Properties and pathways of Mediterranean water eddies in the Atlantic
International audience Data from ship vertical casts (NODC data-set), ARGO profiling floats (Coriolis data-set) and RAFOS-type neutral density floats (WOCE data-set) are used to study characteristics of meddies in the Northeast Atlantic. In total 241 Mediterranean water eddies (meddies) and 236 part...
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ftunivbrest:oai:HAL:hal-01495010v1 2023-12-17T10:45:59+01:00 Properties and pathways of Mediterranean water eddies in the Atlantic Bashmachnikov, I. Neves, F. Calheiros, T. Carton, X. Centro de Oceanografia Université de Lisbonne Departamento de Engenharia Geografica (DEGGE) Universidade de Lisboa = University of Lisbon (ULISBOA) Laboratory of Oceanography Saint Petersburg State University (SPBU) 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) 2015-09 https://hal.univ-brest.fr/hal-01495010 https://doi.org/10.1016/j.pocean.2015.06.001 en eng HAL CCSD Elsevier info:eu-repo/semantics/altIdentifier/doi/10.1016/j.pocean.2015.06.001 hal-01495010 https://hal.univ-brest.fr/hal-01495010 doi:10.1016/j.pocean.2015.06.001 ISSN: 0079-6611 Progress in Oceanography https://hal.univ-brest.fr/hal-01495010 Progress in Oceanography, 2015, 137 (Part A), pp.149-172. ⟨10.1016/j.pocean.2015.06.001⟩ [SDU.STU.OC]Sciences of the Universe [physics]/Earth Sciences/Oceanography info:eu-repo/semantics/article Journal articles 2015 ftunivbrest https://doi.org/10.1016/j.pocean.2015.06.001 2023-11-21T23:43:13Z International audience Data from ship vertical casts (NODC data-set), ARGO profiling floats (Coriolis data-set) and RAFOS-type neutral density floats (WOCE data-set) are used to study characteristics of meddies in the Northeast Atlantic. In total 241 Mediterranean water eddies (meddies) and 236 parts of float trajectories within meddies are selected for detailed analysis. The results suggest that the meddy generation rate at the southern and southwestern Iberian Peninsula (Portimao Canyon, cap St. Vincent, Estremadura Promontory, Gorringe Bank) is 3 times that at the northwestern Iberian Peninsula (Porto-Aveiro Canyons, Cape Finisterre and Galicia Bank).Meddies generated south of Estremadura Promontory (the southern meddies), as compared to those generated north of it (the northern meddies), have smaller radii, smaller vertical extension, higher aspect ratio, higher Rossby number and higher stability (stronger potential vorticity anomaly). These latter properties result from the southern meddies higher relative vorticity and stronger buoyancy frequency anomaly.Away from the generation regions, meddy drift concentrates along four main paths: three quasi-zonal paths (Northern, Central, Southern) and a path following the African coast (Coastal). The quasi-zonal paths are aligned to the isolines of the ambient potential vorticity field. Several cross-path exchanges, identified in this work, are aligned to topographic rises. Northward translation of the northern meddies within the North Atlantic Current to the subpolar gyre is detected.Within the first 600 km from the coast, meddy merger is proved to be a common event. This explains the observed difference in radii between the newly generated meddies and those away from the Iberian margin.The decay of the southern meddies proceeds mainly via the loss of their skirts and does not affect meddy cores until the latest stages. The decay of the northern meddies goes in parallel with the decay of their cores. In average meddy decay is achieved within 1–2 years, although ... Article in Journal/Newspaper north atlantic current North Atlantic Northeast Atlantic Université de Bretagne Occidentale: HAL Progress in Oceanography 137 149 172 |
institution |
Open Polar |
collection |
Université de Bretagne Occidentale: HAL |
op_collection_id |
ftunivbrest |
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 Bashmachnikov, I. Neves, F. Calheiros, T. Carton, X. Properties and pathways of Mediterranean water eddies in the Atlantic |
topic_facet |
[SDU.STU.OC]Sciences of the Universe [physics]/Earth Sciences/Oceanography |
description |
International audience Data from ship vertical casts (NODC data-set), ARGO profiling floats (Coriolis data-set) and RAFOS-type neutral density floats (WOCE data-set) are used to study characteristics of meddies in the Northeast Atlantic. In total 241 Mediterranean water eddies (meddies) and 236 parts of float trajectories within meddies are selected for detailed analysis. The results suggest that the meddy generation rate at the southern and southwestern Iberian Peninsula (Portimao Canyon, cap St. Vincent, Estremadura Promontory, Gorringe Bank) is 3 times that at the northwestern Iberian Peninsula (Porto-Aveiro Canyons, Cape Finisterre and Galicia Bank).Meddies generated south of Estremadura Promontory (the southern meddies), as compared to those generated north of it (the northern meddies), have smaller radii, smaller vertical extension, higher aspect ratio, higher Rossby number and higher stability (stronger potential vorticity anomaly). These latter properties result from the southern meddies higher relative vorticity and stronger buoyancy frequency anomaly.Away from the generation regions, meddy drift concentrates along four main paths: three quasi-zonal paths (Northern, Central, Southern) and a path following the African coast (Coastal). The quasi-zonal paths are aligned to the isolines of the ambient potential vorticity field. Several cross-path exchanges, identified in this work, are aligned to topographic rises. Northward translation of the northern meddies within the North Atlantic Current to the subpolar gyre is detected.Within the first 600 km from the coast, meddy merger is proved to be a common event. This explains the observed difference in radii between the newly generated meddies and those away from the Iberian margin.The decay of the southern meddies proceeds mainly via the loss of their skirts and does not affect meddy cores until the latest stages. The decay of the northern meddies goes in parallel with the decay of their cores. In average meddy decay is achieved within 1–2 years, although ... |
author2 |
Centro de Oceanografia Université de Lisbonne Departamento de Engenharia Geografica (DEGGE) Universidade de Lisboa = University of Lisbon (ULISBOA) Laboratory of Oceanography Saint Petersburg State University (SPBU) 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) |
format |
Article in Journal/Newspaper |
author |
Bashmachnikov, I. Neves, F. Calheiros, T. Carton, X. |
author_facet |
Bashmachnikov, I. Neves, F. Calheiros, T. Carton, X. |
author_sort |
Bashmachnikov, I. |
title |
Properties and pathways of Mediterranean water eddies in the Atlantic |
title_short |
Properties and pathways of Mediterranean water eddies in the Atlantic |
title_full |
Properties and pathways of Mediterranean water eddies in the Atlantic |
title_fullStr |
Properties and pathways of Mediterranean water eddies in the Atlantic |
title_full_unstemmed |
Properties and pathways of Mediterranean water eddies in the Atlantic |
title_sort |
properties and pathways of mediterranean water eddies in the atlantic |
publisher |
HAL CCSD |
publishDate |
2015 |
url |
https://hal.univ-brest.fr/hal-01495010 https://doi.org/10.1016/j.pocean.2015.06.001 |
genre |
north atlantic current North Atlantic Northeast Atlantic |
genre_facet |
north atlantic current North Atlantic Northeast Atlantic |
op_source |
ISSN: 0079-6611 Progress in Oceanography https://hal.univ-brest.fr/hal-01495010 Progress in Oceanography, 2015, 137 (Part A), pp.149-172. ⟨10.1016/j.pocean.2015.06.001⟩ |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.1016/j.pocean.2015.06.001 hal-01495010 https://hal.univ-brest.fr/hal-01495010 doi:10.1016/j.pocean.2015.06.001 |
op_doi |
https://doi.org/10.1016/j.pocean.2015.06.001 |
container_title |
Progress in Oceanography |
container_volume |
137 |
container_start_page |
149 |
op_container_end_page |
172 |
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1785569312181846016 |