Norwegian Atlantic Slope Current along the Lofoten Escarpment
Observations from moored instruments are analyzed to describe the Norwegian Atlantic Slope Current at the Lofoten Escarpment (13∘ E, 69∘ N). The data set covers a 14-month period from June 2016 to September 2017 and resolves the core of the current from 200 to 650 m depth between the 650 and 1500 m...
Published in: | Ocean Science |
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Language: | English |
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Copernicus Publications
2020
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ftnonlinearchiv:oai:noa.gwlb.de:cop_mods_00051690 2023-05-15T17:08:15+02:00 Norwegian Atlantic Slope Current along the Lofoten Escarpment Fer, Ilker Bosse, Anthony Dugstad, Johannes 2020-06 electronic https://doi.org/10.5194/os-16-685-2020 https://noa.gwlb.de/receive/cop_mods_00051690 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00051346/os-16-685-2020.pdf https://os.copernicus.org/articles/16/685/2020/os-16-685-2020.pdf eng eng Copernicus Publications Ocean Science -- http://www.bibliothek.uni-regensburg.de/ezeit/?2183769 -- http://www.copernicus.org/EGU/os/os.html -- 1812-0792 https://doi.org/10.5194/os-16-685-2020 https://noa.gwlb.de/receive/cop_mods_00051690 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00051346/os-16-685-2020.pdf https://os.copernicus.org/articles/16/685/2020/os-16-685-2020.pdf https://creativecommons.org/licenses/by/4.0/ uneingeschränkt info:eu-repo/semantics/openAccess CC-BY article Verlagsveröffentlichung article Text doc-type:article 2020 ftnonlinearchiv https://doi.org/10.5194/os-16-685-2020 2022-02-08T22:36:18Z Observations from moored instruments are analyzed to describe the Norwegian Atlantic Slope Current at the Lofoten Escarpment (13∘ E, 69∘ N). The data set covers a 14-month period from June 2016 to September 2017 and resolves the core of the current from 200 to 650 m depth between the 650 and 1500 m isobaths. The along-isobath current, vertically averaged between 200 and 600 m depth, has an annual cycle amplitude of 0.1 m s−1, with the strongest currents in winter, and a temporal average of 0.15 m s−1. Higher-frequency variability is characterized by fluctuations that reach 0.8 m s−1, lasting for 1 to 2 weeks, and extend as deep as 600 m. In contrast to observations in Svinøy (2∘ E, 63∘ N), the slope current is not barotropic and varies strongly with depth (a shear of 0.05 to 0.1 m s−1 per 100 m in all seasons). Within the limitations of the data, the average volume transport of Atlantic Water is estimated at 2.0±0.8 Sv (1 Sv =106 m3 s−1), with summer and winter averages of 1.6 and 2.9 Sv, respectively. The largest transport is associated with the high temperature classes (>7 ∘C) in all seasons, with the largest values of both transport and temperature in winter. Calculations of the barotropic and baroclinic conversion rates using the moorings are supplemented by results from a high-resolution numerical model. While the conversion from mean to eddy kinetic energy (e.g., barotropic instability) is likely negligible over the Lofoten Escarpment, the baroclinic conversion from mean potential energy into eddy kinetic energy (e.g., baroclinic instability) can be substantial, with volume-averaged values of (1–2 )×10-4 W m−3. Article in Journal/Newspaper Lofoten Niedersächsisches Online-Archiv NOA Lofoten Svinøy ENVELOPE(10.992,10.992,64.866,64.866) Ocean Science 16 3 685 701 |
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Open Polar |
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Niedersächsisches Online-Archiv NOA |
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ftnonlinearchiv |
language |
English |
topic |
article Verlagsveröffentlichung |
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article Verlagsveröffentlichung Fer, Ilker Bosse, Anthony Dugstad, Johannes Norwegian Atlantic Slope Current along the Lofoten Escarpment |
topic_facet |
article Verlagsveröffentlichung |
description |
Observations from moored instruments are analyzed to describe the Norwegian Atlantic Slope Current at the Lofoten Escarpment (13∘ E, 69∘ N). The data set covers a 14-month period from June 2016 to September 2017 and resolves the core of the current from 200 to 650 m depth between the 650 and 1500 m isobaths. The along-isobath current, vertically averaged between 200 and 600 m depth, has an annual cycle amplitude of 0.1 m s−1, with the strongest currents in winter, and a temporal average of 0.15 m s−1. Higher-frequency variability is characterized by fluctuations that reach 0.8 m s−1, lasting for 1 to 2 weeks, and extend as deep as 600 m. In contrast to observations in Svinøy (2∘ E, 63∘ N), the slope current is not barotropic and varies strongly with depth (a shear of 0.05 to 0.1 m s−1 per 100 m in all seasons). Within the limitations of the data, the average volume transport of Atlantic Water is estimated at 2.0±0.8 Sv (1 Sv =106 m3 s−1), with summer and winter averages of 1.6 and 2.9 Sv, respectively. The largest transport is associated with the high temperature classes (>7 ∘C) in all seasons, with the largest values of both transport and temperature in winter. Calculations of the barotropic and baroclinic conversion rates using the moorings are supplemented by results from a high-resolution numerical model. While the conversion from mean to eddy kinetic energy (e.g., barotropic instability) is likely negligible over the Lofoten Escarpment, the baroclinic conversion from mean potential energy into eddy kinetic energy (e.g., baroclinic instability) can be substantial, with volume-averaged values of (1–2 )×10-4 W m−3. |
format |
Article in Journal/Newspaper |
author |
Fer, Ilker Bosse, Anthony Dugstad, Johannes |
author_facet |
Fer, Ilker Bosse, Anthony Dugstad, Johannes |
author_sort |
Fer, Ilker |
title |
Norwegian Atlantic Slope Current along the Lofoten Escarpment |
title_short |
Norwegian Atlantic Slope Current along the Lofoten Escarpment |
title_full |
Norwegian Atlantic Slope Current along the Lofoten Escarpment |
title_fullStr |
Norwegian Atlantic Slope Current along the Lofoten Escarpment |
title_full_unstemmed |
Norwegian Atlantic Slope Current along the Lofoten Escarpment |
title_sort |
norwegian atlantic slope current along the lofoten escarpment |
publisher |
Copernicus Publications |
publishDate |
2020 |
url |
https://doi.org/10.5194/os-16-685-2020 https://noa.gwlb.de/receive/cop_mods_00051690 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00051346/os-16-685-2020.pdf https://os.copernicus.org/articles/16/685/2020/os-16-685-2020.pdf |
long_lat |
ENVELOPE(10.992,10.992,64.866,64.866) |
geographic |
Lofoten Svinøy |
geographic_facet |
Lofoten Svinøy |
genre |
Lofoten |
genre_facet |
Lofoten |
op_relation |
Ocean Science -- http://www.bibliothek.uni-regensburg.de/ezeit/?2183769 -- http://www.copernicus.org/EGU/os/os.html -- 1812-0792 https://doi.org/10.5194/os-16-685-2020 https://noa.gwlb.de/receive/cop_mods_00051690 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00051346/os-16-685-2020.pdf https://os.copernicus.org/articles/16/685/2020/os-16-685-2020.pdf |
op_rights |
https://creativecommons.org/licenses/by/4.0/ uneingeschränkt info:eu-repo/semantics/openAccess |
op_rightsnorm |
CC-BY |
op_doi |
https://doi.org/10.5194/os-16-685-2020 |
container_title |
Ocean Science |
container_volume |
16 |
container_issue |
3 |
container_start_page |
685 |
op_container_end_page |
701 |
_version_ |
1766063953663754240 |