The effect of buttressing on grounding line dynamics

Determining the position and stability of the grounding line of a marine ice sheet is a major challenge for ice-sheet models. Here, we investigate the role of lateral shear and ice-shelf buttressing in grounding line dynamics by extending an existing boundary layer theory to laterally confined marin...

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Published in:Journal of Glaciology
Main Authors: Haseloff, M, Sergienko, O
Format: Article in Journal/Newspaper
Language:unknown
Published: Cambridge University Press 2018
Subjects:
Online Access:https://doi.org/10.1017/jog.2018.30
https://ora.ox.ac.uk/objects/uuid:23aeb41f-9f12-435a-ba7a-747c1817c7d6
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spelling ftuloxford:oai:ora.ox.ac.uk:uuid:23aeb41f-9f12-435a-ba7a-747c1817c7d6 2023-05-15T16:40:14+02:00 The effect of buttressing on grounding line dynamics Haseloff, M Sergienko, O 2018-05-11 https://doi.org/10.1017/jog.2018.30 https://ora.ox.ac.uk/objects/uuid:23aeb41f-9f12-435a-ba7a-747c1817c7d6 unknown Cambridge University Press doi:10.1017/jog.2018.30 https://ora.ox.ac.uk/objects/uuid:23aeb41f-9f12-435a-ba7a-747c1817c7d6 https://doi.org/10.1017/jog.2018.30 info:eu-repo/semantics/openAccess CC Attribution (CC BY) CC-BY Journal article 2018 ftuloxford https://doi.org/10.1017/jog.2018.30 2022-06-28T20:07:52Z Determining the position and stability of the grounding line of a marine ice sheet is a major challenge for ice-sheet models. Here, we investigate the role of lateral shear and ice-shelf buttressing in grounding line dynamics by extending an existing boundary layer theory to laterally confined marine ice sheets. We derive an analytic expression for the ice flux at the grounding line of confined marine ice sheets that depends on both local bed properties and non-local ice-shelf properties. Application of these results to a laterally confined version of the MISMIP 1a experiment shows that the boundary condition at the ice-shelf front (i.e. the calving law) is a major control on the location and stability of the grounding line in the presence of buttressing, allowing for both stable and unstable grounding line positions on downwards sloping beds. These results corroborate the findings of existing numerical studies that the stability of confined marine ice sheets is influenced by ice-shelf properties, in contrast to unconfined configurations where grounding line stability is solely determined by the local slope of the bed. Consequently, the marine ice-sheet instability hypothesis may not apply to buttressed marine ice sheets. Article in Journal/Newspaper Ice Sheet Ice Shelf ORA - Oxford University Research Archive Journal of Glaciology 64 245 417 431
institution Open Polar
collection ORA - Oxford University Research Archive
op_collection_id ftuloxford
language unknown
description Determining the position and stability of the grounding line of a marine ice sheet is a major challenge for ice-sheet models. Here, we investigate the role of lateral shear and ice-shelf buttressing in grounding line dynamics by extending an existing boundary layer theory to laterally confined marine ice sheets. We derive an analytic expression for the ice flux at the grounding line of confined marine ice sheets that depends on both local bed properties and non-local ice-shelf properties. Application of these results to a laterally confined version of the MISMIP 1a experiment shows that the boundary condition at the ice-shelf front (i.e. the calving law) is a major control on the location and stability of the grounding line in the presence of buttressing, allowing for both stable and unstable grounding line positions on downwards sloping beds. These results corroborate the findings of existing numerical studies that the stability of confined marine ice sheets is influenced by ice-shelf properties, in contrast to unconfined configurations where grounding line stability is solely determined by the local slope of the bed. Consequently, the marine ice-sheet instability hypothesis may not apply to buttressed marine ice sheets.
format Article in Journal/Newspaper
author Haseloff, M
Sergienko, O
spellingShingle Haseloff, M
Sergienko, O
The effect of buttressing on grounding line dynamics
author_facet Haseloff, M
Sergienko, O
author_sort Haseloff, M
title The effect of buttressing on grounding line dynamics
title_short The effect of buttressing on grounding line dynamics
title_full The effect of buttressing on grounding line dynamics
title_fullStr The effect of buttressing on grounding line dynamics
title_full_unstemmed The effect of buttressing on grounding line dynamics
title_sort effect of buttressing on grounding line dynamics
publisher Cambridge University Press
publishDate 2018
url https://doi.org/10.1017/jog.2018.30
https://ora.ox.ac.uk/objects/uuid:23aeb41f-9f12-435a-ba7a-747c1817c7d6
genre Ice Sheet
Ice Shelf
genre_facet Ice Sheet
Ice Shelf
op_relation doi:10.1017/jog.2018.30
https://ora.ox.ac.uk/objects/uuid:23aeb41f-9f12-435a-ba7a-747c1817c7d6
https://doi.org/10.1017/jog.2018.30
op_rights info:eu-repo/semantics/openAccess
CC Attribution (CC BY)
op_rightsnorm CC-BY
op_doi https://doi.org/10.1017/jog.2018.30
container_title Journal of Glaciology
container_volume 64
container_issue 245
container_start_page 417
op_container_end_page 431
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