On the seasonality of waters below the seasonal thermocline in the Gulf of Cádiz
This work examines the seasonal thermohaline variability in the Gulf of Cádiz (SW Iberian Peninsula) based on 2009–2020 repeated hydrographic observations. Subsurface water types are assorted within the mixing triangle formed by Mediterranean and Eastern North Atlantic Central Waters (ENACW). A shar...
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ftcsic:oai:digital.csic.es:10261/319019 2024-02-11T10:06:30+01:00 On the seasonality of waters below the seasonal thermocline in the Gulf of Cádiz Sánchez-Leal, Ricardo Félix Bellanco, María Jesús Naranjo, Cristina García-Lafuente, J.M. González-Pola, César 2020-07-14 http://hdl.handle.net/10508/12299 http://hdl.handle.net/10261/319019 https://doi.org/10.1016/j.csr.2020.104190 en eng Centro Oceanográfico de Cádiz Postprint Continental Shelf Research, 204. 2020: 104190-104190 0278-4343 http://hdl.handle.net/10508/12299 http://hdl.handle.net/10261/319019 doi:10.1016/j.csr.2020.104190 23230 open Centro Oceanográfico de Cádiz Medio Marino physical oceanography seasonal thermocline thermocline seasonality continental shelves artículo http://purl.org/coar/resource_type/c_6501 2020 ftcsic https://doi.org/10.1016/j.csr.2020.104190 2024-01-16T11:45:21Z This work examines the seasonal thermohaline variability in the Gulf of Cádiz (SW Iberian Peninsula) based on 2009–2020 repeated hydrographic observations. Subsurface water types are assorted within the mixing triangle formed by Mediterranean and Eastern North Atlantic Central Waters (ENACW). A sharp interface between 400-500 m depth separates the saline Mediterranean Overflow Waters (MOW) from the ENACW salinity minimum siting atop. The water column is warmer and more saline in winter (cooler, fresher in summer). Maximum differences of up to 0.6 ∘C and 0.15 emanate from the ENACW/MOW interface. Changes appear related to the wind-driven seasonal alternation of vertical displacement of isopycnals and poleward-equatorward transports. Upwelling-favorable winds in summer steer positive Ekman pumping velocities, which seem responsible for cooling over the ENACW salinity minimum. Below, the warm, saline signal of subtropical waters from the Azores current is attenuated by the summer approach of cooler, fresher waters from the Portugal Current system. The change of sign of Ekman pumping in winter suggests subsidence of isopycnals and warming/salinification under the seasonal thermocline. Seasonal thermohaline changes of waters leaving the Mediterranean Sea are insufficient to explain the variations under the ENACW/MOW interface. Rather, variability of Atlantic waters entrained by the overflow seem to dictate these differences. SI Article in Journal/Newspaper North Atlantic Digital.CSIC (Spanish National Research Council) Continental Shelf Research 204 104190 |
institution |
Open Polar |
collection |
Digital.CSIC (Spanish National Research Council) |
op_collection_id |
ftcsic |
language |
English |
topic |
Centro Oceanográfico de Cádiz Medio Marino physical oceanography seasonal thermocline thermocline seasonality continental shelves |
spellingShingle |
Centro Oceanográfico de Cádiz Medio Marino physical oceanography seasonal thermocline thermocline seasonality continental shelves Sánchez-Leal, Ricardo Félix Bellanco, María Jesús Naranjo, Cristina García-Lafuente, J.M. González-Pola, César On the seasonality of waters below the seasonal thermocline in the Gulf of Cádiz |
topic_facet |
Centro Oceanográfico de Cádiz Medio Marino physical oceanography seasonal thermocline thermocline seasonality continental shelves |
description |
This work examines the seasonal thermohaline variability in the Gulf of Cádiz (SW Iberian Peninsula) based on 2009–2020 repeated hydrographic observations. Subsurface water types are assorted within the mixing triangle formed by Mediterranean and Eastern North Atlantic Central Waters (ENACW). A sharp interface between 400-500 m depth separates the saline Mediterranean Overflow Waters (MOW) from the ENACW salinity minimum siting atop. The water column is warmer and more saline in winter (cooler, fresher in summer). Maximum differences of up to 0.6 ∘C and 0.15 emanate from the ENACW/MOW interface. Changes appear related to the wind-driven seasonal alternation of vertical displacement of isopycnals and poleward-equatorward transports. Upwelling-favorable winds in summer steer positive Ekman pumping velocities, which seem responsible for cooling over the ENACW salinity minimum. Below, the warm, saline signal of subtropical waters from the Azores current is attenuated by the summer approach of cooler, fresher waters from the Portugal Current system. The change of sign of Ekman pumping in winter suggests subsidence of isopycnals and warming/salinification under the seasonal thermocline. Seasonal thermohaline changes of waters leaving the Mediterranean Sea are insufficient to explain the variations under the ENACW/MOW interface. Rather, variability of Atlantic waters entrained by the overflow seem to dictate these differences. SI |
format |
Article in Journal/Newspaper |
author |
Sánchez-Leal, Ricardo Félix Bellanco, María Jesús Naranjo, Cristina García-Lafuente, J.M. González-Pola, César |
author_facet |
Sánchez-Leal, Ricardo Félix Bellanco, María Jesús Naranjo, Cristina García-Lafuente, J.M. González-Pola, César |
author_sort |
Sánchez-Leal, Ricardo Félix |
title |
On the seasonality of waters below the seasonal thermocline in the Gulf of Cádiz |
title_short |
On the seasonality of waters below the seasonal thermocline in the Gulf of Cádiz |
title_full |
On the seasonality of waters below the seasonal thermocline in the Gulf of Cádiz |
title_fullStr |
On the seasonality of waters below the seasonal thermocline in the Gulf of Cádiz |
title_full_unstemmed |
On the seasonality of waters below the seasonal thermocline in the Gulf of Cádiz |
title_sort |
on the seasonality of waters below the seasonal thermocline in the gulf of cádiz |
publishDate |
2020 |
url |
http://hdl.handle.net/10508/12299 http://hdl.handle.net/10261/319019 https://doi.org/10.1016/j.csr.2020.104190 |
genre |
North Atlantic |
genre_facet |
North Atlantic |
op_relation |
Centro Oceanográfico de Cádiz Postprint Continental Shelf Research, 204. 2020: 104190-104190 0278-4343 http://hdl.handle.net/10508/12299 http://hdl.handle.net/10261/319019 doi:10.1016/j.csr.2020.104190 23230 |
op_rights |
open |
op_doi |
https://doi.org/10.1016/j.csr.2020.104190 |
container_title |
Continental Shelf Research |
container_volume |
204 |
container_start_page |
104190 |
_version_ |
1790604263044415488 |