The continental slope current system between Cape Verde and the Canary Islands

The continental slope current system between Cape Verde and the Canary Islands

Special volume: Advances in Spanish physical oceanography. Scientia Marina 76(Suppl.1) 2012.-- 14 pages, 10 figures

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Main Authors: Peña-Izquierdo, Jesús, Pelegrí, Josep Lluís, Pastor, Maria V., Castellanos, Paola, Emelianov, Mikhail, Gasser, Marc, Salvador, Joaquín, Vázquez-Domínguez, Evaristo
Format: artículo biblioteca
Language:English
Published: Consejo Superior de Investigaciones Científicas (España) 2012-09
Subjects:Boundary circulation, Continental slope, Northwest Africa, Poleward undercurrent, Central water mass, Cape Verde frontal system, Circulación de frontera, Talud continental, África noroccidental, Corriente subsuperficial hacia el Polo, Masa de agua central, Sistema frontal de Cabo Verde,
Online Access:http://hdl.handle.net/10261/59508
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institution ICM ES
collection DSpace
country España
countrycode ES
component Bibliográfico
access En linea
databasecode dig-icm-es
tag biblioteca
region Europa del Sur
libraryname Biblioteca del ICM España
language English
topic Boundary circulation
Continental slope
Northwest Africa
Poleward undercurrent
Central water mass
Cape Verde frontal system
Circulación de frontera
Talud continental
África noroccidental
Corriente subsuperficial hacia el Polo
Masa de agua central
Sistema frontal de Cabo Verde
Boundary circulation
Continental slope
Northwest Africa
Poleward undercurrent
Central water mass
Cape Verde frontal system
Circulación de frontera
Talud continental
África noroccidental
Corriente subsuperficial hacia el Polo
Masa de agua central
Sistema frontal de Cabo Verde
spellingShingle Boundary circulation
Continental slope
Northwest Africa
Poleward undercurrent
Central water mass
Cape Verde frontal system
Circulación de frontera
Talud continental
África noroccidental
Corriente subsuperficial hacia el Polo
Masa de agua central
Sistema frontal de Cabo Verde
Boundary circulation
Continental slope
Northwest Africa
Poleward undercurrent
Central water mass
Cape Verde frontal system
Circulación de frontera
Talud continental
África noroccidental
Corriente subsuperficial hacia el Polo
Masa de agua central
Sistema frontal de Cabo Verde
Peña-Izquierdo, Jesús
Pelegrí, Josep Lluís
Pastor, Maria V.
Castellanos, Paola
Emelianov, Mikhail
Gasser, Marc
Salvador, Joaquín
Vázquez-Domínguez, Evaristo
The continental slope current system between Cape Verde and the Canary Islands
description Special volume: Advances in Spanish physical oceanography. Scientia Marina 76(Suppl.1) 2012.-- 14 pages, 10 figures
format artículo
topic_facet Boundary circulation
Continental slope
Northwest Africa
Poleward undercurrent
Central water mass
Cape Verde frontal system
Circulación de frontera
Talud continental
África noroccidental
Corriente subsuperficial hacia el Polo
Masa de agua central
Sistema frontal de Cabo Verde
author Peña-Izquierdo, Jesús
Pelegrí, Josep Lluís
Pastor, Maria V.
Castellanos, Paola
Emelianov, Mikhail
Gasser, Marc
Salvador, Joaquín
Vázquez-Domínguez, Evaristo
author_facet Peña-Izquierdo, Jesús
Pelegrí, Josep Lluís
Pastor, Maria V.
Castellanos, Paola
Emelianov, Mikhail
Gasser, Marc
Salvador, Joaquín
Vázquez-Domínguez, Evaristo
author_sort Peña-Izquierdo, Jesús
title The continental slope current system between Cape Verde and the Canary Islands
title_short The continental slope current system between Cape Verde and the Canary Islands
title_full The continental slope current system between Cape Verde and the Canary Islands
title_fullStr The continental slope current system between Cape Verde and the Canary Islands
title_full_unstemmed The continental slope current system between Cape Verde and the Canary Islands
title_sort continental slope current system between cape verde and the canary islands
publisher Consejo Superior de Investigaciones Científicas (España)
publishDate 2012-09
url http://hdl.handle.net/10261/59508
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spelling dig-icm-es-10261-595082020-11-27T18:53:42Z The continental slope current system between Cape Verde and the Canary Islands El sistema de corrientes de talud continental entre Cabo Verde y las Islas Canarias Peña-Izquierdo, Jesús Pelegrí, Josep Lluís Pastor, Maria V. Castellanos, Paola Emelianov, Mikhail Gasser, Marc Salvador, Joaquín Vázquez-Domínguez, Evaristo Boundary circulation Continental slope Northwest Africa Poleward undercurrent Central water mass Cape Verde frontal system Circulación de frontera Talud continental África noroccidental Corriente subsuperficial hacia el Polo Masa de agua central Sistema frontal de Cabo Verde Special volume: Advances in Spanish physical oceanography. Scientia Marina 76(Suppl.1) 2012.-- 14 pages, 10 figures [EN] We use hydrographic, velocity and drifter data from a cruise carried out in November 2008 to describe the continental slope current system in the upper thermocline (down to 600 m) between Cape Verde and the Canary Islands. The major feature in the region is the Cape Verde Frontal Zone (CVFZ), separating waters from tropical (southern) and subtropical (northern) origin. The CVFZ is found to intersect the slope north of Cape Blanc, between 22°N and 23°N, but we find that southern waters are predominant over the slope as far north as 24°N. South of Cape Blanc (21.25°N) the Poleward Undercurrent (PUC) is a prominent northward jet (50 km wide), reaching down to 300 m and indistinguishable from the surface Mauritanian Current. North of Cape Blanc the upwelling front is found far offshore, opening a near-slope northward path to the PUC. Nevertheless, the northward PUC transport decreases from 2.8 Sv at 18°N to 1.7 Sv at 24°N, with about 1 Sv recirculating ofshore just south of Cape Blanc, in agreement with the trajectory of subsurface drifters. South of the CVFZ there is an abrupt thermohaline transition at sq=26.85 kg m–3, which indicates the lower limit of the relatively pure (low salt and high oxygen content) South Atlantic Central Water (SACW) variety that coexists with the dominant locally-diluted (salinity increases through mixing with North Atlantic Central Water but oxygen diminishes because of enhanced remineralization) Cape Verde (SACWcv) variety. At 16°N about 70% of the PUC transport corresponds to the SACW variety but but this is transformed into 40% SACWcv at 24°N. However, between Cape Verde and Cape Blanc and in the 26.85<sq<27.1 layer, we measure up to 0.8 Sv of SACWcv being transported south. The results strongly endorse the idea that the slope current system plays a major role in tropical-subtropical water-mass exchange [ES] En este trabajo describimos el sistema de corrientes en la termoclina superior (hasta los 600 m) a lo largo del talud continental entre Cabo Verde y las Islas Canarias utilizando datos hidrográficos, de velocidad y de boyas de deriva obtenidos durante una campaña realizada en noviembre de 2008. La principal característica de la región es el Frente de Cabo Verde (Cape Verde Frontal Zone, CVFZ), que separa aguas de origen tropical (meridional) y subtropical (septentrional). A lo largo del talud el CVFZ suele situarse al norte de Cabo Blanco, entre 22 y 23°N, pero durante la campaña observamos sobre el talud y hasta 24°N una predominancia de aguas de origen meridional. Al sur de Cabo Blanco (21.25°N) la Corriente Subsuperficial hacia el Polo (Poleward Undercurrent, PUC) se observa como un flujo bien pronunciado (de 50 km de anchura), alcanzando los 300 m de profundidad e indistinguible de la superficial Corriente de Mauritania (Mauritanian Current, MC). Al norte de Cabo Blanco, el frente de afloramiento se encuentra alejado mar adentro, lo que facilita a la PUC seguir hacia el norte a lo largo del talud. Aún así, este transporte hacia el norte de la PUC se reduce de 2.8 Sv en 18°N hasta 1.7 Sv en 24°N, con alrededor de 1 Sv recirculando mar adentro justo al sur de Cabo Blanco, en coincidencia con las trayectorias de los derivadores subsuperficiales. Al sur del CVFZ se observa una marcada transición termohalina en sq=26.85. Esta transición indica el límite inferior de la relativamente pura (poco salada y rica en oxígeno) variedad de masa de agua Central Suratlántica (South Atlantic Central Water, SACW), la cual coexiste con la localmente dominante y diluida (más salada debido a la mezcla con NACW pero pobre en oxígeno por una intensificación de la remineralización) variedad de Cabo Verde (SACWcv). A 16°N alrededor del 70% del agua transportada por la PUC corresponde a SACW mientras que a 24°N se ha transformado en un 40% de SACWcv. En cambio, entre Cabo Verde y Cabo Blanco y en la capa 26.85<sq<27.1, medimos un transporte de SACWcv hacia el sur de hasta 0.8 Sv. Estos resultados apoyan firmemente la idea de que el sistema de corrientes de talud desempeña un papel esencial en el intercambio de masas de agua entre los regímenes tropical y subtropical This research has been funded by the Spanish Ministerio de Ciencia e Innovación through projects MOC2 (CTM2008-06438-C02-01), ARGO-CANARIAS (CTM2009-08462-E) and TIC-MOC (CTM2011-28867). JP-I has been supported through an FPI doctoral grant linked to MOC2. We are grateful to the technicians and crew of the R/V Sarmiento de Gamboa for their field support and to our cruise colleagues for many fruitful discussions Peer reviewed 2012-11-06T08:18:25Z 2012-11-06T08:18:25Z 2012-09 artículo http://purl.org/coar/resource_type/c_6501 Scientia Marina 76(Suppl.1): 65-78 (2012) 0214-8358 http://hdl.handle.net/10261/59508 10.3989/scimar.03607.18C 1886-8134 en https://doi.org/10.3989/scimar.03607.18C open Consejo Superior de Investigaciones Científicas (España)

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