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...
Published in: | The Cryosphere |
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Format: | Article in Journal/Newspaper |
Language: | English |
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Copernicus Publications
2023
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Online Access: | https://doi.org/10.5194/tc-17-2455-2023 https://doaj.org/article/8e33a0c481524df182684a01880ec916 |
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ftdoajarticles:oai:doaj.org/article:8e33a0c481524df182684a01880ec916 2023-07-16T03:58:34+02:00 Hydraulic suppression of basal glacier melt in sill fjords J. Nilsson E. van Dongen M. Jakobsson M. O'Regan C. Stranne 2023-06-01T00:00:00Z https://doi.org/10.5194/tc-17-2455-2023 https://doaj.org/article/8e33a0c481524df182684a01880ec916 EN eng Copernicus Publications https://tc.copernicus.org/articles/17/2455/2023/tc-17-2455-2023.pdf https://doaj.org/toc/1994-0416 https://doaj.org/toc/1994-0424 doi:10.5194/tc-17-2455-2023 1994-0416 1994-0424 https://doaj.org/article/8e33a0c481524df182684a01880ec916 The Cryosphere, Vol 17, Pp 2455-2476 (2023) Environmental sciences GE1-350 Geology QE1-996.5 article 2023 ftdoajarticles https://doi.org/10.5194/tc-17-2455-2023 2023-06-25T00:34:39Z 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 in the AW temperature is reduced. The model results are discussed in relation to observations from the Petermann, Ryder, and 79 ∘ N glaciers in northern Greenland. Article in Journal/Newspaper glacier Greenland The Cryosphere Directory of Open Access Journals: DOAJ Articles Greenland Ryder ENVELOPE(-68.333,-68.333,-67.566,-67.566) The Cryosphere 17 6 2455 2476 |
institution |
Open Polar |
collection |
Directory of Open Access Journals: DOAJ Articles |
op_collection_id |
ftdoajarticles |
language |
English |
topic |
Environmental sciences GE1-350 Geology QE1-996.5 |
spellingShingle |
Environmental sciences GE1-350 Geology QE1-996.5 J. Nilsson E. van Dongen M. Jakobsson M. O'Regan C. Stranne Hydraulic suppression of basal glacier melt in sill fjords |
topic_facet |
Environmental sciences GE1-350 Geology QE1-996.5 |
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 in the AW temperature is reduced. The model results are discussed in relation to observations from the Petermann, Ryder, and 79 ∘ N glaciers in northern Greenland. |
format |
Article in Journal/Newspaper |
author |
J. Nilsson E. van Dongen M. Jakobsson M. O'Regan C. Stranne |
author_facet |
J. Nilsson E. van Dongen M. Jakobsson M. O'Regan C. Stranne |
author_sort |
J. Nilsson |
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 |
2023 |
url |
https://doi.org/10.5194/tc-17-2455-2023 https://doaj.org/article/8e33a0c481524df182684a01880ec916 |
long_lat |
ENVELOPE(-68.333,-68.333,-67.566,-67.566) |
geographic |
Greenland Ryder |
geographic_facet |
Greenland Ryder |
genre |
glacier Greenland The Cryosphere |
genre_facet |
glacier Greenland The Cryosphere |
op_source |
The Cryosphere, Vol 17, Pp 2455-2476 (2023) |
op_relation |
https://tc.copernicus.org/articles/17/2455/2023/tc-17-2455-2023.pdf https://doaj.org/toc/1994-0416 https://doaj.org/toc/1994-0424 doi:10.5194/tc-17-2455-2023 1994-0416 1994-0424 https://doaj.org/article/8e33a0c481524df182684a01880ec916 |
op_doi |
https://doi.org/10.5194/tc-17-2455-2023 |
container_title |
The Cryosphere |
container_volume |
17 |
container_issue |
6 |
container_start_page |
2455 |
op_container_end_page |
2476 |
_version_ |
1771545729893924864 |