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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Centro Oceanográfico de Cádiz
2020
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ftieo:oai:repositorio.ieo.es:10508/12299 2023-05-15T17:34:04+02:00 On the seasonality of waters below the seasonal thermocline in the Gulf of Cádiz Sánchez-Leal, R.F. (Ricardo Félix) Bellanco, M.J. (María Jesús) Naranjo, C. (Cristina) García-Lafuente, J.M. (Jesús M.) González-Pola, C. (César) 2020-07-14 http://hdl.handle.net/10508/12299 https://doi.org/10.1016/j.csr.2020.104190 eng eng Centro Oceanográfico de Cádiz 0278-4343 http://hdl.handle.net/10508/12299 Continental Shelf Research, 204. 2020: 104190-104190 doi:10.1016/j.csr.2020.104190 Atribución-NoComercial-SinDerivadas 3.0 España http://creativecommons.org/licenses/by-nc-nd/3.0/es/ openAccess CC-BY-NC-ND physical oceanography seasonal thermocline thermocline seasonality continental shelves article 2020 ftieo https://doi.org/10.1016/j.csr.2020.104190 2022-07-26T23:49:22Z 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. Postprint 2,088 Article in Journal/Newspaper North Atlantic Instituto Español de Oceanografía: e-IEO Continental Shelf Research 204 104190 |
institution |
Open Polar |
collection |
Instituto Español de Oceanografía: e-IEO |
op_collection_id |
ftieo |
language |
English |
topic |
physical oceanography seasonal thermocline thermocline seasonality continental shelves |
spellingShingle |
physical oceanography seasonal thermocline thermocline seasonality continental shelves Sánchez-Leal, R.F. (Ricardo Félix) Bellanco, M.J. (María Jesús) Naranjo, C. (Cristina) García-Lafuente, J.M. (Jesús M.) González-Pola, C. (César) On the seasonality of waters below the seasonal thermocline in the Gulf of Cádiz |
topic_facet |
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. Postprint 2,088 |
format |
Article in Journal/Newspaper |
author |
Sánchez-Leal, R.F. (Ricardo Félix) Bellanco, M.J. (María Jesús) Naranjo, C. (Cristina) García-Lafuente, J.M. (Jesús M.) González-Pola, C. (César) |
author_facet |
Sánchez-Leal, R.F. (Ricardo Félix) Bellanco, M.J. (María Jesús) Naranjo, C. (Cristina) García-Lafuente, J.M. (Jesús M.) González-Pola, C. (César) |
author_sort |
Sánchez-Leal, R.F. (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 |
publisher |
Centro Oceanográfico de Cádiz |
publishDate |
2020 |
url |
http://hdl.handle.net/10508/12299 https://doi.org/10.1016/j.csr.2020.104190 |
genre |
North Atlantic |
genre_facet |
North Atlantic |
op_relation |
0278-4343 http://hdl.handle.net/10508/12299 Continental Shelf Research, 204. 2020: 104190-104190 doi:10.1016/j.csr.2020.104190 |
op_rights |
Atribución-NoComercial-SinDerivadas 3.0 España http://creativecommons.org/licenses/by-nc-nd/3.0/es/ openAccess |
op_rightsnorm |
CC-BY-NC-ND |
op_doi |
https://doi.org/10.1016/j.csr.2020.104190 |
container_title |
Continental Shelf Research |
container_volume |
204 |
container_start_page |
104190 |
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1766132762817855488 |