Sustained high basal motion of the Greenland ice sheet revealed by borehole deformation ...
Ice deformation and basal motion characterize the dynamical behavior of the Greenland ice sheet (GrIS). We evaluate the contribution of basal motion from ice deformation measurements in boreholes drilled to the bed at two sites in the western marginal zone of the GrIS. We find a sustained high amoun...
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ftdatacite:10.3929/ethz-b-000091436 2024-04-28T08:10:23+00:00 Sustained high basal motion of the Greenland ice sheet revealed by borehole deformation ... Ryser, Claudia Lüthi, Martin P. Andrews, Lauren C. Hoffman, Matthew J. Catania, Ginny A. Hawley, Robert L. Neumann, Thomas A. Kristensen, Steen S. 2014 application/pdf https://dx.doi.org/10.3929/ethz-b-000091436 http://hdl.handle.net/20.500.11850/91436 en eng ETH Zurich info:eu-repo/semantics/openAccess Creative Commons Attribution 4.0 International https://creativecommons.org/licenses/by/4.0/legalcode cc-by-4.0 Arctic glaciology Ice dynamics Ice rheology article-journal Text ScholarlyArticle Journal Article 2014 ftdatacite https://doi.org/10.3929/ethz-b-000091436 2024-04-02T12:34:54Z Ice deformation and basal motion characterize the dynamical behavior of the Greenland ice sheet (GrIS). We evaluate the contribution of basal motion from ice deformation measurements in boreholes drilled to the bed at two sites in the western marginal zone of the GrIS. We find a sustained high amount of basal motion contribution to surface velocity of 44–73% in winter, and up to 90% in summer. Measured ice deformation rates show an unexpected variation with depth that can be explained with the help of an ice-flow model as a consequence of stress transfer from slippery to sticky areas. This effect necessitates the use of high-order ice-flow models, not only in regions of fast-flowing ice streams but in all temperate-based areas of the GrIS. The agreement between modeled and measured deformation rates confirms that the recommended values of the temperature-dependent flow rate factor A are a good choice for ice-sheet models. ... : Journal of Glaciology, 60 (222) ... Article in Journal/Newspaper Arctic Greenland Ice Sheet DataCite Metadata Store (German National Library of Science and Technology) |
institution |
Open Polar |
collection |
DataCite Metadata Store (German National Library of Science and Technology) |
op_collection_id |
ftdatacite |
language |
English |
topic |
Arctic glaciology Ice dynamics Ice rheology |
spellingShingle |
Arctic glaciology Ice dynamics Ice rheology Ryser, Claudia Lüthi, Martin P. Andrews, Lauren C. Hoffman, Matthew J. Catania, Ginny A. Hawley, Robert L. Neumann, Thomas A. Kristensen, Steen S. Sustained high basal motion of the Greenland ice sheet revealed by borehole deformation ... |
topic_facet |
Arctic glaciology Ice dynamics Ice rheology |
description |
Ice deformation and basal motion characterize the dynamical behavior of the Greenland ice sheet (GrIS). We evaluate the contribution of basal motion from ice deformation measurements in boreholes drilled to the bed at two sites in the western marginal zone of the GrIS. We find a sustained high amount of basal motion contribution to surface velocity of 44–73% in winter, and up to 90% in summer. Measured ice deformation rates show an unexpected variation with depth that can be explained with the help of an ice-flow model as a consequence of stress transfer from slippery to sticky areas. This effect necessitates the use of high-order ice-flow models, not only in regions of fast-flowing ice streams but in all temperate-based areas of the GrIS. The agreement between modeled and measured deformation rates confirms that the recommended values of the temperature-dependent flow rate factor A are a good choice for ice-sheet models. ... : Journal of Glaciology, 60 (222) ... |
format |
Article in Journal/Newspaper |
author |
Ryser, Claudia Lüthi, Martin P. Andrews, Lauren C. Hoffman, Matthew J. Catania, Ginny A. Hawley, Robert L. Neumann, Thomas A. Kristensen, Steen S. |
author_facet |
Ryser, Claudia Lüthi, Martin P. Andrews, Lauren C. Hoffman, Matthew J. Catania, Ginny A. Hawley, Robert L. Neumann, Thomas A. Kristensen, Steen S. |
author_sort |
Ryser, Claudia |
title |
Sustained high basal motion of the Greenland ice sheet revealed by borehole deformation ... |
title_short |
Sustained high basal motion of the Greenland ice sheet revealed by borehole deformation ... |
title_full |
Sustained high basal motion of the Greenland ice sheet revealed by borehole deformation ... |
title_fullStr |
Sustained high basal motion of the Greenland ice sheet revealed by borehole deformation ... |
title_full_unstemmed |
Sustained high basal motion of the Greenland ice sheet revealed by borehole deformation ... |
title_sort |
sustained high basal motion of the greenland ice sheet revealed by borehole deformation ... |
publisher |
ETH Zurich |
publishDate |
2014 |
url |
https://dx.doi.org/10.3929/ethz-b-000091436 http://hdl.handle.net/20.500.11850/91436 |
genre |
Arctic Greenland Ice Sheet |
genre_facet |
Arctic Greenland Ice Sheet |
op_rights |
info:eu-repo/semantics/openAccess Creative Commons Attribution 4.0 International https://creativecommons.org/licenses/by/4.0/legalcode cc-by-4.0 |
op_doi |
https://doi.org/10.3929/ethz-b-000091436 |
_version_ |
1797578290007900160 |