Rapid basal melting of the Greenland Ice Sheet from surface meltwater drainage ...
Subglacial hydrologic systems regulate ice sheet flow, causing acceleration or deceleration depending on hydraulic efficiency and the rate at which surface meltwater is delivered to the bed. Because these systems are rarely observed, ice sheet basal drainage represents a poorly integrated and uncertai...
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ftdatacite:10.17863/cam.82846 2024-02-27T08:40:44+00:00 Rapid basal melting of the Greenland Ice Sheet from surface meltwater drainage ... Young, Tun Jan Christoffersen, Poul Bougamont, Marion Tulaczyk, Slawek Mankoff, Kenneth Nicholls, Keith Stewart, Craig 2022 https://dx.doi.org/10.17863/cam.82846 https://www.repository.cam.ac.uk/handle/1810/335417 en eng National Academy of Sciences open.access Creative Commons Attribution Non Commercial No Derivatives 4.0 International https://creativecommons.org/licenses/by-nc-nd/4.0/legalcode cc-by-nc-nd-4.0 http://purl.org/coar/access_right/c_abf2 Greenland climate change glaciology ice sheets radio echo sounding article-journal ScholarlyArticle JournalArticle Article 2022 ftdatacite https://doi.org/10.17863/cam.82846 2024-02-01T15:02:53Z Subglacial hydrologic systems regulate ice sheet flow, causing acceleration or deceleration depending on hydraulic efficiency and the rate at which surface meltwater is delivered to the bed. Because these systems are rarely observed, ice sheet basal drainage represents a poorly integrated and uncertain component of models used to predict sea-level changes. Here, we report radar-derived basal melt rates and unexpectedly warm subglacial conditions beneath a large Greenlandic outlet glacier. The basal melt rates averaged 14 mm d−1 over 4 months, peaking at 57 mm d−1 when basal wa-ter temperature reached +0.88 C in a nearby borehole. We attribute both observations to the conversion of potential energy of surface water as heat in the basal drainage system, which peaked during a period of rainfall and intense surface melting. Our findings reveal limitations in the theory of channel formation and we show that viscous dissipation far surpasses other basal heat sources, even in a distributed, high-pressure system. ... Article in Journal/Newspaper glacier Greenland greenlandic Ice Sheet DataCite Metadata Store (German National Library of Science and Technology) Greenland |
institution |
Open Polar |
collection |
DataCite Metadata Store (German National Library of Science and Technology) |
op_collection_id |
ftdatacite |
language |
English |
topic |
Greenland climate change glaciology ice sheets radio echo sounding |
spellingShingle |
Greenland climate change glaciology ice sheets radio echo sounding Young, Tun Jan Christoffersen, Poul Bougamont, Marion Tulaczyk, Slawek Mankoff, Kenneth Nicholls, Keith Stewart, Craig Rapid basal melting of the Greenland Ice Sheet from surface meltwater drainage ... |
topic_facet |
Greenland climate change glaciology ice sheets radio echo sounding |
description |
Subglacial hydrologic systems regulate ice sheet flow, causing acceleration or deceleration depending on hydraulic efficiency and the rate at which surface meltwater is delivered to the bed. Because these systems are rarely observed, ice sheet basal drainage represents a poorly integrated and uncertain component of models used to predict sea-level changes. Here, we report radar-derived basal melt rates and unexpectedly warm subglacial conditions beneath a large Greenlandic outlet glacier. The basal melt rates averaged 14 mm d−1 over 4 months, peaking at 57 mm d−1 when basal wa-ter temperature reached +0.88 C in a nearby borehole. We attribute both observations to the conversion of potential energy of surface water as heat in the basal drainage system, which peaked during a period of rainfall and intense surface melting. Our findings reveal limitations in the theory of channel formation and we show that viscous dissipation far surpasses other basal heat sources, even in a distributed, high-pressure system. ... |
format |
Article in Journal/Newspaper |
author |
Young, Tun Jan Christoffersen, Poul Bougamont, Marion Tulaczyk, Slawek Mankoff, Kenneth Nicholls, Keith Stewart, Craig |
author_facet |
Young, Tun Jan Christoffersen, Poul Bougamont, Marion Tulaczyk, Slawek Mankoff, Kenneth Nicholls, Keith Stewart, Craig |
author_sort |
Young, Tun Jan |
title |
Rapid basal melting of the Greenland Ice Sheet from surface meltwater drainage ... |
title_short |
Rapid basal melting of the Greenland Ice Sheet from surface meltwater drainage ... |
title_full |
Rapid basal melting of the Greenland Ice Sheet from surface meltwater drainage ... |
title_fullStr |
Rapid basal melting of the Greenland Ice Sheet from surface meltwater drainage ... |
title_full_unstemmed |
Rapid basal melting of the Greenland Ice Sheet from surface meltwater drainage ... |
title_sort |
rapid basal melting of the greenland ice sheet from surface meltwater drainage ... |
publisher |
National Academy of Sciences |
publishDate |
2022 |
url |
https://dx.doi.org/10.17863/cam.82846 https://www.repository.cam.ac.uk/handle/1810/335417 |
geographic |
Greenland |
geographic_facet |
Greenland |
genre |
glacier Greenland greenlandic Ice Sheet |
genre_facet |
glacier Greenland greenlandic Ice Sheet |
op_rights |
open.access Creative Commons Attribution Non Commercial No Derivatives 4.0 International https://creativecommons.org/licenses/by-nc-nd/4.0/legalcode cc-by-nc-nd-4.0 http://purl.org/coar/access_right/c_abf2 |
op_doi |
https://doi.org/10.17863/cam.82846 |
_version_ |
1792047876680974336 |