Hydraulic suppression of basal glacier melt in sill fjords
Using a conceptual model, we examine how hydraulically-controlled exchange flows in silled fjords affect the relationship between the basal glacier melt and the features of warm intermediate Atlantic Water (AW) outside the fjords. We show that an exchange flow can be forced to transit into the hydra...
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Copernicus Publications
2022
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ftnonlinearchiv:oai:noa.gwlb.de:cop_mods_00063821 2023-05-15T16:21:17+02:00 Hydraulic suppression of basal glacier melt in sill fjords Nilsson, Johan van Dongen, Eef Jakobsson, Martin O'Regan, Matt Stranne, Christian 2022-12 electronic https://doi.org/10.5194/egusphere-2022-1218 https://noa.gwlb.de/receive/cop_mods_00063821 https://egusphere.copernicus.org/preprints/egusphere-2022-1218/egusphere-2022-1218.pdf eng eng Copernicus Publications https://doi.org/10.5194/egusphere-2022-1218 https://noa.gwlb.de/receive/cop_mods_00063821 https://egusphere.copernicus.org/preprints/egusphere-2022-1218/egusphere-2022-1218.pdf https://creativecommons.org/licenses/by/4.0/ uneingeschränkt info:eu-repo/semantics/restrictedAccess CC-BY article Verlagsveröffentlichung article Text doc-type:article 2022 ftnonlinearchiv https://doi.org/10.5194/egusphere-2022-1218 2022-12-12T00:12:45Z Using a conceptual model, we examine how hydraulically-controlled exchange flows in silled fjords affect the relationship between the basal glacier melt and the features of warm intermediate Atlantic Water (AW) outside the fjords. We show that an exchange flow can be forced to transit into the hydraulic regime if the AW interface height decreases, the AW temperature increases, or the production of glacially modified water is boosted by subglacial discharge. In the hydraulic regime, the heat transport across the sill becomes a rate limiting factor for the basal melt, which is suppressed. An interplay between processes near the ice–ocean boundary and the hydraulically-controlled exchange flow determines the melt dynamics, and the sensitivity of the basal melt to changes of the AW temperature is reduced. The model results are discussed in relation to observations from Petermann, Ryder, and 79° N glaciers in North Greenland. Article in Journal/Newspaper glacier Greenland North Greenland Niedersächsisches Online-Archiv NOA Greenland Ryder ENVELOPE(-68.333,-68.333,-67.566,-67.566) |
institution |
Open Polar |
collection |
Niedersächsisches Online-Archiv NOA |
op_collection_id |
ftnonlinearchiv |
language |
English |
topic |
article Verlagsveröffentlichung |
spellingShingle |
article Verlagsveröffentlichung Nilsson, Johan van Dongen, Eef Jakobsson, Martin O'Regan, Matt Stranne, Christian Hydraulic suppression of basal glacier melt in sill fjords |
topic_facet |
article Verlagsveröffentlichung |
description |
Using a conceptual model, we examine how hydraulically-controlled exchange flows in silled fjords affect the relationship between the basal glacier melt and the features of warm intermediate Atlantic Water (AW) outside the fjords. We show that an exchange flow can be forced to transit into the hydraulic regime if the AW interface height decreases, the AW temperature increases, or the production of glacially modified water is boosted by subglacial discharge. In the hydraulic regime, the heat transport across the sill becomes a rate limiting factor for the basal melt, which is suppressed. An interplay between processes near the ice–ocean boundary and the hydraulically-controlled exchange flow determines the melt dynamics, and the sensitivity of the basal melt to changes of the AW temperature is reduced. The model results are discussed in relation to observations from Petermann, Ryder, and 79° N glaciers in North Greenland. |
format |
Article in Journal/Newspaper |
author |
Nilsson, Johan van Dongen, Eef Jakobsson, Martin O'Regan, Matt Stranne, Christian |
author_facet |
Nilsson, Johan van Dongen, Eef Jakobsson, Martin O'Regan, Matt Stranne, Christian |
author_sort |
Nilsson, Johan |
title |
Hydraulic suppression of basal glacier melt in sill fjords |
title_short |
Hydraulic suppression of basal glacier melt in sill fjords |
title_full |
Hydraulic suppression of basal glacier melt in sill fjords |
title_fullStr |
Hydraulic suppression of basal glacier melt in sill fjords |
title_full_unstemmed |
Hydraulic suppression of basal glacier melt in sill fjords |
title_sort |
hydraulic suppression of basal glacier melt in sill fjords |
publisher |
Copernicus Publications |
publishDate |
2022 |
url |
https://doi.org/10.5194/egusphere-2022-1218 https://noa.gwlb.de/receive/cop_mods_00063821 https://egusphere.copernicus.org/preprints/egusphere-2022-1218/egusphere-2022-1218.pdf |
long_lat |
ENVELOPE(-68.333,-68.333,-67.566,-67.566) |
geographic |
Greenland Ryder |
geographic_facet |
Greenland Ryder |
genre |
glacier Greenland North Greenland |
genre_facet |
glacier Greenland North Greenland |
op_relation |
https://doi.org/10.5194/egusphere-2022-1218 https://noa.gwlb.de/receive/cop_mods_00063821 https://egusphere.copernicus.org/preprints/egusphere-2022-1218/egusphere-2022-1218.pdf |
op_rights |
https://creativecommons.org/licenses/by/4.0/ uneingeschränkt info:eu-repo/semantics/restrictedAccess |
op_rightsnorm |
CC-BY |
op_doi |
https://doi.org/10.5194/egusphere-2022-1218 |
_version_ |
1766009301972811776 |