A Persistent Deep Anticyclonic Vortex in the Rockall Trough Sustained by Anticyclonic Vortices Shed From the Slope Current and Wintertime Convection
International audience The presence of a persistent surface anticyclone centered at approximately 55°N, 12°W in the Rockall Trough, northeast North Atlantic, has been previously noted in satellite altimetry data. Here, we show that this surface anticyclone is the imprint of a deep, persistent, non-s...
Published in: | Journal of Geophysical Research: Oceans |
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Format: | Article in Journal/Newspaper |
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Online Access: | https://hal.univ-brest.fr/hal-03154502 https://hal.univ-brest.fr/hal-03154502/document https://hal.univ-brest.fr/hal-03154502/file/2019JC015905.pdf https://doi.org/10.1029/2019JC015905 |
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ftinsu:oai:HAL:hal-03154502v1 2024-04-14T08:15:43+00:00 A Persistent Deep Anticyclonic Vortex in the Rockall Trough Sustained by Anticyclonic Vortices Shed From the Slope Current and Wintertime Convection Smilenova, Angelina Gula, Jonathan Le Corre, Mathieu Houpert, Loïc Reecht, Yves National University of Ireland Galway (NUI Galway) Laboratoire d'Océanographie Physique et Spatiale (LOPS) Institut de Recherche pour le Développement (IRD)-Institut Français de Recherche pour l'Exploitation de la Mer (IFREMER)-Institut national des sciences de l'Univers (INSU - CNRS)-Université de Brest (UBO)-Centre National de la Recherche Scientifique (CNRS) National Oceanography Centre (NOC) Institute of Marine Research Bergen (IMR) University of Bergen (UiB) Interdisciplinary Graduate School for the Blue planet ANR-17-EURE-0015,ISBlue,Interdisciplinary Graduate School for the Blue planet(2017) 2020 https://hal.univ-brest.fr/hal-03154502 https://hal.univ-brest.fr/hal-03154502/document https://hal.univ-brest.fr/hal-03154502/file/2019JC015905.pdf https://doi.org/10.1029/2019JC015905 en eng HAL CCSD Wiley-Blackwell info:eu-repo/semantics/altIdentifier/doi/10.1029/2019JC015905 hal-03154502 https://hal.univ-brest.fr/hal-03154502 https://hal.univ-brest.fr/hal-03154502/document https://hal.univ-brest.fr/hal-03154502/file/2019JC015905.pdf doi:10.1029/2019JC015905 info:eu-repo/semantics/OpenAccess ISSN: 2169-9275 EISSN: 2169-9291 Journal of Geophysical Research. Oceans https://hal.univ-brest.fr/hal-03154502 Journal of Geophysical Research. Oceans, 2020, 125 (10), pp.e2019JC015905. ⟨10.1029/2019JC015905⟩ eddy merger instability mesoscale eddy potential vorticity transformations Rockall Trough topographic effects water masses mixing [SDU.OCEAN]Sciences of the Universe [physics]/Ocean Atmosphere info:eu-repo/semantics/article Journal articles 2020 ftinsu https://doi.org/10.1029/2019JC015905 2024-03-21T17:17:23Z International audience The presence of a persistent surface anticyclone centered at approximately 55°N, 12°W in the Rockall Trough, northeast North Atlantic, has been previously noted in satellite altimetry data. Here, we show that this surface anticyclone is the imprint of a deep, persistent, non-stationary anticyclonic vortex. Using wintertime 2007 and 2011 ship-board data, we describe the anticyclone's vertical structure for the first time and find that the anticyclone core is partly made of warm and salty Mediterranean Overflow Water. The anticyclone has a radius of ~40 km, it stretches down to 2,000 m, with a velocity maximum around 500 m. To analyze the anticyclone's generating mechanism, we use a mesoscale-resolving (~2 km) simulation, which produces a realistic pattern of the Rockall Trough anticyclone. The simulation indicates that the anticyclone is locally formed and sustained by two types of processes: wintertime convection and merger with anticyclonic vortices shed from the slope current flowing poleward along the eastern Rockall Trough slope. Intense negative vorticity filaments are generated along the Rockall Trough south-eastern slope, and they encapsulate Mediterranean Overflow Water as they detach and grow into anticyclonic vortices. These Mediterranean Overflow Water-rich vortices are advected into the trough, consequently merging with the Rockall Trough anticyclone and sustaining it. We suggest that the Rockall Trough anticyclone impacts regional intermediate water masses modifications, heat and salt budgets locally, and further afield into the neighboring subpolar northeast North Atlantic. Article in Journal/Newspaper North Atlantic Institut national des sciences de l'Univers: HAL-INSU Rockall Trough ENVELOPE(-15.036,-15.036,53.825,53.825) Journal of Geophysical Research: Oceans 125 10 |
institution |
Open Polar |
collection |
Institut national des sciences de l'Univers: HAL-INSU |
op_collection_id |
ftinsu |
language |
English |
topic |
eddy merger instability mesoscale eddy potential vorticity transformations Rockall Trough topographic effects water masses mixing [SDU.OCEAN]Sciences of the Universe [physics]/Ocean Atmosphere |
spellingShingle |
eddy merger instability mesoscale eddy potential vorticity transformations Rockall Trough topographic effects water masses mixing [SDU.OCEAN]Sciences of the Universe [physics]/Ocean Atmosphere Smilenova, Angelina Gula, Jonathan Le Corre, Mathieu Houpert, Loïc Reecht, Yves A Persistent Deep Anticyclonic Vortex in the Rockall Trough Sustained by Anticyclonic Vortices Shed From the Slope Current and Wintertime Convection |
topic_facet |
eddy merger instability mesoscale eddy potential vorticity transformations Rockall Trough topographic effects water masses mixing [SDU.OCEAN]Sciences of the Universe [physics]/Ocean Atmosphere |
description |
International audience The presence of a persistent surface anticyclone centered at approximately 55°N, 12°W in the Rockall Trough, northeast North Atlantic, has been previously noted in satellite altimetry data. Here, we show that this surface anticyclone is the imprint of a deep, persistent, non-stationary anticyclonic vortex. Using wintertime 2007 and 2011 ship-board data, we describe the anticyclone's vertical structure for the first time and find that the anticyclone core is partly made of warm and salty Mediterranean Overflow Water. The anticyclone has a radius of ~40 km, it stretches down to 2,000 m, with a velocity maximum around 500 m. To analyze the anticyclone's generating mechanism, we use a mesoscale-resolving (~2 km) simulation, which produces a realistic pattern of the Rockall Trough anticyclone. The simulation indicates that the anticyclone is locally formed and sustained by two types of processes: wintertime convection and merger with anticyclonic vortices shed from the slope current flowing poleward along the eastern Rockall Trough slope. Intense negative vorticity filaments are generated along the Rockall Trough south-eastern slope, and they encapsulate Mediterranean Overflow Water as they detach and grow into anticyclonic vortices. These Mediterranean Overflow Water-rich vortices are advected into the trough, consequently merging with the Rockall Trough anticyclone and sustaining it. We suggest that the Rockall Trough anticyclone impacts regional intermediate water masses modifications, heat and salt budgets locally, and further afield into the neighboring subpolar northeast North Atlantic. |
author2 |
National University of Ireland Galway (NUI Galway) Laboratoire d'Océanographie Physique et Spatiale (LOPS) Institut de Recherche pour le Développement (IRD)-Institut Français de Recherche pour l'Exploitation de la Mer (IFREMER)-Institut national des sciences de l'Univers (INSU - CNRS)-Université de Brest (UBO)-Centre National de la Recherche Scientifique (CNRS) National Oceanography Centre (NOC) Institute of Marine Research Bergen (IMR) University of Bergen (UiB) Interdisciplinary Graduate School for the Blue planet ANR-17-EURE-0015,ISBlue,Interdisciplinary Graduate School for the Blue planet(2017) |
format |
Article in Journal/Newspaper |
author |
Smilenova, Angelina Gula, Jonathan Le Corre, Mathieu Houpert, Loïc Reecht, Yves |
author_facet |
Smilenova, Angelina Gula, Jonathan Le Corre, Mathieu Houpert, Loïc Reecht, Yves |
author_sort |
Smilenova, Angelina |
title |
A Persistent Deep Anticyclonic Vortex in the Rockall Trough Sustained by Anticyclonic Vortices Shed From the Slope Current and Wintertime Convection |
title_short |
A Persistent Deep Anticyclonic Vortex in the Rockall Trough Sustained by Anticyclonic Vortices Shed From the Slope Current and Wintertime Convection |
title_full |
A Persistent Deep Anticyclonic Vortex in the Rockall Trough Sustained by Anticyclonic Vortices Shed From the Slope Current and Wintertime Convection |
title_fullStr |
A Persistent Deep Anticyclonic Vortex in the Rockall Trough Sustained by Anticyclonic Vortices Shed From the Slope Current and Wintertime Convection |
title_full_unstemmed |
A Persistent Deep Anticyclonic Vortex in the Rockall Trough Sustained by Anticyclonic Vortices Shed From the Slope Current and Wintertime Convection |
title_sort |
persistent deep anticyclonic vortex in the rockall trough sustained by anticyclonic vortices shed from the slope current and wintertime convection |
publisher |
HAL CCSD |
publishDate |
2020 |
url |
https://hal.univ-brest.fr/hal-03154502 https://hal.univ-brest.fr/hal-03154502/document https://hal.univ-brest.fr/hal-03154502/file/2019JC015905.pdf https://doi.org/10.1029/2019JC015905 |
long_lat |
ENVELOPE(-15.036,-15.036,53.825,53.825) |
geographic |
Rockall Trough |
geographic_facet |
Rockall Trough |
genre |
North Atlantic |
genre_facet |
North Atlantic |
op_source |
ISSN: 2169-9275 EISSN: 2169-9291 Journal of Geophysical Research. Oceans https://hal.univ-brest.fr/hal-03154502 Journal of Geophysical Research. Oceans, 2020, 125 (10), pp.e2019JC015905. ⟨10.1029/2019JC015905⟩ |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.1029/2019JC015905 hal-03154502 https://hal.univ-brest.fr/hal-03154502 https://hal.univ-brest.fr/hal-03154502/document https://hal.univ-brest.fr/hal-03154502/file/2019JC015905.pdf doi:10.1029/2019JC015905 |
op_rights |
info:eu-repo/semantics/OpenAccess |
op_doi |
https://doi.org/10.1029/2019JC015905 |
container_title |
Journal of Geophysical Research: Oceans |
container_volume |
125 |
container_issue |
10 |
_version_ |
1796314131095093248 |