Meridional changes in water mass distributions off NW Africa during November 2007/2008

An optimum multiparameter analysis was applied to a data set for the eastern boundary of the North Atlantic subtropical gyre, gathered during November of two consecutive years and spanning from 16 to 36º N. This data set covers over 20º of latitude with good meridional and zonal resolution over the...

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Main Authors:	Pastor, MV, Peña-Izquierdo, J, Pelegrí, JL, Marrero-Díaz, Á
Format:	info:eu-repo/semantics/article
Language:	eng
Published:	Iniversidad Autónoma de Baja California 2011
Subjects:	optimum multiparameter analysis eastern subtropical North Atlantic central waters intermediate waters deep waters análisis multiparamétrico óptimo Atlántico Subtropical Noreste aguas centrales aguas intermedias aguas profundas
Online Access:	https://www.cienciasmarinas.com.mx/index.php/cmarinas/article/view/1831
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id	repositorioinstitucional-20.500.12930-7445
record_format	dspace
institution	Repositorio Institucional
collection	DSpace
language	eng
topic	optimum multiparameter analysis eastern subtropical North Atlantic central waters intermediate waters deep waters análisis multiparamétrico óptimo Atlántico Subtropical Noreste aguas centrales aguas intermedias aguas profundas
spellingShingle	optimum multiparameter analysis eastern subtropical North Atlantic central waters intermediate waters deep waters análisis multiparamétrico óptimo Atlántico Subtropical Noreste aguas centrales aguas intermedias aguas profundas Pastor, MV Peña-Izquierdo, J Pelegrí, JL Marrero-Díaz, Á Meridional changes in water mass distributions off NW Africa during November 2007/2008
description	An optimum multiparameter analysis was applied to a data set for the eastern boundary of the North Atlantic subtropical gyre, gathered during November of two consecutive years and spanning from 16 to 36º N. This data set covers over 20º of latitude with good meridional and zonal resolution over the whole coastal transition zone. The contribution from six water types in the depth range between 100 and 2000 m is solved. In the 100 to 700 m depth range the central waters of southern and northern origin meet abruptly at the Cape Verde Frontal Zone. This front traditionally has been reported to stretch from Cape Blanc, at about 21.5º N, to the Cape Verde Islands, but in our case it penetrates as far as 24º N over the continental slope. South of 21º N latitude we actually find a less saline and more oxygenated variety of South Atlantic Central Water, which we ascribe to less diluted equatorial waters. In the 700 to 1500 m depth range the dominant water type is a diluted form of Antarctic Intermediate Water (AAIW), whose influence smoothly disappears north of the Canary Islands as it is replaced by Mediterranean Water (MW); at latitudes where both water masses coexist, we observe MW offshore while AAIW is found near-shore. North Atlantic Deep Water is the dominating water type below about 1300/1700 m depth south/north of the Canary Islands; this abrupt change in depth suggests the existence of different paths for the deep waters reaching both sides of the archipelago.
format	info:eu-repo/semantics/article
author	Pastor, MV Peña-Izquierdo, J Pelegrí, JL Marrero-Díaz, Á
author_facet	Pastor, MV Peña-Izquierdo, J Pelegrí, JL Marrero-Díaz, Á
author_sort	Pastor, MV
title	Meridional changes in water mass distributions off NW Africa during November 2007/2008
title_short	Meridional changes in water mass distributions off NW Africa during November 2007/2008
title_full	Meridional changes in water mass distributions off NW Africa during November 2007/2008
title_fullStr	Meridional changes in water mass distributions off NW Africa during November 2007/2008
title_full_unstemmed	Meridional changes in water mass distributions off NW Africa during November 2007/2008
title_sort	meridional changes in water mass distributions off nw africa during november 2007/2008
publisher	Iniversidad Autónoma de Baja California
publishDate	2011
url	https://www.cienciasmarinas.com.mx/index.php/cmarinas/article/view/1831
_version_	1792609120439762944
spelling	repositorioinstitucional-20.500.12930-74452023-05-09T14:30:31Z Meridional changes in water mass distributions off NW Africa during November 2007/2008 Variación latitudinal en la distribución de masas de agua al NO de África durante noviembre de 2007/2008 Pastor, MV Peña-Izquierdo, J Pelegrí, JL Marrero-Díaz, Á optimum multiparameter analysis eastern subtropical North Atlantic central waters intermediate waters deep waters análisis multiparamétrico óptimo Atlántico Subtropical Noreste aguas centrales aguas intermedias aguas profundas An optimum multiparameter analysis was applied to a data set for the eastern boundary of the North Atlantic subtropical gyre, gathered during November of two consecutive years and spanning from 16 to 36º N. This data set covers over 20º of latitude with good meridional and zonal resolution over the whole coastal transition zone. The contribution from six water types in the depth range between 100 and 2000 m is solved. In the 100 to 700 m depth range the central waters of southern and northern origin meet abruptly at the Cape Verde Frontal Zone. This front traditionally has been reported to stretch from Cape Blanc, at about 21.5º N, to the Cape Verde Islands, but in our case it penetrates as far as 24º N over the continental slope. South of 21º N latitude we actually find a less saline and more oxygenated variety of South Atlantic Central Water, which we ascribe to less diluted equatorial waters. In the 700 to 1500 m depth range the dominant water type is a diluted form of Antarctic Intermediate Water (AAIW), whose influence smoothly disappears north of the Canary Islands as it is replaced by Mediterranean Water (MW); at latitudes where both water masses coexist, we observe MW offshore while AAIW is found near-shore. North Atlantic Deep Water is the dominating water type below about 1300/1700 m depth south/north of the Canary Islands; this abrupt change in depth suggests the existence of different paths for the deep waters reaching both sides of the archipelago.   Se aplicó un análisis multiparamétrico óptimo a un set de datos en el margen oriental del giro subtropical del Atlántico Norte, recogido en noviembre de dos años consecutivos y que se extiende entre las latitudes 16 y 36º N. El set de datos cubre unos 20º de latitud y tiene una buena resolución meridional y zonal en toda la región de transición costera. La contribución de seis tipos de agua es resuelta en el intervalo de densidad entre 100 y 2000 m. Entre los 100 y 700 m de profundidad, las aguas centrales del Atlántico Norte y Sur se encuentran abruptamente en el frente de Cabo Verde. Tradicionalmente se ha descrito que la posición de este frente se alarga desde cabo Blanco, a unos 21.5º N, hasta las islas de Cabo Verde, pero nuestras observaciones muestran que penetra hasta 24º N cerca del talud continental. Al sur de 21º N se encuentra una variedad de Agua Central Sudatlántica menos salina y más oxigenada, que adscribimos a aguas ecuatoriales menos diluidas. Entre los 700 y los 1500 m de profundidad el tipo de agua dominante es un tipo diluido de Agua Antártica Intermedia (AAIW), cuya influencia desaparece suavemente al norte de las islas Canarias al ser reemplazada por Agua Mediterránea (MW); en las latitudes donde ambas masas de agua coexisten se aprecia que el MW se sitúa aguas afuera mientras que el AAIW se coloca cercana al talud. El Agua Profunda Noratlántica domina por debajo de los 1300/1700 m al sur/norte de las islas Canarias; este cambio abrupto en profundidad sugiere la existencia de caminos diferentes para las aguas profundas que llegan a cada lado del archipiélago. 2011-10-24 2021-06-03T03:55:19Z 2021-06-03T03:55:19Z info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Peer-reviewed Article Artículo Arbitrado https://www.cienciasmarinas.com.mx/index.php/cmarinas/article/view/1831 10.7773/cm.v38i1B.1831 https://hdl.handle.net/20.500.12930/7445 eng https://www.cienciasmarinas.com.mx/index.php/cmarinas/article/view/1831/1667 application/pdf Iniversidad Autónoma de Baja California Ciencias Marinas; Vol. 38 No. 1B (2012); 223-244 Ciencias Marinas; Vol. 38 Núm. 1B (2012); 223-244 2395-9053 0185-3880

Meridional changes in water mass distributions off NW Africa during November 2007/2008

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