Coastal upwelling off North-West Africa

North of Cape Blanc, the north-easterly winds cause offshore flow of surface waters that are replaced by subsurface inflow of relatively cold and nutrient-rich waters, driving the vertical cell of coastal upwelling. This vertical circulation, together with surface heating and horizontal mixing, causes the coastal upwelling front (typically about 200 m deep) that separates cold onshore from warm offshore waters. A southward baroclinic coastal jet is associated to this front, which causes vertical shear and mixing that contribute to the intensity of the vertical cell. Very importantly, this jet feeds from upstream waters, resulting in an along-slope coherent flow, or the horizontal cell of coastal upwelling – this is the Canary Upwelling Current (CUC) that connects all surface coastal African waters north of Cape Blanc. Further south, because of the northward offshore flow and the seasonality of the winds, the connection remains only during winter and spring, very close to shelf break and in the top 100 m. North of Cape Blanc, a Poleward Undercurrent (PUC) flows in the relatively homogenous upwelled waters that found over the continental slope. South of Cape Blanc the PUC appears as a nearshore expression of the Mauritania Current. Both the southward CUC and the northward PUC constitute the true skeleton of the Canary Current Large Marine Ecosystem.

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Bibliographic Details
Main Authors: Pelegrí, Josep L., Benazzouz, Aïssa
Other Authors: Valdés, L.
Format: Report Section biblioteca
Language:English
Published: IOC-UNESCO 2015
Subjects:Coastal upwelling, Recirculation cells, Canary Upwelling Current, Poleward Undercurrent, CCLME, ASFA15::E::Ekman transport,
Online Access:http://hdl.handle.net/1834/9180
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spelling dig-aquadocs-1834-91802021-05-19T07:01:40Z Coastal upwelling off North-West Africa Upwelling off NW Africa Oceanographic and biological features in the Canary Current Large Marine Ecosystem.  Pelegrí, Josep L. Benazzouz, Aïssa Valdés, L. Déniz-González, I. Coastal upwelling Recirculation cells Canary Upwelling Current Poleward Undercurrent CCLME ASFA15::E::Ekman transport North of Cape Blanc, the north-easterly winds cause offshore flow of surface waters that are replaced by subsurface inflow of relatively cold and nutrient-rich waters, driving the vertical cell of coastal upwelling. This vertical circulation, together with surface heating and horizontal mixing, causes the coastal upwelling front (typically about 200 m deep) that separates cold onshore from warm offshore waters. A southward baroclinic coastal jet is associated to this front, which causes vertical shear and mixing that contribute to the intensity of the vertical cell. Very importantly, this jet feeds from upstream waters, resulting in an along-slope coherent flow, or the horizontal cell of coastal upwelling – this is the Canary Upwelling Current (CUC) that connects all surface coastal African waters north of Cape Blanc. Further south, because of the northward offshore flow and the seasonality of the winds, the connection remains only during winter and spring, very close to shelf break and in the top 100 m. North of Cape Blanc, a Poleward Undercurrent (PUC) flows in the relatively homogenous upwelled waters that found over the continental slope. South of Cape Blanc the PUC appears as a nearshore expression of the Mauritania Current. Both the southward CUC and the northward PUC constitute the true skeleton of the Canary Current Large Marine Ecosystem. Published 2016-07-27T14:52:59Z 2016-07-27T14:52:59Z 2015 Report Section Refereed http://hdl.handle.net/1834/9180 en Intergovernmental Oceanographic Commission, Technical Series: 115; http://www.unesco.org/new/en/ioc/ts115 pp. 93-103 Northwest Africa Canary Current IOC-UNESCO Paris, France
institution UNESCO
collection DSpace
country Francia
countrycode FR
component Bibliográfico
access En linea
databasecode dig-aquadocs
tag biblioteca
region Europa del Oeste
libraryname Repositorio AQUADOCS
language English
topic Coastal upwelling
Recirculation cells
Canary Upwelling Current
Poleward Undercurrent
CCLME
ASFA15::E::Ekman transport
Coastal upwelling
Recirculation cells
Canary Upwelling Current
Poleward Undercurrent
CCLME
ASFA15::E::Ekman transport
spellingShingle Coastal upwelling
Recirculation cells
Canary Upwelling Current
Poleward Undercurrent
CCLME
ASFA15::E::Ekman transport
Coastal upwelling
Recirculation cells
Canary Upwelling Current
Poleward Undercurrent
CCLME
ASFA15::E::Ekman transport
Pelegrí, Josep L.
Benazzouz, Aïssa
Coastal upwelling off North-West Africa
description North of Cape Blanc, the north-easterly winds cause offshore flow of surface waters that are replaced by subsurface inflow of relatively cold and nutrient-rich waters, driving the vertical cell of coastal upwelling. This vertical circulation, together with surface heating and horizontal mixing, causes the coastal upwelling front (typically about 200 m deep) that separates cold onshore from warm offshore waters. A southward baroclinic coastal jet is associated to this front, which causes vertical shear and mixing that contribute to the intensity of the vertical cell. Very importantly, this jet feeds from upstream waters, resulting in an along-slope coherent flow, or the horizontal cell of coastal upwelling – this is the Canary Upwelling Current (CUC) that connects all surface coastal African waters north of Cape Blanc. Further south, because of the northward offshore flow and the seasonality of the winds, the connection remains only during winter and spring, very close to shelf break and in the top 100 m. North of Cape Blanc, a Poleward Undercurrent (PUC) flows in the relatively homogenous upwelled waters that found over the continental slope. South of Cape Blanc the PUC appears as a nearshore expression of the Mauritania Current. Both the southward CUC and the northward PUC constitute the true skeleton of the Canary Current Large Marine Ecosystem.
author2 Valdés, L.
author_facet Valdés, L.
Pelegrí, Josep L.
Benazzouz, Aïssa
format Report Section
topic_facet Coastal upwelling
Recirculation cells
Canary Upwelling Current
Poleward Undercurrent
CCLME
ASFA15::E::Ekman transport
author Pelegrí, Josep L.
Benazzouz, Aïssa
author_sort Pelegrí, Josep L.
title Coastal upwelling off North-West Africa
title_short Coastal upwelling off North-West Africa
title_full Coastal upwelling off North-West Africa
title_fullStr Coastal upwelling off North-West Africa
title_full_unstemmed Coastal upwelling off North-West Africa
title_sort coastal upwelling off north-west africa
publisher IOC-UNESCO
publishDate 2015
url http://hdl.handle.net/1834/9180
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AT benazzouzaissa upwellingoffnwafrica
AT pelegrijosepl oceanographicandbiologicalfeaturesinthecanarycurrentlargemarineecosystem
AT benazzouzaissa oceanographicandbiologicalfeaturesinthecanarycurrentlargemarineecosystem
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