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. In spite of the substantial impact of moulins on ice dynamics, the conditions under which they form are poorly understood. We assimilate a...
Published in: | Geophysical Research Letters |
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Online Access: | http://www.osti.gov/servlets/purl/1417820 https://www.osti.gov/biblio/1417820 https://doi.org/10.1002/2017GL075659 |
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ftosti:oai:osti.gov:1417820 2023-07-30T04:03:37+02:00 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. 2023-02-23 application/pdf http://www.osti.gov/servlets/purl/1417820 https://www.osti.gov/biblio/1417820 https://doi.org/10.1002/2017GL075659 unknown http://www.osti.gov/servlets/purl/1417820 https://www.osti.gov/biblio/1417820 https://doi.org/10.1002/2017GL075659 doi:10.1002/2017GL075659 58 GEOSCIENCES 2023 ftosti https://doi.org/10.1002/2017GL075659 2023-07-11T09:23:45Z 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. In spite of 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. Conversely, 63% of moulins 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. Other/Unknown Material glacier Greenland Ice Sheet SciTec Connect (Office of Scientific and Technical Information - OSTI, U.S. Department of Energy) Greenland Geophysical Research Letters 45 2 778 788 |
institution |
Open Polar |
collection |
SciTec Connect (Office of Scientific and Technical Information - OSTI, U.S. Department of Energy) |
op_collection_id |
ftosti |
language |
unknown |
topic |
58 GEOSCIENCES |
spellingShingle |
58 GEOSCIENCES 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 |
58 GEOSCIENCES |
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. In spite of 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. Conversely, 63% of moulins 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. |
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 |
publishDate |
2023 |
url |
http://www.osti.gov/servlets/purl/1417820 https://www.osti.gov/biblio/1417820 https://doi.org/10.1002/2017GL075659 |
geographic |
Greenland |
geographic_facet |
Greenland |
genre |
glacier Greenland Ice Sheet |
genre_facet |
glacier Greenland Ice Sheet |
op_relation |
http://www.osti.gov/servlets/purl/1417820 https://www.osti.gov/biblio/1417820 https://doi.org/10.1002/2017GL075659 doi:10.1002/2017GL075659 |
op_doi |
https://doi.org/10.1002/2017GL075659 |
container_title |
Geophysical Research Letters |
container_volume |
45 |
container_issue |
2 |
container_start_page |
778 |
op_container_end_page |
788 |
_version_ |
1772814652241084416 |