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 |
---|---|
Main Authors: | , , , , |
Format: | Article in Journal/Newspaper |
Language: | English |
Published: |
Copernicus Publications
2023
|
Subjects: | |
Online Access: | https://doi.org/10.5194/tc-17-2455-2023 https://noa.gwlb.de/receive/cop_mods_00067248 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00065712/tc-17-2455-2023.pdf https://tc.copernicus.org/articles/17/2455/2023/tc-17-2455-2023.pdf |
id |
ftnonlinearchiv:oai:noa.gwlb.de:cop_mods_00067248 |
---|---|
record_format |
openpolar |
spelling |
ftnonlinearchiv:oai:noa.gwlb.de:cop_mods_00067248 2023-07-16T03:58:34+02:00 Hydraulic suppression of basal glacier melt in sill fjords Nilsson, Johan van Dongen, Eef Jakobsson, Martin O'Regan, Matt Stranne, Christian 2023-06 electronic https://doi.org/10.5194/tc-17-2455-2023 https://noa.gwlb.de/receive/cop_mods_00067248 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00065712/tc-17-2455-2023.pdf https://tc.copernicus.org/articles/17/2455/2023/tc-17-2455-2023.pdf eng eng Copernicus Publications The Cryosphere -- ˜Theœ Cryosphere -- http://www.bibliothek.uni-regensburg.de/ezeit/?2393169 -- http://www.the-cryosphere.net/ -- 1994-0424 https://doi.org/10.5194/tc-17-2455-2023 https://noa.gwlb.de/receive/cop_mods_00067248 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00065712/tc-17-2455-2023.pdf https://tc.copernicus.org/articles/17/2455/2023/tc-17-2455-2023.pdf https://creativecommons.org/licenses/by/4.0/ uneingeschränkt info:eu-repo/semantics/openAccess article Verlagsveröffentlichung article Text doc-type:article 2023 ftnonlinearchiv https://doi.org/10.5194/tc-17-2455-2023 2023-06-25T23:18:50Z 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 Niedersächsisches Online-Archiv NOA Greenland Ryder ENVELOPE(-68.333,-68.333,-67.566,-67.566) The Cryosphere 17 6 2455 2476 |
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 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 |
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 |
2023 |
url |
https://doi.org/10.5194/tc-17-2455-2023 https://noa.gwlb.de/receive/cop_mods_00067248 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00065712/tc-17-2455-2023.pdf https://tc.copernicus.org/articles/17/2455/2023/tc-17-2455-2023.pdf |
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_relation |
The Cryosphere -- ˜Theœ Cryosphere -- http://www.bibliothek.uni-regensburg.de/ezeit/?2393169 -- http://www.the-cryosphere.net/ -- 1994-0424 https://doi.org/10.5194/tc-17-2455-2023 https://noa.gwlb.de/receive/cop_mods_00067248 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00065712/tc-17-2455-2023.pdf https://tc.copernicus.org/articles/17/2455/2023/tc-17-2455-2023.pdf |
op_rights |
https://creativecommons.org/licenses/by/4.0/ uneingeschränkt info:eu-repo/semantics/openAccess |
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_ |
1771545729729298432 |