Thermohaline measurements in the continental shelf zone of the NW Iberian Peninsula, 1994–2006

From 1994 to 2006, we conducted a monthly series of CTD sampling along a coastal–shelf transect, in the Ria de Vigo and the adjacent shelf (NW Iberian Upwelling System; 42 to 44°N and 8 to 10°W). Our aim was to determine the spatial variability of the hydrographic processes over different timescales...

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Detalles Bibliográficos
Autores: Gago, Jesús, Cabanas-López, José Manuel, Casas-Rodríguez, Gerardo, Miranda, Ana
Tipo de recurso: artículo
Fecha de publicación:2011
País:España
Institución:Consejo Superior de Investigaciones Científicas (CSIC)
Repositorio:DIGITAL.CSIC. Repositorio Institucional del CSIC
OAI Identifier:oai:digital.csic.es:10261/322007
Acceso en línea:http://hdl.handle.net/10261/322007
Access Level:acceso abierto
Palabra clave:Medio Marino
Centro Oceanográfico de Vigo
Salinity
Temperature
Temporal series
Upwelling
NW Iberian Peninsula
Ria de Vigo
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spelling Thermohaline measurements in the continental shelf zone of the NW Iberian Peninsula, 1994–2006Gago, JesúsCabanas-López, José ManuelCasas-Rodríguez, GerardoMiranda, AnaMedio MarinoCentro Oceanográfico de VigoSalinityTemperatureTemporal seriesUpwellingNW Iberian PeninsulaRia de VigoFrom 1994 to 2006, we conducted a monthly series of CTD sampling along a coastal–shelf transect, in the Ria de Vigo and the adjacent shelf (NW Iberian Upwelling System; 42 to 44°N and 8 to 10°W). Our aim was to determine the spatial variability of the hydrographic processes over different timescales (seasonal and inter-annual) at 3 stations (ria, near-shore and shelf edge), and their relationship with other related oceanographic and climatic indices: upwelling index (UI) and North Atlantic Oscillation index (NAO). At a seasonal scale, a change in water temperature from inversion (December to February) to stratification (April to September) was found at all stations. The maximum vertical gradient in temperature is reached in July-August, coinciding with the middle of the upwelling season. The seasonal salinity cycle is influenced by continental runoff and, in winter time, by salty subtropical water carried alongshore by the Iberian Poleward Current. At an inter-annual scale, during spring-summer (upwelling season), in the upper layer of the ria station, a warming (0.06°C yr–1) is observed. This is in accordance with the multidecadal decreasing trend in upwelling intensity (~5 m3 s–1 km of coast–1 yr–1) that would have favoured a warming of surface coastal waters. In contrast, a surface temperature decrease (0.11°C yr–1) was observed at the shelf-edge station in the autumn-winter period (downscaling season). We hypothesise that the observed reduction in temperature is due to the combined effect of the increase in upwelling events during the downwelling season and the decline of NAO since 1995. No significant temporal trends on an inter-annual scale were found in salinity values in surface or bottom layers of the stations.peer reviewed202320232011info:eu-repo/semantics/articlehttp://purl.org/coar/resource_type/c_6501http://hdl.handle.net/10261/322007reponame:DIGITAL.CSIC. Repositorio Institucional del CSICinstname:Consejo Superior de Investigaciones Científicas (CSIC)InglésCentro Oceanográfico de Vigohttps://doi.org/10.3354/cr00943info:eu-repo/semantics/openAccessoai:digital.csic.es:10261/3220072026-05-22T06:33:51Z
dc.title.none.fl_str_mv Thermohaline measurements in the continental shelf zone of the NW Iberian Peninsula, 1994–2006
title Thermohaline measurements in the continental shelf zone of the NW Iberian Peninsula, 1994–2006
spellingShingle Thermohaline measurements in the continental shelf zone of the NW Iberian Peninsula, 1994–2006
Gago, Jesús
Medio Marino
Centro Oceanográfico de Vigo
Salinity
Temperature
Temporal series
Upwelling
NW Iberian Peninsula
Ria de Vigo
title_short Thermohaline measurements in the continental shelf zone of the NW Iberian Peninsula, 1994–2006
title_full Thermohaline measurements in the continental shelf zone of the NW Iberian Peninsula, 1994–2006
title_fullStr Thermohaline measurements in the continental shelf zone of the NW Iberian Peninsula, 1994–2006
title_full_unstemmed Thermohaline measurements in the continental shelf zone of the NW Iberian Peninsula, 1994–2006
title_sort Thermohaline measurements in the continental shelf zone of the NW Iberian Peninsula, 1994–2006
dc.creator.none.fl_str_mv Gago, Jesús
Cabanas-López, José Manuel
Casas-Rodríguez, Gerardo
Miranda, Ana
author Gago, Jesús
author_facet Gago, Jesús
Cabanas-López, José Manuel
Casas-Rodríguez, Gerardo
Miranda, Ana
author_role author
author2 Cabanas-López, José Manuel
Casas-Rodríguez, Gerardo
Miranda, Ana
author2_role author
author
author
dc.subject.none.fl_str_mv Medio Marino
Centro Oceanográfico de Vigo
Salinity
Temperature
Temporal series
Upwelling
NW Iberian Peninsula
Ria de Vigo
topic Medio Marino
Centro Oceanográfico de Vigo
Salinity
Temperature
Temporal series
Upwelling
NW Iberian Peninsula
Ria de Vigo
description From 1994 to 2006, we conducted a monthly series of CTD sampling along a coastal–shelf transect, in the Ria de Vigo and the adjacent shelf (NW Iberian Upwelling System; 42 to 44°N and 8 to 10°W). Our aim was to determine the spatial variability of the hydrographic processes over different timescales (seasonal and inter-annual) at 3 stations (ria, near-shore and shelf edge), and their relationship with other related oceanographic and climatic indices: upwelling index (UI) and North Atlantic Oscillation index (NAO). At a seasonal scale, a change in water temperature from inversion (December to February) to stratification (April to September) was found at all stations. The maximum vertical gradient in temperature is reached in July-August, coinciding with the middle of the upwelling season. The seasonal salinity cycle is influenced by continental runoff and, in winter time, by salty subtropical water carried alongshore by the Iberian Poleward Current. At an inter-annual scale, during spring-summer (upwelling season), in the upper layer of the ria station, a warming (0.06°C yr–1) is observed. This is in accordance with the multidecadal decreasing trend in upwelling intensity (~5 m3 s–1 km of coast–1 yr–1) that would have favoured a warming of surface coastal waters. In contrast, a surface temperature decrease (0.11°C yr–1) was observed at the shelf-edge station in the autumn-winter period (downscaling season). We hypothesise that the observed reduction in temperature is due to the combined effect of the increase in upwelling events during the downwelling season and the decline of NAO since 1995. No significant temporal trends on an inter-annual scale were found in salinity values in surface or bottom layers of the stations.
publishDate 2011
dc.date.none.fl_str_mv 2011
2023
2023
dc.type.none.fl_str_mv info:eu-repo/semantics/article
http://purl.org/coar/resource_type/c_6501
format article
dc.identifier.none.fl_str_mv http://hdl.handle.net/10261/322007
url http://hdl.handle.net/10261/322007
dc.language.none.fl_str_mv Inglés
language_invalid_str_mv Inglés
dc.relation.none.fl_str_mv Centro Oceanográfico de Vigo
https://doi.org/10.3354/cr00943
dc.rights.none.fl_str_mv info:eu-repo/semantics/openAccess
eu_rights_str_mv openAccess
dc.source.none.fl_str_mv reponame:DIGITAL.CSIC. Repositorio Institucional del CSIC
instname:Consejo Superior de Investigaciones Científicas (CSIC)
instname_str Consejo Superior de Investigaciones Científicas (CSIC)
reponame_str DIGITAL.CSIC. Repositorio Institucional del CSIC
collection DIGITAL.CSIC. Repositorio Institucional del CSIC
repository.name.fl_str_mv
repository.mail.fl_str_mv
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score 15,811543

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