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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ftcolumbiauniv:oai:academiccommons.columbia.edu: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://doi.org/10.7916/D8H41RCG English eng IOP Publishing https://doi.org/10.7916/D8H41RCG Hydrology Meltwater Geomorphology Glacial lakes Ice sheets Geology Articles 2013 ftcolumbiauniv https://doi.org/10.7916/D8H41RCG 2019-04-04T08:14:19Z 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. Article in Journal/Newspaper Greenland Ice Sheet Columbia University: Academic Commons Greenland |
institution |
Open Polar |
collection |
Columbia University: Academic Commons |
op_collection_id |
ftcolumbiauniv |
language |
English |
topic |
Hydrology Meltwater Geomorphology Glacial lakes Ice sheets Geology |
spellingShingle |
Hydrology Meltwater Geomorphology Glacial lakes Ice sheets Geology 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 |
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 |
Article in Journal/Newspaper |
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 |
IOP Publishing |
publishDate |
2013 |
url |
https://doi.org/10.7916/D8H41RCG |
geographic |
Greenland |
geographic_facet |
Greenland |
genre |
Greenland Ice Sheet |
genre_facet |
Greenland Ice Sheet |
op_relation |
https://doi.org/10.7916/D8H41RCG |
op_doi |
https://doi.org/10.7916/D8H41RCG |
_version_ |
1766016602948501504 |