Terminus Geometry as Main Control on Outlet Glacier Velocity
Ice flow velocities close to the terminus of major outlet glaciers of the Greenland Ice Sheet can vary on the time scale of years to hours. Such flow speed variations can be explained as the reaction to changes in terminus geometry with help of a 3D full-Stokes ice flow model. Starting from an initi...
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ftdatacite:10.48550/arxiv.1902.03566 2023-05-15T16:21:17+02:00 Terminus Geometry as Main Control on Outlet Glacier Velocity Lüthi, Martin Peter 2019 https://dx.doi.org/10.48550/arxiv.1902.03566 https://arxiv.org/abs/1902.03566 unknown arXiv Creative Commons Attribution 4.0 International https://creativecommons.org/licenses/by/4.0/legalcode cc-by-4.0 CC-BY Geophysics physics.geo-ph FOS Physical sciences Preprint Article article CreativeWork 2019 ftdatacite https://doi.org/10.48550/arxiv.1902.03566 2022-04-01T08:40:54Z Ice flow velocities close to the terminus of major outlet glaciers of the Greenland Ice Sheet can vary on the time scale of years to hours. Such flow speed variations can be explained as the reaction to changes in terminus geometry with help of a 3D full-Stokes ice flow model. Starting from an initial steady state geometry, parts of an initially 7 km long floating terminus are removed. Flow velocity increases everywhere up to 4 km upstream of the grounding line, and complete removal of the floating terminus leads to a doubling of flow speed. The model results conclusively show that the observed velocity variations of outlet glaciers is dominated by the terminus geometry. Since terminus geometry is mainly controlled by calving processes and melting under the floating portion, changing ocean conditions most probably have triggered the recent geometry and velocity variations of Greenland outlet glaciers. Report glacier Greenland Ice Sheet DataCite Metadata Store (German National Library of Science and Technology) Greenland |
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Open Polar |
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DataCite Metadata Store (German National Library of Science and Technology) |
op_collection_id |
ftdatacite |
language |
unknown |
topic |
Geophysics physics.geo-ph FOS Physical sciences |
spellingShingle |
Geophysics physics.geo-ph FOS Physical sciences Lüthi, Martin Peter Terminus Geometry as Main Control on Outlet Glacier Velocity |
topic_facet |
Geophysics physics.geo-ph FOS Physical sciences |
description |
Ice flow velocities close to the terminus of major outlet glaciers of the Greenland Ice Sheet can vary on the time scale of years to hours. Such flow speed variations can be explained as the reaction to changes in terminus geometry with help of a 3D full-Stokes ice flow model. Starting from an initial steady state geometry, parts of an initially 7 km long floating terminus are removed. Flow velocity increases everywhere up to 4 km upstream of the grounding line, and complete removal of the floating terminus leads to a doubling of flow speed. The model results conclusively show that the observed velocity variations of outlet glaciers is dominated by the terminus geometry. Since terminus geometry is mainly controlled by calving processes and melting under the floating portion, changing ocean conditions most probably have triggered the recent geometry and velocity variations of Greenland outlet glaciers. |
format |
Report |
author |
Lüthi, Martin Peter |
author_facet |
Lüthi, Martin Peter |
author_sort |
Lüthi, Martin Peter |
title |
Terminus Geometry as Main Control on Outlet Glacier Velocity |
title_short |
Terminus Geometry as Main Control on Outlet Glacier Velocity |
title_full |
Terminus Geometry as Main Control on Outlet Glacier Velocity |
title_fullStr |
Terminus Geometry as Main Control on Outlet Glacier Velocity |
title_full_unstemmed |
Terminus Geometry as Main Control on Outlet Glacier Velocity |
title_sort |
terminus geometry as main control on outlet glacier velocity |
publisher |
arXiv |
publishDate |
2019 |
url |
https://dx.doi.org/10.48550/arxiv.1902.03566 https://arxiv.org/abs/1902.03566 |
geographic |
Greenland |
geographic_facet |
Greenland |
genre |
glacier Greenland Ice Sheet |
genre_facet |
glacier Greenland Ice Sheet |
op_rights |
Creative Commons Attribution 4.0 International https://creativecommons.org/licenses/by/4.0/legalcode cc-by-4.0 |
op_rightsnorm |
CC-BY |
op_doi |
https://doi.org/10.48550/arxiv.1902.03566 |
_version_ |
1766009297380048896 |