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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International Glaciological Society
2014
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ftunivzuerich:oai:www.zora.uzh.ch:101718 2024-05-12T08:04:27+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://www.zora.uzh.ch/id/eprint/101718/ https://www.zora.uzh.ch/id/eprint/101718/1/2014%20L%C3%BCthiM_s4%20.pdf https://doi.org/10.5167/uzh-101718 https://doi.org/10.3189/2014JoG13J196 eng eng International Glaciological Society https://www.zora.uzh.ch/id/eprint/101718/1/2014%20L%C3%BCthiM_s4%20.pdf doi:10.5167/uzh-101718 doi:10.3189/2014JoG13J196 urn:issn:0022-1430 info:eu-repo/semantics/openAccess Ryser, Claudia; Lüthi, Martin P; Andrews, Lauren C; Hoffman, Matthew J; Catania, Ginny A; Hawley, Robert L; Neumann, Thomas A; Kristensen, Steen S (2014). Sustained high basal motion of the Greenland ice sheet revealed by borehole deformation. Journal of Glaciology, 60(222):647-660. Institute of Geography 910 Geography & travel Journal Article PeerReviewed info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion 2014 ftunivzuerich https://doi.org/10.5167/uzh-10171810.3189/2014JoG13J196 2024-04-17T15:17:43Z 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. Article in Journal/Newspaper Greenland Ice Sheet Journal of Glaciology University of Zurich (UZH): ZORA (Zurich Open Repository and Archive Greenland |
institution |
Open Polar |
collection |
University of Zurich (UZH): ZORA (Zurich Open Repository and Archive |
op_collection_id |
ftunivzuerich |
language |
English |
topic |
Institute of Geography 910 Geography & travel |
spellingShingle |
Institute of Geography 910 Geography & travel 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 |
Institute of Geography 910 Geography & travel |
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. |
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://www.zora.uzh.ch/id/eprint/101718/ https://www.zora.uzh.ch/id/eprint/101718/1/2014%20L%C3%BCthiM_s4%20.pdf https://doi.org/10.5167/uzh-101718 https://doi.org/10.3189/2014JoG13J196 |
geographic |
Greenland |
geographic_facet |
Greenland |
genre |
Greenland Ice Sheet Journal of Glaciology |
genre_facet |
Greenland Ice Sheet Journal of Glaciology |
op_source |
Ryser, Claudia; Lüthi, Martin P; Andrews, Lauren C; Hoffman, Matthew J; Catania, Ginny A; Hawley, Robert L; Neumann, Thomas A; Kristensen, Steen S (2014). Sustained high basal motion of the Greenland ice sheet revealed by borehole deformation. Journal of Glaciology, 60(222):647-660. |
op_relation |
https://www.zora.uzh.ch/id/eprint/101718/1/2014%20L%C3%BCthiM_s4%20.pdf doi:10.5167/uzh-101718 doi:10.3189/2014JoG13J196 urn:issn:0022-1430 |
op_rights |
info:eu-repo/semantics/openAccess |
op_doi |
https://doi.org/10.5167/uzh-10171810.3189/2014JoG13J196 |
_version_ |
1798846666916233216 |