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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ftethz:oai:www.research-collection.ethz.ch:20.500.11850/91436 2023-05-15T15:04:27+02:00 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/application/pdf https://hdl.handle.net/20.500.11850/91436 https://doi.org/10.3929/ethz-b-000091436 en eng International Glaciological Society info:eu-repo/semantics/altIdentifier/doi/10.3189/2014JoG13J196 info:eu-repo/semantics/altIdentifier/wos/000343272100004 http://hdl.handle.net/20.500.11850/91436 doi:10.3929/ethz-b-000091436 info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by/4.0/ Creative Commons Attribution 4.0 International CC-BY Journal of Glaciology, 60 (222) Arctic glaciology Ice dynamics Ice rheology info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion 2014 ftethz https://doi.org/20.500.11850/91436 https://doi.org/10.3929/ethz-b-000091436 https://doi.org/10.3189/2014JoG13J196 2022-04-25T14:41:45Z 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. ISSN:0022-1430 ISSN:1727-5652 Article in Journal/Newspaper Arctic Greenland Ice Sheet Journal of Glaciology ETH Zürich Research Collection Arctic Greenland |
institution |
Open Polar |
collection |
ETH Zürich Research Collection |
op_collection_id |
ftethz |
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. ISSN:0022-1430 ISSN:1727-5652 |
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 |
International Glaciological Society |
publishDate |
2014 |
url |
https://hdl.handle.net/20.500.11850/91436 https://doi.org/10.3929/ethz-b-000091436 |
geographic |
Arctic Greenland |
geographic_facet |
Arctic Greenland |
genre |
Arctic Greenland Ice Sheet Journal of Glaciology |
genre_facet |
Arctic Greenland Ice Sheet Journal of Glaciology |
op_source |
Journal of Glaciology, 60 (222) |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.3189/2014JoG13J196 info:eu-repo/semantics/altIdentifier/wos/000343272100004 http://hdl.handle.net/20.500.11850/91436 doi:10.3929/ethz-b-000091436 |
op_rights |
info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by/4.0/ Creative Commons Attribution 4.0 International |
op_rightsnorm |
CC-BY |
op_doi |
https://doi.org/20.500.11850/91436 https://doi.org/10.3929/ethz-b-000091436 https://doi.org/10.3189/2014JoG13J196 |
_version_ |
1766336223649988608 |