Norwegian Atlantic Slope Current along the Lofoten Escarpment
International audience Abstract. Observations from moored instruments are analyzed to describe the Norwegian Atlantic Slope Current at the Lofoten Escarpment. 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...
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ftunivtoulon:oai:HAL:hal-02928480v1 2023-12-31T10:09:05+01:00 Norwegian Atlantic Slope Current along the Lofoten Escarpment Fer, Ilker Bosse, Anthony Dugstad, Johannes Bjerknes Centre for Climate Research (BCCR) Department of Biological Sciences Bergen (BIO / UiB) University of Bergen (UiB)-University of Bergen (UiB) Geophysical Institute Bergen (GFI / BiU) University of Bergen (UiB) Institut méditerranéen d'océanologie (MIO) Institut de Recherche pour le Développement (IRD)-Aix Marseille Université (AMU)-Institut national des sciences de l'Univers (INSU - CNRS)-Université de Toulon (UTLN)-Centre National de la Recherche Scientifique (CNRS) Aix Marseille Université (AMU) Research Council of Norway, through the projectWater mass transformationprocesses and vortex dynamics in the Lofoten Basin in the Norwegian Sea (PROVOLO), project 250784 2020 https://hal.science/hal-02928480 https://hal.science/hal-02928480/document https://hal.science/hal-02928480/file/os-2020-15.pdf https://doi.org/10.5194/os-2020-15 en eng HAL CCSD European Geosciences Union info:eu-repo/semantics/altIdentifier/doi/10.5194/os-2020-15 hal-02928480 https://hal.science/hal-02928480 https://hal.science/hal-02928480/document https://hal.science/hal-02928480/file/os-2020-15.pdf doi:10.5194/os-2020-15 http://creativecommons.org/licenses/by/ info:eu-repo/semantics/OpenAccess ISSN: 1812-0784 EISSN: 1812-0792 Ocean Science https://hal.science/hal-02928480 Ocean Science, 2020, 16 (3), pp.685-701. ⟨10.5194/os-2020-15⟩ [SDU]Sciences of the Universe [physics] [SDU.OCEAN]Sciences of the Universe [physics]/Ocean Atmosphere info:eu-repo/semantics/article Journal articles 2020 ftunivtoulon https://doi.org/10.5194/os-2020-15 2023-12-05T23:40:06Z International audience Abstract. Observations from moored instruments are analyzed to describe the Norwegian Atlantic Slope Current at the Lofoten Escarpment. 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 m and 1500 m isobaths. The along-slope current, vertically averaged between 200 and 600 m depth has an annual cycle amplitude of 0.1 m s−1 with 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, 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 is estimated at 2.8 ± 1.8 Sv (1 Sv = 106 m3 s−1), with summer and winter averages of 2.3 and 4.0 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 Université de Toulon: HAL |
institution |
Open Polar |
collection |
Université de Toulon: HAL |
op_collection_id |
ftunivtoulon |
language |
English |
topic |
[SDU]Sciences of the Universe [physics] [SDU.OCEAN]Sciences of the Universe [physics]/Ocean Atmosphere |
spellingShingle |
[SDU]Sciences of the Universe [physics] [SDU.OCEAN]Sciences of the Universe [physics]/Ocean Atmosphere Fer, Ilker Bosse, Anthony Dugstad, Johannes Norwegian Atlantic Slope Current along the Lofoten Escarpment |
topic_facet |
[SDU]Sciences of the Universe [physics] [SDU.OCEAN]Sciences of the Universe [physics]/Ocean Atmosphere |
description |
International audience Abstract. Observations from moored instruments are analyzed to describe the Norwegian Atlantic Slope Current at the Lofoten Escarpment. 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 m and 1500 m isobaths. The along-slope current, vertically averaged between 200 and 600 m depth has an annual cycle amplitude of 0.1 m s−1 with 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, 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 is estimated at 2.8 ± 1.8 Sv (1 Sv = 106 m3 s−1), with summer and winter averages of 2.3 and 4.0 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. |
author2 |
Bjerknes Centre for Climate Research (BCCR) Department of Biological Sciences Bergen (BIO / UiB) University of Bergen (UiB)-University of Bergen (UiB) Geophysical Institute Bergen (GFI / BiU) University of Bergen (UiB) Institut méditerranéen d'océanologie (MIO) Institut de Recherche pour le Développement (IRD)-Aix Marseille Université (AMU)-Institut national des sciences de l'Univers (INSU - CNRS)-Université de Toulon (UTLN)-Centre National de la Recherche Scientifique (CNRS) Aix Marseille Université (AMU) Research Council of Norway, through the projectWater mass transformationprocesses and vortex dynamics in the Lofoten Basin in the Norwegian Sea (PROVOLO), project 250784 |
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 |
HAL CCSD |
publishDate |
2020 |
url |
https://hal.science/hal-02928480 https://hal.science/hal-02928480/document https://hal.science/hal-02928480/file/os-2020-15.pdf https://doi.org/10.5194/os-2020-15 |
genre |
Lofoten |
genre_facet |
Lofoten |
op_source |
ISSN: 1812-0784 EISSN: 1812-0792 Ocean Science https://hal.science/hal-02928480 Ocean Science, 2020, 16 (3), pp.685-701. ⟨10.5194/os-2020-15⟩ |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.5194/os-2020-15 hal-02928480 https://hal.science/hal-02928480 https://hal.science/hal-02928480/document https://hal.science/hal-02928480/file/os-2020-15.pdf doi:10.5194/os-2020-15 |
op_rights |
http://creativecommons.org/licenses/by/ info:eu-repo/semantics/OpenAccess |
op_doi |
https://doi.org/10.5194/os-2020-15 |
_version_ |
1786842086852526080 |