Inter-decadal changes in stratification and double diffusion in a transatlantic section along 7.5°N
Special volume: Advances in Spanish physical oceanography. Scientia Marina 76(Suppl.1) 2012.-- 19 pages, 15 figures, 3 tables [EN] We use three transatlantic cruises (1957, 1993 and 2010) along 7.5°N to analyse inter-decadal variations of the neutral buoyancy frequency (with neutral density replacin...
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Consejo Superior de Investigaciones Científicas (España)
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Online Access: | http://hdl.handle.net/10261/59767 https://doi.org/10.3989/scimar.03616.19G |
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ftcsic:oai:digital.csic.es:10261/59767 2024-02-11T09:58:16+01:00 Inter-decadal changes in stratification and double diffusion in a transatlantic section along 7.5°N Cambios interdecadales en estratificación y doble difusión en la sección transatlántica 7.5°N San Antolín Plaza, Miguel Ángel Pelegrí, Josep Lluís Machín, Francisco Benítez Barrios, Verónica 2012-09 http://hdl.handle.net/10261/59767 https://doi.org/10.3989/scimar.03616.19G en eng Consejo Superior de Investigaciones Científicas (España) https://doi.org/10.3989/scimar.03616.19G Scientia Marina 76(Suppl.1): 189-207 (2012) 0214-8358 http://hdl.handle.net/10261/59767 doi:10.3989/scimar.03616.19G 1886-8134 open Transatlantic section Stratification Neutral buoyancy frequency Inter-decadal changes Vertical diffusion Sección trasatlántica Estratificación Frecuencia de flotabilidad neutra Ángulo de Turner Variaciones interdecadales Difusión vertical artículo http://purl.org/coar/resource_type/c_6501 2012 ftcsic https://doi.org/10.3989/scimar.03616.19G 2024-01-16T09:42:01Z Special volume: Advances in Spanish physical oceanography. Scientia Marina 76(Suppl.1) 2012.-- 19 pages, 15 figures, 3 tables [EN] We use three transatlantic cruises (1957, 1993 and 2010) along 7.5°N to analyse inter-decadal variations of the neutral buoyancy frequency (with neutral density replacing potential density) and Turner angle. We also use Argo data from the 2003-2011 period to show that, within central and intermediate waters, the changes between the three sections are slightly greater than the seasonal and inter-annual variations, so they may be interpreted as actual inter-decadal variations. The results point to a generalized sinking of isoneutrals between 1957 and 2010, with maximum zonally-averaged values of about 100 m in the central and upper deep layers. They also reveal the occurrence of substantial changes in the intermediate and neighbouring water strata, with differential vertical sinking of isoneutrals and the transformation of their thermohaline characteristics. The neutral buoyancy frequency increased in the lower central and upper intermediate layers and decreased in the lower intermediate and upper deep layers. The distributions of Turner angle highlight a predominance of salt-fingering in the North Atlantic, except for a gravitationally doubly-stable layer located immediately below the intermediate water core; this stable layer thinned substantially between 1957 and 2010 because of the sinking of the lower intermediate isoneutrals acting together with actual water transformations from Antarctic Intermediate Waters into North Atlantic Deep Waters. We conclude that a significant portion of the water column underwent both increased vertical stratification and enhanced salt-fingering, two mechanisms with opposite effects on the effective vertical diffusion [ES] Usamos tres campañas transatlánticas (1957, 1993 y 2010) a lo largo de 7.5°N para analizar las variaciones interdecadales de la frecuencia de flotabilidad neutra (con la densidad neutra reemplazando a la densidad potencial) y el ... Article in Journal/Newspaper Antarc* Antarctic North Atlantic Digital.CSIC (Spanish National Research Council) Antarctic Doble ENVELOPE(-62.550,-62.550,-64.667,-64.667) Scientia Marina 76 S1 189 207 |
institution |
Open Polar |
collection |
Digital.CSIC (Spanish National Research Council) |
op_collection_id |
ftcsic |
language |
English |
topic |
Transatlantic section Stratification Neutral buoyancy frequency Inter-decadal changes Vertical diffusion Sección trasatlántica Estratificación Frecuencia de flotabilidad neutra Ángulo de Turner Variaciones interdecadales Difusión vertical |
spellingShingle |
Transatlantic section Stratification Neutral buoyancy frequency Inter-decadal changes Vertical diffusion Sección trasatlántica Estratificación Frecuencia de flotabilidad neutra Ángulo de Turner Variaciones interdecadales Difusión vertical San Antolín Plaza, Miguel Ángel Pelegrí, Josep Lluís Machín, Francisco Benítez Barrios, Verónica Inter-decadal changes in stratification and double diffusion in a transatlantic section along 7.5°N |
topic_facet |
Transatlantic section Stratification Neutral buoyancy frequency Inter-decadal changes Vertical diffusion Sección trasatlántica Estratificación Frecuencia de flotabilidad neutra Ángulo de Turner Variaciones interdecadales Difusión vertical |
description |
Special volume: Advances in Spanish physical oceanography. Scientia Marina 76(Suppl.1) 2012.-- 19 pages, 15 figures, 3 tables [EN] We use three transatlantic cruises (1957, 1993 and 2010) along 7.5°N to analyse inter-decadal variations of the neutral buoyancy frequency (with neutral density replacing potential density) and Turner angle. We also use Argo data from the 2003-2011 period to show that, within central and intermediate waters, the changes between the three sections are slightly greater than the seasonal and inter-annual variations, so they may be interpreted as actual inter-decadal variations. The results point to a generalized sinking of isoneutrals between 1957 and 2010, with maximum zonally-averaged values of about 100 m in the central and upper deep layers. They also reveal the occurrence of substantial changes in the intermediate and neighbouring water strata, with differential vertical sinking of isoneutrals and the transformation of their thermohaline characteristics. The neutral buoyancy frequency increased in the lower central and upper intermediate layers and decreased in the lower intermediate and upper deep layers. The distributions of Turner angle highlight a predominance of salt-fingering in the North Atlantic, except for a gravitationally doubly-stable layer located immediately below the intermediate water core; this stable layer thinned substantially between 1957 and 2010 because of the sinking of the lower intermediate isoneutrals acting together with actual water transformations from Antarctic Intermediate Waters into North Atlantic Deep Waters. We conclude that a significant portion of the water column underwent both increased vertical stratification and enhanced salt-fingering, two mechanisms with opposite effects on the effective vertical diffusion [ES] Usamos tres campañas transatlánticas (1957, 1993 y 2010) a lo largo de 7.5°N para analizar las variaciones interdecadales de la frecuencia de flotabilidad neutra (con la densidad neutra reemplazando a la densidad potencial) y el ... |
format |
Article in Journal/Newspaper |
author |
San Antolín Plaza, Miguel Ángel Pelegrí, Josep Lluís Machín, Francisco Benítez Barrios, Verónica |
author_facet |
San Antolín Plaza, Miguel Ángel Pelegrí, Josep Lluís Machín, Francisco Benítez Barrios, Verónica |
author_sort |
San Antolín Plaza, Miguel Ángel |
title |
Inter-decadal changes in stratification and double diffusion in a transatlantic section along 7.5°N |
title_short |
Inter-decadal changes in stratification and double diffusion in a transatlantic section along 7.5°N |
title_full |
Inter-decadal changes in stratification and double diffusion in a transatlantic section along 7.5°N |
title_fullStr |
Inter-decadal changes in stratification and double diffusion in a transatlantic section along 7.5°N |
title_full_unstemmed |
Inter-decadal changes in stratification and double diffusion in a transatlantic section along 7.5°N |
title_sort |
inter-decadal changes in stratification and double diffusion in a transatlantic section along 7.5°n |
publisher |
Consejo Superior de Investigaciones Científicas (España) |
publishDate |
2012 |
url |
http://hdl.handle.net/10261/59767 https://doi.org/10.3989/scimar.03616.19G |
long_lat |
ENVELOPE(-62.550,-62.550,-64.667,-64.667) |
geographic |
Antarctic Doble |
geographic_facet |
Antarctic Doble |
genre |
Antarc* Antarctic North Atlantic |
genre_facet |
Antarc* Antarctic North Atlantic |
op_relation |
https://doi.org/10.3989/scimar.03616.19G Scientia Marina 76(Suppl.1): 189-207 (2012) 0214-8358 http://hdl.handle.net/10261/59767 doi:10.3989/scimar.03616.19G 1886-8134 |
op_rights |
open |
op_doi |
https://doi.org/10.3989/scimar.03616.19G |
container_title |
Scientia Marina |
container_volume |
76 |
container_issue |
S1 |
container_start_page |
189 |
op_container_end_page |
207 |
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1790593887734071296 |