Overturned folds in ice sheets: Insights from a kinematic model of traveling sticky patches and comparisons with observations ...
Overturned folds are observed in regions of the Greenland ice sheet where driving stress is highly variable. Three mechanisms have been proposed to explain these folds: freezing subglacial water, traveling basal slippery patches, and englacial rheological contrasts. Here we explore how traveling bas...
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Columbia University
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Online Access: | https://dx.doi.org/10.7916/d8mw2h7p https://academiccommons.columbia.edu/doi/10.7916/D8MW2H7P |
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ftdatacite:10.7916/d8mw2h7p 2024-10-20T14:09:09+00:00 Overturned folds in ice sheets: Insights from a kinematic model of traveling sticky patches and comparisons with observations ... Wolovick, Michael J. Creyts, Timothy T. 2016 https://dx.doi.org/10.7916/d8mw2h7p https://academiccommons.columbia.edu/doi/10.7916/D8MW2H7P unknown Columbia University https://dx.doi.org/10.1002/2015jf003698 Ice--Dynamics Formations Geology Ice sheets Geophysics FOS: Earth and related environmental sciences Physical geography Text article-journal Articles ScholarlyArticle 2016 ftdatacite https://doi.org/10.7916/d8mw2h7p10.1002/2015jf003698 2024-10-01T11:40:10Z Overturned folds are observed in regions of the Greenland ice sheet where driving stress is highly variable. Three mechanisms have been proposed to explain these folds: freezing subglacial water, traveling basal slippery patches, and englacial rheological contrasts. Here we explore how traveling basal sticky patches can produce overturned folds. Transitions from low to high stress cause a tradeoff in ice flow between basal slip and internal deformation that deflects ice stratigraphy vertically. If these transitions move, the slip-deformation tradeoff can produce large folds. Those folds record the integrated effects of time-varying basal slip. To understand how dynamic changes in basal slip influence ice sheet stratigraphy, we develop a kinematic model of ice flow in a moving reference frame that follows a single traveling sticky patch. The ice flow field forms a vortex when viewed in the moving reference frame, and this vortex traps ice above the traveling patch and produces overturned folds. Sticky patches ... Article in Journal/Newspaper Greenland Ice Sheet DataCite Greenland |
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Open Polar |
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DataCite |
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language |
unknown |
topic |
Ice--Dynamics Formations Geology Ice sheets Geophysics FOS: Earth and related environmental sciences Physical geography |
spellingShingle |
Ice--Dynamics Formations Geology Ice sheets Geophysics FOS: Earth and related environmental sciences Physical geography Wolovick, Michael J. Creyts, Timothy T. Overturned folds in ice sheets: Insights from a kinematic model of traveling sticky patches and comparisons with observations ... |
topic_facet |
Ice--Dynamics Formations Geology Ice sheets Geophysics FOS: Earth and related environmental sciences Physical geography |
description |
Overturned folds are observed in regions of the Greenland ice sheet where driving stress is highly variable. Three mechanisms have been proposed to explain these folds: freezing subglacial water, traveling basal slippery patches, and englacial rheological contrasts. Here we explore how traveling basal sticky patches can produce overturned folds. Transitions from low to high stress cause a tradeoff in ice flow between basal slip and internal deformation that deflects ice stratigraphy vertically. If these transitions move, the slip-deformation tradeoff can produce large folds. Those folds record the integrated effects of time-varying basal slip. To understand how dynamic changes in basal slip influence ice sheet stratigraphy, we develop a kinematic model of ice flow in a moving reference frame that follows a single traveling sticky patch. The ice flow field forms a vortex when viewed in the moving reference frame, and this vortex traps ice above the traveling patch and produces overturned folds. Sticky patches ... |
format |
Article in Journal/Newspaper |
author |
Wolovick, Michael J. Creyts, Timothy T. |
author_facet |
Wolovick, Michael J. Creyts, Timothy T. |
author_sort |
Wolovick, Michael J. |
title |
Overturned folds in ice sheets: Insights from a kinematic model of traveling sticky patches and comparisons with observations ... |
title_short |
Overturned folds in ice sheets: Insights from a kinematic model of traveling sticky patches and comparisons with observations ... |
title_full |
Overturned folds in ice sheets: Insights from a kinematic model of traveling sticky patches and comparisons with observations ... |
title_fullStr |
Overturned folds in ice sheets: Insights from a kinematic model of traveling sticky patches and comparisons with observations ... |
title_full_unstemmed |
Overturned folds in ice sheets: Insights from a kinematic model of traveling sticky patches and comparisons with observations ... |
title_sort |
overturned folds in ice sheets: insights from a kinematic model of traveling sticky patches and comparisons with observations ... |
publisher |
Columbia University |
publishDate |
2016 |
url |
https://dx.doi.org/10.7916/d8mw2h7p https://academiccommons.columbia.edu/doi/10.7916/D8MW2H7P |
geographic |
Greenland |
geographic_facet |
Greenland |
genre |
Greenland Ice Sheet |
genre_facet |
Greenland Ice Sheet |
op_relation |
https://dx.doi.org/10.1002/2015jf003698 |
op_doi |
https://doi.org/10.7916/d8mw2h7p10.1002/2015jf003698 |
_version_ |
1813448600851578880 |