The Eastern Boundary of the Subtropical North Atlantic
International audience A quasi-meridional hydrographic section carried out between 60° and 20°N offshore from the European and African continental slopes is analyzed in terms of water masses and zonal transports in and out of the eastern boundary. Outstanding features of the meridional distribution...
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ftunivnantes:oai:HAL:hal-00276389v1 2023-05-15T17:30:50+02:00 The Eastern Boundary of the Subtropical North Atlantic Arhan, Michel Colin de Verdiere, Alain Mémery, Laurent Laboratoire de physique des océans (LPO) Institut de Recherche pour le Développement (IRD)-Institut Français de Recherche pour l'Exploitation de la Mer (IFREMER)-Université de Brest (UBO)-Centre National de la Recherche Scientifique (CNRS) Laboratoire d'océanographie dynamique et de climatologie (LODYC) Institut de Recherche pour le Développement (IRD)-Université Pierre et Marie Curie - Paris 6 (UPMC)-Centre National de la Recherche Scientifique (CNRS) 1994-06 https://hal.science/hal-00276389 https://doi.org/10.1175/1520-0485(1994)024<1295:TEBOTS>2.0.CO;2 en eng HAL CCSD American Meteorological Society info:eu-repo/semantics/altIdentifier/doi/10.1175/1520-0485(1994)024<1295:TEBOTS>2.0.CO;2 hal-00276389 https://hal.science/hal-00276389 doi:10.1175/1520-0485(1994)024<1295:TEBOTS>2.0.CO;2 ISSN: 0022-3670 EISSN: 1520-0485 Journal of Physical Oceanography https://hal.science/hal-00276389 Journal of Physical Oceanography, 1994, 24 (6), pp.1295-1316. ⟨10.1175/1520-0485(1994)0242.0.CO;2⟩ [SDU.STU.OC]Sciences of the Universe [physics]/Earth Sciences/Oceanography info:eu-repo/semantics/article Journal articles 1994 ftunivnantes https://doi.org/10.1175/1520-0485(1994)024<1295:TEBOTS>2.0.CO;2 https://doi.org/10.1175/1520-0485(1994)0242.0.CO;2 2023-02-08T06:01:48Z International audience A quasi-meridional hydrographic section carried out between 60° and 20°N offshore from the European and African continental slopes is analyzed in terms of water masses and zonal transports in and out of the eastern boundary. Outstanding features of the meridional distribution of water masses are focused on, such as the transition between North Atlantic and South Atlantic Central Waters at 20°–25°N, the properties and anticyclonic circulation of the Rockall Channel mode water, and the northern boundary of the large-scale Mediterranean Water plume at about 50°N. An eastward transport of about 11×10 6 m 3 s −1 is found to enter the eastern boundary layer at densities lower than 27.25 and feed southward alongshore currents. The relation of the incoming transport to the water mass distribution and its eventual splitting into several outflowing components are discussed. Apart from the downward entrainment of upper water known to occur in the Gulf of Cadiz, there is no sign of the so-called “eastern boundary ventilation” mechanism in the central water density range. Yet a significant transport is found to escape the winter mixed layer toward the interior of the subtropical gyre, suggesting the horizontal southward currents across the sloping bottom of the mixed layer to be the main cause of ventilation at the eastern boundary. Article in Journal/Newspaper North Atlantic Université de Nantes: HAL-UNIV-NANTES |
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Open Polar |
collection |
Université de Nantes: HAL-UNIV-NANTES |
op_collection_id |
ftunivnantes |
language |
English |
topic |
[SDU.STU.OC]Sciences of the Universe [physics]/Earth Sciences/Oceanography |
spellingShingle |
[SDU.STU.OC]Sciences of the Universe [physics]/Earth Sciences/Oceanography Arhan, Michel Colin de Verdiere, Alain Mémery, Laurent The Eastern Boundary of the Subtropical North Atlantic |
topic_facet |
[SDU.STU.OC]Sciences of the Universe [physics]/Earth Sciences/Oceanography |
description |
International audience A quasi-meridional hydrographic section carried out between 60° and 20°N offshore from the European and African continental slopes is analyzed in terms of water masses and zonal transports in and out of the eastern boundary. Outstanding features of the meridional distribution of water masses are focused on, such as the transition between North Atlantic and South Atlantic Central Waters at 20°–25°N, the properties and anticyclonic circulation of the Rockall Channel mode water, and the northern boundary of the large-scale Mediterranean Water plume at about 50°N. An eastward transport of about 11×10 6 m 3 s −1 is found to enter the eastern boundary layer at densities lower than 27.25 and feed southward alongshore currents. The relation of the incoming transport to the water mass distribution and its eventual splitting into several outflowing components are discussed. Apart from the downward entrainment of upper water known to occur in the Gulf of Cadiz, there is no sign of the so-called “eastern boundary ventilation” mechanism in the central water density range. Yet a significant transport is found to escape the winter mixed layer toward the interior of the subtropical gyre, suggesting the horizontal southward currents across the sloping bottom of the mixed layer to be the main cause of ventilation at the eastern boundary. |
author2 |
Laboratoire de physique des océans (LPO) Institut de Recherche pour le Développement (IRD)-Institut Français de Recherche pour l'Exploitation de la Mer (IFREMER)-Université de Brest (UBO)-Centre National de la Recherche Scientifique (CNRS) Laboratoire d'océanographie dynamique et de climatologie (LODYC) Institut de Recherche pour le Développement (IRD)-Université Pierre et Marie Curie - Paris 6 (UPMC)-Centre National de la Recherche Scientifique (CNRS) |
format |
Article in Journal/Newspaper |
author |
Arhan, Michel Colin de Verdiere, Alain Mémery, Laurent |
author_facet |
Arhan, Michel Colin de Verdiere, Alain Mémery, Laurent |
author_sort |
Arhan, Michel |
title |
The Eastern Boundary of the Subtropical North Atlantic |
title_short |
The Eastern Boundary of the Subtropical North Atlantic |
title_full |
The Eastern Boundary of the Subtropical North Atlantic |
title_fullStr |
The Eastern Boundary of the Subtropical North Atlantic |
title_full_unstemmed |
The Eastern Boundary of the Subtropical North Atlantic |
title_sort |
eastern boundary of the subtropical north atlantic |
publisher |
HAL CCSD |
publishDate |
1994 |
url |
https://hal.science/hal-00276389 https://doi.org/10.1175/1520-0485(1994)024<1295:TEBOTS>2.0.CO;2 |
genre |
North Atlantic |
genre_facet |
North Atlantic |
op_source |
ISSN: 0022-3670 EISSN: 1520-0485 Journal of Physical Oceanography https://hal.science/hal-00276389 Journal of Physical Oceanography, 1994, 24 (6), pp.1295-1316. ⟨10.1175/1520-0485(1994)0242.0.CO;2⟩ |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.1175/1520-0485(1994)024<1295:TEBOTS>2.0.CO;2 hal-00276389 https://hal.science/hal-00276389 doi:10.1175/1520-0485(1994)024<1295:TEBOTS>2.0.CO;2 |
op_doi |
https://doi.org/10.1175/1520-0485(1994)024<1295:TEBOTS>2.0.CO;2 https://doi.org/10.1175/1520-0485(1994)0242.0.CO;2 |
_version_ |
1766127927689216000 |