Pattern-forming instabilities in the coupling of ice sheets and subglacial drainage systems ...
Sharp spatial changes discovered in the basal conditions of an ice sheet do not always have an obvious source. By modelling instabilities in the coupling of an ice sheet and subglacial drainage system, we describe physical feedback mechanisms that force the formation of sharp spatial structures in b...
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University of British Columbia
2018
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ftdatacite:10.14288/1.0366280 2024-04-28T08:24:40+00:00 Pattern-forming instabilities in the coupling of ice sheets and subglacial drainage systems ... Whiteford, Arran 2018 https://dx.doi.org/10.14288/1.0366280 https://doi.library.ubc.ca/10.14288/1.0366280 en eng University of British Columbia article-journal Text ScholarlyArticle 2018 ftdatacite https://doi.org/10.14288/1.0366280 2024-04-02T09:29:06Z Sharp spatial changes discovered in the basal conditions of an ice sheet do not always have an obvious source. By modelling instabilities in the coupling of an ice sheet and subglacial drainage system, we describe physical feedback mechanisms that force the formation of sharp spatial structures in basal conditions and ice flow. This model predicts the spontaneous formation of periodic subglacial `sticky spot'-lake pairs, that correspond in shape to previous empirical and modelled descriptions of similar structures. The instability that forms this structure is driven by a feedback whereby periodic humps in ice thickness redirect subglacial water to slippery spots that lie immediately downstream of the ice humps: the slippery regions increase ice flux into the ice humps, making them grow. Scaling a one-dimensional model ice sheet coupled to a basal drainage system, we find conditions for the instability with linear stability analysis. Solutions in the full nonlinear model are simulated numerically, using ... Text Ice Sheet DataCite Metadata Store (German National Library of Science and Technology) |
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DataCite Metadata Store (German National Library of Science and Technology) |
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English |
description |
Sharp spatial changes discovered in the basal conditions of an ice sheet do not always have an obvious source. By modelling instabilities in the coupling of an ice sheet and subglacial drainage system, we describe physical feedback mechanisms that force the formation of sharp spatial structures in basal conditions and ice flow. This model predicts the spontaneous formation of periodic subglacial `sticky spot'-lake pairs, that correspond in shape to previous empirical and modelled descriptions of similar structures. The instability that forms this structure is driven by a feedback whereby periodic humps in ice thickness redirect subglacial water to slippery spots that lie immediately downstream of the ice humps: the slippery regions increase ice flux into the ice humps, making them grow. Scaling a one-dimensional model ice sheet coupled to a basal drainage system, we find conditions for the instability with linear stability analysis. Solutions in the full nonlinear model are simulated numerically, using ... |
format |
Text |
author |
Whiteford, Arran |
spellingShingle |
Whiteford, Arran Pattern-forming instabilities in the coupling of ice sheets and subglacial drainage systems ... |
author_facet |
Whiteford, Arran |
author_sort |
Whiteford, Arran |
title |
Pattern-forming instabilities in the coupling of ice sheets and subglacial drainage systems ... |
title_short |
Pattern-forming instabilities in the coupling of ice sheets and subglacial drainage systems ... |
title_full |
Pattern-forming instabilities in the coupling of ice sheets and subglacial drainage systems ... |
title_fullStr |
Pattern-forming instabilities in the coupling of ice sheets and subglacial drainage systems ... |
title_full_unstemmed |
Pattern-forming instabilities in the coupling of ice sheets and subglacial drainage systems ... |
title_sort |
pattern-forming instabilities in the coupling of ice sheets and subglacial drainage systems ... |
publisher |
University of British Columbia |
publishDate |
2018 |
url |
https://dx.doi.org/10.14288/1.0366280 https://doi.library.ubc.ca/10.14288/1.0366280 |
genre |
Ice Sheet |
genre_facet |
Ice Sheet |
op_doi |
https://doi.org/10.14288/1.0366280 |
_version_ |
1797584806905643008 |