Widespread moulin formation during supraglacial lake drainages in Greenland
Moulins permit access of surface meltwater to the glacier bed, causing basal lubrication and ice speedup in the ablation zone of western Greenland during summer. Despite the substantial impact of moulins on ice dynamics, the conditions under which they form are poorly understood. We assimilate a tim...
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American Geophysical Union
2018
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ftunivzuerich:oai:www.zora.uzh.ch:162834 2024-10-13T14:07:26+00:00 Widespread moulin formation during supraglacial lake drainages in Greenland Hoffman, Matthew J Perego, Mauro Andrews, Lauren C Price, Stephen F Neumann, Thomas A Johnson, Jesse V Catania, Ginny Lüthi, Martin P 2018-01-28 application/pdf https://www.zora.uzh.ch/id/eprint/162834/ https://www.zora.uzh.ch/id/eprint/162834/1/2018_Hoffman%26al2018.pdf https://doi.org/10.1002/2017gl075659 eng eng American Geophysical Union https://www.zora.uzh.ch/id/eprint/162834/1/2018_Hoffman%26al2018.pdf doi:10.5167/uzh-162834 doi:10.1002/2017gl075659 urn:issn:0094-8276 info:eu-repo/semantics/openAccess Creative Commons: Attribution-NonCommercial-NoDerivatives 4.0 International (CC BY-NC-ND 4.0) http://creativecommons.org/licenses/by-nc-nd/4.0/ Hoffman, Matthew J; Perego, Mauro; Andrews, Lauren C; Price, Stephen F; Neumann, Thomas A; Johnson, Jesse V; Catania, Ginny; Lüthi, Martin P (2018). Widespread moulin formation during supraglacial lake drainages in Greenland. Geophysical Research Letters, 45(2):778-788. Institute of Geography 910 Geography & travel General Earth and Planetary Sciences Geophysics Journal Article PeerReviewed info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion 2018 ftunivzuerich https://doi.org/10.1002/2017gl07565910.5167/uzh-162834 2024-09-25T00:59:10Z Moulins permit access of surface meltwater to the glacier bed, causing basal lubrication and ice speedup in the ablation zone of western Greenland during summer. Despite the substantial impact of moulins on ice dynamics, the conditions under which they form are poorly understood. We assimilate a time series of ice surface velocity from a network of eleven Global Positioning System receivers into an ice sheet model to estimate ice sheet stresses during winter, spring, and summer in a ∼30 × 10 km region. Surface-parallel von Mises stress increases slightly during spring speedup and early summer, sufficient to allow formation of 16% of moulins mapped in the study area. In contrast, 63% of mourns experience stresses over the tensile strength of ice during a short (hours) supraglacial lake drainage event. Lake drainages appear to control moulin density, which is itself a control on subglacial drainage efficiency and summer ice velocities. Article in Journal/Newspaper glacier Greenland Ice Sheet 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 General Earth and Planetary Sciences Geophysics |
spellingShingle |
Institute of Geography 910 Geography & travel General Earth and Planetary Sciences Geophysics Hoffman, Matthew J Perego, Mauro Andrews, Lauren C Price, Stephen F Neumann, Thomas A Johnson, Jesse V Catania, Ginny Lüthi, Martin P Widespread moulin formation during supraglacial lake drainages in Greenland |
topic_facet |
Institute of Geography 910 Geography & travel General Earth and Planetary Sciences Geophysics |
description |
Moulins permit access of surface meltwater to the glacier bed, causing basal lubrication and ice speedup in the ablation zone of western Greenland during summer. Despite the substantial impact of moulins on ice dynamics, the conditions under which they form are poorly understood. We assimilate a time series of ice surface velocity from a network of eleven Global Positioning System receivers into an ice sheet model to estimate ice sheet stresses during winter, spring, and summer in a ∼30 × 10 km region. Surface-parallel von Mises stress increases slightly during spring speedup and early summer, sufficient to allow formation of 16% of moulins mapped in the study area. In contrast, 63% of mourns experience stresses over the tensile strength of ice during a short (hours) supraglacial lake drainage event. Lake drainages appear to control moulin density, which is itself a control on subglacial drainage efficiency and summer ice velocities. |
format |
Article in Journal/Newspaper |
author |
Hoffman, Matthew J Perego, Mauro Andrews, Lauren C Price, Stephen F Neumann, Thomas A Johnson, Jesse V Catania, Ginny Lüthi, Martin P |
author_facet |
Hoffman, Matthew J Perego, Mauro Andrews, Lauren C Price, Stephen F Neumann, Thomas A Johnson, Jesse V Catania, Ginny Lüthi, Martin P |
author_sort |
Hoffman, Matthew J |
title |
Widespread moulin formation during supraglacial lake drainages in Greenland |
title_short |
Widespread moulin formation during supraglacial lake drainages in Greenland |
title_full |
Widespread moulin formation during supraglacial lake drainages in Greenland |
title_fullStr |
Widespread moulin formation during supraglacial lake drainages in Greenland |
title_full_unstemmed |
Widespread moulin formation during supraglacial lake drainages in Greenland |
title_sort |
widespread moulin formation during supraglacial lake drainages in greenland |
publisher |
American Geophysical Union |
publishDate |
2018 |
url |
https://www.zora.uzh.ch/id/eprint/162834/ https://www.zora.uzh.ch/id/eprint/162834/1/2018_Hoffman%26al2018.pdf https://doi.org/10.1002/2017gl075659 |
geographic |
Greenland |
geographic_facet |
Greenland |
genre |
glacier Greenland Ice Sheet |
genre_facet |
glacier Greenland Ice Sheet |
op_source |
Hoffman, Matthew J; Perego, Mauro; Andrews, Lauren C; Price, Stephen F; Neumann, Thomas A; Johnson, Jesse V; Catania, Ginny; Lüthi, Martin P (2018). Widespread moulin formation during supraglacial lake drainages in Greenland. Geophysical Research Letters, 45(2):778-788. |
op_relation |
https://www.zora.uzh.ch/id/eprint/162834/1/2018_Hoffman%26al2018.pdf doi:10.5167/uzh-162834 doi:10.1002/2017gl075659 urn:issn:0094-8276 |
op_rights |
info:eu-repo/semantics/openAccess Creative Commons: Attribution-NonCommercial-NoDerivatives 4.0 International (CC BY-NC-ND 4.0) http://creativecommons.org/licenses/by-nc-nd/4.0/ |
op_doi |
https://doi.org/10.1002/2017gl07565910.5167/uzh-162834 |
_version_ |
1812813732205559808 |