Deep Western Boundary Current transport variability in the South Atlantic: Preliminary results from a pilot array at 34.5° S

Autores
Meinen, C. S.; Piola, Alberto Ricardo; Perez, R. C.; Garzoli, S. L.
Año de publicación
2012
Idioma
inglés
Tipo de recurso
artículo
Estado
versión publicada
Descripción
The first direct estimates of the temporal variability of the absolute transport in the Deep Western Boundary Current (DWBC) at 34.5° S in the South Atlantic Ocean are obtained using just under one year of data from a line of four pressure-equipped inverted echo sounders. Hydrographic sections collected in 2009 and 2010 confirm, based on neutral density, temperature, salinity, and oxygen values, the presence of the DWBC, one of the main deep pathways of the Meridional Overturning Circulation. Both data sets indicate that the DWBC reconstitutes itself after breaking into eddies in the western sub-tropical Atlantic near 8° S. The amplitude and spectral character of the DWBC transport variability are comparable with those observed in the North Atlantic, where longer records exist, with the DWBC at 34.5° S exhibiting a transport standard deviation of 25 Sv and variations of ∼ 40 Sv occurring within periods as short as a few days. There is little indication of an annual cycle in the DWBC transports, although the observational records are too short to be definitive. A Monte Carlo-style analysis using 27 yr of model output from the same location as the observations indicates that about 48-60 months of data will be required to fully assess the deep transport variability. The model suggests the presence of an annual cycle in DWBC transport, however its statistical significance with even 27 yr of model output is low, suggesting that seasonal variations in the model are weak.
Fil: Meinen, C. S.. No especifíca;
Fil: Piola, Alberto Ricardo. Ministerio de Defensa. Armada Argentina. Servicio de Hidrografía Naval; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina
Fil: Perez, R. C.. No especifíca;
Fil: Garzoli, S. L.. No especifíca;
Materia
Deep Western Boundary Currents
Southwest Atlantic
Meridional Overturning Circulation
Nivel de accesibilidad
acceso abierto
Condiciones de uso
https://creativecommons.org/licenses/by/2.5/ar/
Repositorio
CONICET Digital (CONICET)
Institución
Consejo Nacional de Investigaciones Científicas y Técnicas
OAI Identificador
oai:ri.conicet.gov.ar:11336/198339

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spelling Deep Western Boundary Current transport variability in the South Atlantic: Preliminary results from a pilot array at 34.5° SMeinen, C. S.Piola, Alberto RicardoPerez, R. C.Garzoli, S. L.Deep Western Boundary CurrentsSouthwest AtlanticMeridional Overturning Circulationhttps://purl.org/becyt/ford/1.5https://purl.org/becyt/ford/1The first direct estimates of the temporal variability of the absolute transport in the Deep Western Boundary Current (DWBC) at 34.5° S in the South Atlantic Ocean are obtained using just under one year of data from a line of four pressure-equipped inverted echo sounders. Hydrographic sections collected in 2009 and 2010 confirm, based on neutral density, temperature, salinity, and oxygen values, the presence of the DWBC, one of the main deep pathways of the Meridional Overturning Circulation. Both data sets indicate that the DWBC reconstitutes itself after breaking into eddies in the western sub-tropical Atlantic near 8° S. The amplitude and spectral character of the DWBC transport variability are comparable with those observed in the North Atlantic, where longer records exist, with the DWBC at 34.5° S exhibiting a transport standard deviation of 25 Sv and variations of ∼ 40 Sv occurring within periods as short as a few days. There is little indication of an annual cycle in the DWBC transports, although the observational records are too short to be definitive. A Monte Carlo-style analysis using 27 yr of model output from the same location as the observations indicates that about 48-60 months of data will be required to fully assess the deep transport variability. The model suggests the presence of an annual cycle in DWBC transport, however its statistical significance with even 27 yr of model output is low, suggesting that seasonal variations in the model are weak.Fil: Meinen, C. S.. No especifíca;Fil: Piola, Alberto Ricardo. Ministerio de Defensa. Armada Argentina. Servicio de Hidrografía Naval; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas; ArgentinaFil: Perez, R. C.. No especifíca;Fil: Garzoli, S. L.. No especifíca;Copernicus Publications2012-11info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersionhttp://purl.org/coar/resource_type/c_6501info:ar-repo/semantics/articuloapplication/pdfapplication/pdfhttp://hdl.handle.net/11336/198339Meinen, C. S.; Piola, Alberto Ricardo; Perez, R. C.; Garzoli, S. L.; Deep Western Boundary Current transport variability in the South Atlantic: Preliminary results from a pilot array at 34.5° S; Copernicus Publications; Ocean Science (os); 8; 6; 11-2012; 1041-10541812-07841812-0792CONICET DigitalCONICETenginfo:eu-repo/semantics/altIdentifier/url/https://os.copernicus.org/articles/8/1041/2012/info:eu-repo/semantics/altIdentifier/doi/10.5194/os-8-1041-2012info:eu-repo/semantics/openAccesshttps://creativecommons.org/licenses/by/2.5/ar/reponame:CONICET Digital (CONICET)instname:Consejo Nacional de Investigaciones Científicas y Técnicas2025-09-29T10:42:14Zoai:ri.conicet.gov.ar:11336/198339instacron:CONICETInstitucionalhttp://ri.conicet.gov.ar/Organismo científico-tecnológicoNo correspondehttp://ri.conicet.gov.ar/oai/requestdasensio@conicet.gov.ar; lcarlino@conicet.gov.arArgentinaNo correspondeNo correspondeNo correspondeopendoar:34982025-09-29 10:42:14.875CONICET Digital (CONICET) - Consejo Nacional de Investigaciones Científicas y Técnicasfalse
dc.title.none.fl_str_mv Deep Western Boundary Current transport variability in the South Atlantic: Preliminary results from a pilot array at 34.5° S
title Deep Western Boundary Current transport variability in the South Atlantic: Preliminary results from a pilot array at 34.5° S
spellingShingle Deep Western Boundary Current transport variability in the South Atlantic: Preliminary results from a pilot array at 34.5° S
Meinen, C. S.
Deep Western Boundary Currents
Southwest Atlantic
Meridional Overturning Circulation
title_short Deep Western Boundary Current transport variability in the South Atlantic: Preliminary results from a pilot array at 34.5° S
title_full Deep Western Boundary Current transport variability in the South Atlantic: Preliminary results from a pilot array at 34.5° S
title_fullStr Deep Western Boundary Current transport variability in the South Atlantic: Preliminary results from a pilot array at 34.5° S
title_full_unstemmed Deep Western Boundary Current transport variability in the South Atlantic: Preliminary results from a pilot array at 34.5° S
title_sort Deep Western Boundary Current transport variability in the South Atlantic: Preliminary results from a pilot array at 34.5° S
dc.creator.none.fl_str_mv Meinen, C. S.
Piola, Alberto Ricardo
Perez, R. C.
Garzoli, S. L.
author Meinen, C. S.
author_facet Meinen, C. S.
Piola, Alberto Ricardo
Perez, R. C.
Garzoli, S. L.
author_role author
author2 Piola, Alberto Ricardo
Perez, R. C.
Garzoli, S. L.
author2_role author
author
author
dc.subject.none.fl_str_mv Deep Western Boundary Currents
Southwest Atlantic
Meridional Overturning Circulation
topic Deep Western Boundary Currents
Southwest Atlantic
Meridional Overturning Circulation
purl_subject.fl_str_mv https://purl.org/becyt/ford/1.5
https://purl.org/becyt/ford/1
dc.description.none.fl_txt_mv The first direct estimates of the temporal variability of the absolute transport in the Deep Western Boundary Current (DWBC) at 34.5° S in the South Atlantic Ocean are obtained using just under one year of data from a line of four pressure-equipped inverted echo sounders. Hydrographic sections collected in 2009 and 2010 confirm, based on neutral density, temperature, salinity, and oxygen values, the presence of the DWBC, one of the main deep pathways of the Meridional Overturning Circulation. Both data sets indicate that the DWBC reconstitutes itself after breaking into eddies in the western sub-tropical Atlantic near 8° S. The amplitude and spectral character of the DWBC transport variability are comparable with those observed in the North Atlantic, where longer records exist, with the DWBC at 34.5° S exhibiting a transport standard deviation of 25 Sv and variations of ∼ 40 Sv occurring within periods as short as a few days. There is little indication of an annual cycle in the DWBC transports, although the observational records are too short to be definitive. A Monte Carlo-style analysis using 27 yr of model output from the same location as the observations indicates that about 48-60 months of data will be required to fully assess the deep transport variability. The model suggests the presence of an annual cycle in DWBC transport, however its statistical significance with even 27 yr of model output is low, suggesting that seasonal variations in the model are weak.
Fil: Meinen, C. S.. No especifíca;
Fil: Piola, Alberto Ricardo. Ministerio de Defensa. Armada Argentina. Servicio de Hidrografía Naval; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina
Fil: Perez, R. C.. No especifíca;
Fil: Garzoli, S. L.. No especifíca;
description The first direct estimates of the temporal variability of the absolute transport in the Deep Western Boundary Current (DWBC) at 34.5° S in the South Atlantic Ocean are obtained using just under one year of data from a line of four pressure-equipped inverted echo sounders. Hydrographic sections collected in 2009 and 2010 confirm, based on neutral density, temperature, salinity, and oxygen values, the presence of the DWBC, one of the main deep pathways of the Meridional Overturning Circulation. Both data sets indicate that the DWBC reconstitutes itself after breaking into eddies in the western sub-tropical Atlantic near 8° S. The amplitude and spectral character of the DWBC transport variability are comparable with those observed in the North Atlantic, where longer records exist, with the DWBC at 34.5° S exhibiting a transport standard deviation of 25 Sv and variations of ∼ 40 Sv occurring within periods as short as a few days. There is little indication of an annual cycle in the DWBC transports, although the observational records are too short to be definitive. A Monte Carlo-style analysis using 27 yr of model output from the same location as the observations indicates that about 48-60 months of data will be required to fully assess the deep transport variability. The model suggests the presence of an annual cycle in DWBC transport, however its statistical significance with even 27 yr of model output is low, suggesting that seasonal variations in the model are weak.
publishDate 2012
dc.date.none.fl_str_mv 2012-11
dc.type.none.fl_str_mv info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
http://purl.org/coar/resource_type/c_6501
info:ar-repo/semantics/articulo
format article
status_str publishedVersion
dc.identifier.none.fl_str_mv http://hdl.handle.net/11336/198339
Meinen, C. S.; Piola, Alberto Ricardo; Perez, R. C.; Garzoli, S. L.; Deep Western Boundary Current transport variability in the South Atlantic: Preliminary results from a pilot array at 34.5° S; Copernicus Publications; Ocean Science (os); 8; 6; 11-2012; 1041-1054
1812-0784
1812-0792
CONICET Digital
CONICET
url http://hdl.handle.net/11336/198339
identifier_str_mv Meinen, C. S.; Piola, Alberto Ricardo; Perez, R. C.; Garzoli, S. L.; Deep Western Boundary Current transport variability in the South Atlantic: Preliminary results from a pilot array at 34.5° S; Copernicus Publications; Ocean Science (os); 8; 6; 11-2012; 1041-1054
1812-0784
1812-0792
CONICET Digital
CONICET
dc.language.none.fl_str_mv eng
language eng
dc.relation.none.fl_str_mv info:eu-repo/semantics/altIdentifier/url/https://os.copernicus.org/articles/8/1041/2012/
info:eu-repo/semantics/altIdentifier/doi/10.5194/os-8-1041-2012
dc.rights.none.fl_str_mv info:eu-repo/semantics/openAccess
https://creativecommons.org/licenses/by/2.5/ar/
eu_rights_str_mv openAccess
rights_invalid_str_mv https://creativecommons.org/licenses/by/2.5/ar/
dc.format.none.fl_str_mv application/pdf
application/pdf
dc.publisher.none.fl_str_mv Copernicus Publications
publisher.none.fl_str_mv Copernicus Publications
dc.source.none.fl_str_mv reponame:CONICET Digital (CONICET)
instname:Consejo Nacional de Investigaciones Científicas y Técnicas
reponame_str CONICET Digital (CONICET)
collection CONICET Digital (CONICET)
instname_str Consejo Nacional de Investigaciones Científicas y Técnicas
repository.name.fl_str_mv CONICET Digital (CONICET) - Consejo Nacional de Investigaciones Científicas y Técnicas
repository.mail.fl_str_mv dasensio@conicet.gov.ar; lcarlino@conicet.gov.ar
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