a4db222c4bcf9a6300bd2b747339 |
geographic |
Arctic |
geographic_facet |
Arctic |
genre |
Arctic Iceberg* The Cryosphere Tidewater |
genre_facet |
Arctic Iceberg* The Cryosphere Tidewater |
op_source |
The Cryosphere, Vol 12, Pp 721-739 (2018) |
op_relation |
doi:10.5194/tc-12-721-2018 1994-0416 1994-0424 https://www.the-cryosphere.net/12/721/2018/tc-12-721-2018.pdf https://doaj.org/article/ce23a4db222c4bcf9a6300bd2b747339 |
op_rights |
undefined |
op_doi |
https://doi.org/10.5194/tc-12-721-2018 |
container_title |
The Cryosphere |
container_volume |
12 |
container_issue |
2 |
container_start_page |
721 |
op_container_end_page |
739 |
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1766338279413645312 |