Ice dynamic response to two modes of surface lake drainage on the Greenland ice sheet
Supraglacial lake drainage on the Greenland ice sheet opens surface-to-bed connections, reduces basal friction, and temporarily increases ice flow velocities by up to an order of magnitude. Existing field-based observations of lake drainages and their impact on ice dynamics are limited, and focus on...
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Columbia University
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ftdatacite:10.7916/d8h41rcg 2023-05-15T16:27:26+02:00 Ice dynamic response to two modes of surface lake drainage on the Greenland ice sheet Tedesco, Marco Willis, Ian C. Hoffman, Matthew J. Banwell, Alison F. Alexander, Patrick Arnold, Neil S. 2013 https://dx.doi.org/10.7916/d8h41rcg https://academiccommons.columbia.edu/doi/10.7916/D8H41RCG unknown Columbia University https://dx.doi.org/10.1088/1748-9326/8/3/034007 Hydrology Meltwater Geomorphology Glacial lakes Ice sheets Geology FOS Earth and related environmental sciences Text Articles article-journal ScholarlyArticle 2013 ftdatacite https://doi.org/10.7916/d8h41rcg https://doi.org/10.1088/1748-9326/8/3/034007 2021-11-05T12:55:41Z Supraglacial lake drainage on the Greenland ice sheet opens surface-to-bed connections, reduces basal friction, and temporarily increases ice flow velocities by up to an order of magnitude. Existing field-based observations of lake drainages and their impact on ice dynamics are limited, and focus on one specific draining mechanism. Here, we report and analyse global positioning system measurements of ice velocity and elevation made at five locations surrounding two lakes that drained by different mechanisms and produced different dynamic responses. For the lake that drained slowly (>24 h) by overtopping its basin, delivering water via a channel to a pre-existing moulin, speedup and uplift were less than half those associated with a lake that drained rapidly (~2 h) through hydrofracturing and the creation of new moulins in the lake bottom. Our results suggest that the mode and associated rate of lake drainage govern the impact on ice dynamics. Text Greenland Ice Sheet DataCite Metadata Store (German National Library of Science and Technology) Greenland |
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DataCite Metadata Store (German National Library of Science and Technology) |
op_collection_id |
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language |
unknown |
topic |
Hydrology Meltwater Geomorphology Glacial lakes Ice sheets Geology FOS Earth and related environmental sciences |
spellingShingle |
Hydrology Meltwater Geomorphology Glacial lakes Ice sheets Geology FOS Earth and related environmental sciences Tedesco, Marco Willis, Ian C. Hoffman, Matthew J. Banwell, Alison F. Alexander, Patrick Arnold, Neil S. Ice dynamic response to two modes of surface lake drainage on the Greenland ice sheet |
topic_facet |
Hydrology Meltwater Geomorphology Glacial lakes Ice sheets Geology FOS Earth and related environmental sciences |
description |
Supraglacial lake drainage on the Greenland ice sheet opens surface-to-bed connections, reduces basal friction, and temporarily increases ice flow velocities by up to an order of magnitude. Existing field-based observations of lake drainages and their impact on ice dynamics are limited, and focus on one specific draining mechanism. Here, we report and analyse global positioning system measurements of ice velocity and elevation made at five locations surrounding two lakes that drained by different mechanisms and produced different dynamic responses. For the lake that drained slowly (>24 h) by overtopping its basin, delivering water via a channel to a pre-existing moulin, speedup and uplift were less than half those associated with a lake that drained rapidly (~2 h) through hydrofracturing and the creation of new moulins in the lake bottom. Our results suggest that the mode and associated rate of lake drainage govern the impact on ice dynamics. |
format |
Text |
author |
Tedesco, Marco Willis, Ian C. Hoffman, Matthew J. Banwell, Alison F. Alexander, Patrick Arnold, Neil S. |
author_facet |
Tedesco, Marco Willis, Ian C. Hoffman, Matthew J. Banwell, Alison F. Alexander, Patrick Arnold, Neil S. |
author_sort |
Tedesco, Marco |
title |
Ice dynamic response to two modes of surface lake drainage on the Greenland ice sheet |
title_short |
Ice dynamic response to two modes of surface lake drainage on the Greenland ice sheet |
title_full |
Ice dynamic response to two modes of surface lake drainage on the Greenland ice sheet |
title_fullStr |
Ice dynamic response to two modes of surface lake drainage on the Greenland ice sheet |
title_full_unstemmed |
Ice dynamic response to two modes of surface lake drainage on the Greenland ice sheet |
title_sort |
ice dynamic response to two modes of surface lake drainage on the greenland ice sheet |
publisher |
Columbia University |
publishDate |
2013 |
url |
https://dx.doi.org/10.7916/d8h41rcg https://academiccommons.columbia.edu/doi/10.7916/D8H41RCG |
geographic |
Greenland |
geographic_facet |
Greenland |
genre |
Greenland Ice Sheet |
genre_facet |
Greenland Ice Sheet |
op_relation |
https://dx.doi.org/10.1088/1748-9326/8/3/034007 |
op_doi |
https://doi.org/10.7916/d8h41rcg https://doi.org/10.1088/1748-9326/8/3/034007 |
_version_ |
1766016613302140928 |