An analysis of the interaction between surface and basal crevasses in ice shelves
The prescription of a simple and robust parameterization for calving is one of the most significant open problems in ice sheet modelling. One common approach to modelling of crevasse propagation in calving in ice shelves has been to view crevasse growth as an example of linear elastic fracture mecha...
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ftcopernicus:oai:publications.copernicus.org:egusphere112156 2023-07-16T03:59:03+02:00 An analysis of the interaction between surface and basal crevasses in ice shelves Zarrinderakht, Maryam Schoof, Christian Peirce, Anthony 2023-06-21 application/pdf https://doi.org/10.5194/egusphere-2023-1252 https://egusphere.copernicus.org/preprints/2023/egusphere-2023-1252/ eng eng doi:10.5194/egusphere-2023-1252 https://egusphere.copernicus.org/preprints/2023/egusphere-2023-1252/ eISSN: Text 2023 ftcopernicus https://doi.org/10.5194/egusphere-2023-1252 2023-06-26T16:24:19Z The prescription of a simple and robust parameterization for calving is one of the most significant open problems in ice sheet modelling. One common approach to modelling of crevasse propagation in calving in ice shelves has been to view crevasse growth as an example of linear elastic fracture mechanics. Prior work has however focused on highly idealized crack geometries, with a single fracture incised into a parallel-sided slab of ice. In this paper, we study how fractures growing from opposite sides of such an ice slab interact with each other, focusing on different simple crack arrangements: we consider either perfectly aligned cracks, or periodic arrays of laterally offset cracks. We visualize the dynamics of crack growth using simple tools from dynamical systems theory, and find that aligned cracks tend to impede each other's growth due to the torques generated by normal stresses on the crack faces, while periodically offset facilitate simultaneous growth of bottom and top cracks. For periodic cracks, the presence of multiple cracks on one side of the ice slab however also generates torques that slow crack growth, with widely spaced cracks favouring calving at lower extensional stresses than closely spaced cracks. Text Ice Sheet Ice Shelves Copernicus Publications: E-Journals |
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Open Polar |
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Copernicus Publications: E-Journals |
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ftcopernicus |
language |
English |
description |
The prescription of a simple and robust parameterization for calving is one of the most significant open problems in ice sheet modelling. One common approach to modelling of crevasse propagation in calving in ice shelves has been to view crevasse growth as an example of linear elastic fracture mechanics. Prior work has however focused on highly idealized crack geometries, with a single fracture incised into a parallel-sided slab of ice. In this paper, we study how fractures growing from opposite sides of such an ice slab interact with each other, focusing on different simple crack arrangements: we consider either perfectly aligned cracks, or periodic arrays of laterally offset cracks. We visualize the dynamics of crack growth using simple tools from dynamical systems theory, and find that aligned cracks tend to impede each other's growth due to the torques generated by normal stresses on the crack faces, while periodically offset facilitate simultaneous growth of bottom and top cracks. For periodic cracks, the presence of multiple cracks on one side of the ice slab however also generates torques that slow crack growth, with widely spaced cracks favouring calving at lower extensional stresses than closely spaced cracks. |
format |
Text |
author |
Zarrinderakht, Maryam Schoof, Christian Peirce, Anthony |
spellingShingle |
Zarrinderakht, Maryam Schoof, Christian Peirce, Anthony An analysis of the interaction between surface and basal crevasses in ice shelves |
author_facet |
Zarrinderakht, Maryam Schoof, Christian Peirce, Anthony |
author_sort |
Zarrinderakht, Maryam |
title |
An analysis of the interaction between surface and basal crevasses in ice shelves |
title_short |
An analysis of the interaction between surface and basal crevasses in ice shelves |
title_full |
An analysis of the interaction between surface and basal crevasses in ice shelves |
title_fullStr |
An analysis of the interaction between surface and basal crevasses in ice shelves |
title_full_unstemmed |
An analysis of the interaction between surface and basal crevasses in ice shelves |
title_sort |
analysis of the interaction between surface and basal crevasses in ice shelves |
publishDate |
2023 |
url |
https://doi.org/10.5194/egusphere-2023-1252 https://egusphere.copernicus.org/preprints/2023/egusphere-2023-1252/ |
genre |
Ice Sheet Ice Shelves |
genre_facet |
Ice Sheet Ice Shelves |
op_source |
eISSN: |
op_relation |
doi:10.5194/egusphere-2023-1252 https://egusphere.copernicus.org/preprints/2023/egusphere-2023-1252/ |
op_doi |
https://doi.org/10.5194/egusphere-2023-1252 |
_version_ |
1771546495321899008 |