Temporal variability of the meridional overturning circulation at 34.5°S: Results from two pilot boundary arrays in the South Atlantic

Autores
Meinen, Christopher S.; Speich, Sabrina; Perez, Renellys C.; Dong, Shenfu; Piola, Alberto Ricardo; Garzoli, Silvia L.; Baringer, Molly O.; Gladyshev, Sergey; Campos, Edmo
Año de publicación
2013
Idioma
inglés
Tipo de recurso
artículo
Estado
versión publicada
Descripción
Data from two boundary arrays deployed along 34.5°S are combined to produce the first continuous in situ time series observations of the basin-wide meridional overturning circulation (MOC) in the South Atlantic. Daily estimates of the MOC between March 2009 and December 2010 range between 3 Sv and 39 Sv (1 Sv = 106 m3 s-1) after a 10 day low-pass filter is applied. Much of the variability in this ∼20 month record occurs at periods shorter than 100 days. Approximately two-thirds of the MOC variability is due to changes in the geostrophic (baroclinic plus barotropic) volume transport, with the remainder associated with the direct wind-forced Ekman transport. When low-pass filtered to match previously published analyses in the North Atlantic, the observed temporal standard deviation at 34.5°S matches or somewhat exceeds that observed by time series observations at 16°N, 26.5°N, and 41°N. For periods shorter than 20 days the basin-wide MOC variations are most strongly influenced by Ekman flows, while at periods between 20 and 90 days the geostrophic flows tend to exert slightly more control over the total transport variability of the MOC. The geostrophic shear variations are roughly equally controlled by density variations on the western and eastern boundaries at all time scales captured in the record. The observed time-mean MOC vertical structure and temporal variability agree well with the limited independent observations available for confirmation. Key Points The MOC at 34.5S is highly variable, with a range of 30+ Sv during ~20 months MOC variations at 34.5S occur at periods ranging from a few days to a few months MOC estimates from the PIES moorings agree well with existing validation data
Fil: Meinen, Christopher S.. Atlantic Oceanographic and Meteorological Laboratory; Estados Unidos
Fil: Speich, Sabrina. University of Brest; Francia
Fil: Perez, Renellys C.. Atlantic Oceanographic and Meteorological Laboratory; Estados Unidos. University of Miami; Estados Unidos
Fil: Dong, Shenfu. Atlantic Oceanographic and Meteorological Laboratory; Estados Unidos. University of Miami; Estados Unidos
Fil: Piola, Alberto Ricardo. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina. Instituto Franco-Argentino Sobre Estudios del Clima y sus Impactos; Argentina. Universidad de Buenos Aires; Argentina
Fil: Garzoli, Silvia L.. Atlantic Oceanographic and Meteorological Laboratory; Estados Unidos. University of Miami; Estados Unidos
Fil: Baringer, Molly O.. Atlantic Oceanographic and Meteorological Laboratory; Estados Unidos
Fil: Gladyshev, Sergey. Shirshov Institute of Oceanology; Rusia
Fil: Campos, Edmo. Universidade de Sao Paulo; Brasil
Materia
BOTTOM PRESSURE
INVERTED ECHO SOUNDER
MERIDIONAL OVERTURNING CIRCULATION
SOUTH ATLANTIC
TRANSPORT
Nivel de accesibilidad
acceso abierto
Condiciones de uso
https://creativecommons.org/licenses/by-nc-sa/2.5/ar/
Repositorio
CONICET Digital (CONICET)
Institución
Consejo Nacional de Investigaciones Científicas y Técnicas
OAI Identificador
oai:ri.conicet.gov.ar:11336/89338

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network_name_str CONICET Digital (CONICET)
spelling Temporal variability of the meridional overturning circulation at 34.5°S: Results from two pilot boundary arrays in the South AtlanticMeinen, Christopher S.Speich, SabrinaPerez, Renellys C.Dong, ShenfuPiola, Alberto RicardoGarzoli, Silvia L.Baringer, Molly O.Gladyshev, SergeyCampos, EdmoBOTTOM PRESSUREINVERTED ECHO SOUNDERMERIDIONAL OVERTURNING CIRCULATIONSOUTH ATLANTICTRANSPORThttps://purl.org/becyt/ford/1.5https://purl.org/becyt/ford/1Data from two boundary arrays deployed along 34.5°S are combined to produce the first continuous in situ time series observations of the basin-wide meridional overturning circulation (MOC) in the South Atlantic. Daily estimates of the MOC between March 2009 and December 2010 range between 3 Sv and 39 Sv (1 Sv = 106 m3 s-1) after a 10 day low-pass filter is applied. Much of the variability in this ∼20 month record occurs at periods shorter than 100 days. Approximately two-thirds of the MOC variability is due to changes in the geostrophic (baroclinic plus barotropic) volume transport, with the remainder associated with the direct wind-forced Ekman transport. When low-pass filtered to match previously published analyses in the North Atlantic, the observed temporal standard deviation at 34.5°S matches or somewhat exceeds that observed by time series observations at 16°N, 26.5°N, and 41°N. For periods shorter than 20 days the basin-wide MOC variations are most strongly influenced by Ekman flows, while at periods between 20 and 90 days the geostrophic flows tend to exert slightly more control over the total transport variability of the MOC. The geostrophic shear variations are roughly equally controlled by density variations on the western and eastern boundaries at all time scales captured in the record. The observed time-mean MOC vertical structure and temporal variability agree well with the limited independent observations available for confirmation. Key Points The MOC at 34.5S is highly variable, with a range of 30+ Sv during ~20 months MOC variations at 34.5S occur at periods ranging from a few days to a few months MOC estimates from the PIES moorings agree well with existing validation dataFil: Meinen, Christopher S.. Atlantic Oceanographic and Meteorological Laboratory; Estados UnidosFil: Speich, Sabrina. University of Brest; FranciaFil: Perez, Renellys C.. Atlantic Oceanographic and Meteorological Laboratory; Estados Unidos. University of Miami; Estados UnidosFil: Dong, Shenfu. Atlantic Oceanographic and Meteorological Laboratory; Estados Unidos. University of Miami; Estados UnidosFil: Piola, Alberto Ricardo. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina. Instituto Franco-Argentino Sobre Estudios del Clima y sus Impactos; Argentina. Universidad de Buenos Aires; ArgentinaFil: Garzoli, Silvia L.. Atlantic Oceanographic and Meteorological Laboratory; Estados Unidos. University of Miami; Estados UnidosFil: Baringer, Molly O.. Atlantic Oceanographic and Meteorological Laboratory; Estados UnidosFil: Gladyshev, Sergey. Shirshov Institute of Oceanology; RusiaFil: Campos, Edmo. Universidade de Sao Paulo; BrasilAmerican Geophysical Union2013-12info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersionhttp://purl.org/coar/resource_type/c_6501info:ar-repo/semantics/articuloapplication/pdfapplication/pdfhttp://hdl.handle.net/11336/89338Meinen, Christopher S.; Speich, Sabrina; Perez, Renellys C.; Dong, Shenfu; Piola, Alberto Ricardo; et al.; Temporal variability of the meridional overturning circulation at 34.5°S: Results from two pilot boundary arrays in the South Atlantic; American Geophysical Union; Journal of Geophysical Research; 118; 12; 12-2013; 6461-64780148-02272169-9291CONICET DigitalCONICETenginfo:eu-repo/semantics/altIdentifier/url/https://agupubs.onlinelibrary.wiley.com/doi/full/10.1002/2013JC009228info:eu-repo/semantics/altIdentifier/doi/10.1002/2013JC009228info:eu-repo/semantics/openAccesshttps://creativecommons.org/licenses/by-nc-sa/2.5/ar/reponame:CONICET Digital (CONICET)instname:Consejo Nacional de Investigaciones Científicas y Técnicas2025-09-29T09:59:06Zoai:ri.conicet.gov.ar:11336/89338instacron: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 09:59:06.946CONICET Digital (CONICET) - Consejo Nacional de Investigaciones Científicas y Técnicasfalse
dc.title.none.fl_str_mv Temporal variability of the meridional overturning circulation at 34.5°S: Results from two pilot boundary arrays in the South Atlantic
title Temporal variability of the meridional overturning circulation at 34.5°S: Results from two pilot boundary arrays in the South Atlantic
spellingShingle Temporal variability of the meridional overturning circulation at 34.5°S: Results from two pilot boundary arrays in the South Atlantic
Meinen, Christopher S.
BOTTOM PRESSURE
INVERTED ECHO SOUNDER
MERIDIONAL OVERTURNING CIRCULATION
SOUTH ATLANTIC
TRANSPORT
title_short Temporal variability of the meridional overturning circulation at 34.5°S: Results from two pilot boundary arrays in the South Atlantic
title_full Temporal variability of the meridional overturning circulation at 34.5°S: Results from two pilot boundary arrays in the South Atlantic
title_fullStr Temporal variability of the meridional overturning circulation at 34.5°S: Results from two pilot boundary arrays in the South Atlantic
title_full_unstemmed Temporal variability of the meridional overturning circulation at 34.5°S: Results from two pilot boundary arrays in the South Atlantic
title_sort Temporal variability of the meridional overturning circulation at 34.5°S: Results from two pilot boundary arrays in the South Atlantic
dc.creator.none.fl_str_mv Meinen, Christopher S.
Speich, Sabrina
Perez, Renellys C.
Dong, Shenfu
Piola, Alberto Ricardo
Garzoli, Silvia L.
Baringer, Molly O.
Gladyshev, Sergey
Campos, Edmo
author Meinen, Christopher S.
author_facet Meinen, Christopher S.
Speich, Sabrina
Perez, Renellys C.
Dong, Shenfu
Piola, Alberto Ricardo
Garzoli, Silvia L.
Baringer, Molly O.
Gladyshev, Sergey
Campos, Edmo
author_role author
author2 Speich, Sabrina
Perez, Renellys C.
Dong, Shenfu
Piola, Alberto Ricardo
Garzoli, Silvia L.
Baringer, Molly O.
Gladyshev, Sergey
Campos, Edmo
author2_role author
author
author
author
author
author
author
author
dc.subject.none.fl_str_mv BOTTOM PRESSURE
INVERTED ECHO SOUNDER
MERIDIONAL OVERTURNING CIRCULATION
SOUTH ATLANTIC
TRANSPORT
topic BOTTOM PRESSURE
INVERTED ECHO SOUNDER
MERIDIONAL OVERTURNING CIRCULATION
SOUTH ATLANTIC
TRANSPORT
purl_subject.fl_str_mv https://purl.org/becyt/ford/1.5
https://purl.org/becyt/ford/1
dc.description.none.fl_txt_mv Data from two boundary arrays deployed along 34.5°S are combined to produce the first continuous in situ time series observations of the basin-wide meridional overturning circulation (MOC) in the South Atlantic. Daily estimates of the MOC between March 2009 and December 2010 range between 3 Sv and 39 Sv (1 Sv = 106 m3 s-1) after a 10 day low-pass filter is applied. Much of the variability in this ∼20 month record occurs at periods shorter than 100 days. Approximately two-thirds of the MOC variability is due to changes in the geostrophic (baroclinic plus barotropic) volume transport, with the remainder associated with the direct wind-forced Ekman transport. When low-pass filtered to match previously published analyses in the North Atlantic, the observed temporal standard deviation at 34.5°S matches or somewhat exceeds that observed by time series observations at 16°N, 26.5°N, and 41°N. For periods shorter than 20 days the basin-wide MOC variations are most strongly influenced by Ekman flows, while at periods between 20 and 90 days the geostrophic flows tend to exert slightly more control over the total transport variability of the MOC. The geostrophic shear variations are roughly equally controlled by density variations on the western and eastern boundaries at all time scales captured in the record. The observed time-mean MOC vertical structure and temporal variability agree well with the limited independent observations available for confirmation. Key Points The MOC at 34.5S is highly variable, with a range of 30+ Sv during ~20 months MOC variations at 34.5S occur at periods ranging from a few days to a few months MOC estimates from the PIES moorings agree well with existing validation data
Fil: Meinen, Christopher S.. Atlantic Oceanographic and Meteorological Laboratory; Estados Unidos
Fil: Speich, Sabrina. University of Brest; Francia
Fil: Perez, Renellys C.. Atlantic Oceanographic and Meteorological Laboratory; Estados Unidos. University of Miami; Estados Unidos
Fil: Dong, Shenfu. Atlantic Oceanographic and Meteorological Laboratory; Estados Unidos. University of Miami; Estados Unidos
Fil: Piola, Alberto Ricardo. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina. Instituto Franco-Argentino Sobre Estudios del Clima y sus Impactos; Argentina. Universidad de Buenos Aires; Argentina
Fil: Garzoli, Silvia L.. Atlantic Oceanographic and Meteorological Laboratory; Estados Unidos. University of Miami; Estados Unidos
Fil: Baringer, Molly O.. Atlantic Oceanographic and Meteorological Laboratory; Estados Unidos
Fil: Gladyshev, Sergey. Shirshov Institute of Oceanology; Rusia
Fil: Campos, Edmo. Universidade de Sao Paulo; Brasil
description Data from two boundary arrays deployed along 34.5°S are combined to produce the first continuous in situ time series observations of the basin-wide meridional overturning circulation (MOC) in the South Atlantic. Daily estimates of the MOC between March 2009 and December 2010 range between 3 Sv and 39 Sv (1 Sv = 106 m3 s-1) after a 10 day low-pass filter is applied. Much of the variability in this ∼20 month record occurs at periods shorter than 100 days. Approximately two-thirds of the MOC variability is due to changes in the geostrophic (baroclinic plus barotropic) volume transport, with the remainder associated with the direct wind-forced Ekman transport. When low-pass filtered to match previously published analyses in the North Atlantic, the observed temporal standard deviation at 34.5°S matches or somewhat exceeds that observed by time series observations at 16°N, 26.5°N, and 41°N. For periods shorter than 20 days the basin-wide MOC variations are most strongly influenced by Ekman flows, while at periods between 20 and 90 days the geostrophic flows tend to exert slightly more control over the total transport variability of the MOC. The geostrophic shear variations are roughly equally controlled by density variations on the western and eastern boundaries at all time scales captured in the record. The observed time-mean MOC vertical structure and temporal variability agree well with the limited independent observations available for confirmation. Key Points The MOC at 34.5S is highly variable, with a range of 30+ Sv during ~20 months MOC variations at 34.5S occur at periods ranging from a few days to a few months MOC estimates from the PIES moorings agree well with existing validation data
publishDate 2013
dc.date.none.fl_str_mv 2013-12
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/11336/89338
Meinen, Christopher S.; Speich, Sabrina; Perez, Renellys C.; Dong, Shenfu; Piola, Alberto Ricardo; et al.; Temporal variability of the meridional overturning circulation at 34.5°S: Results from two pilot boundary arrays in the South Atlantic; American Geophysical Union; Journal of Geophysical Research; 118; 12; 12-2013; 6461-6478
0148-0227
2169-9291
CONICET Digital
CONICET
url http://hdl.handle.net/11336/89338
identifier_str_mv Meinen, Christopher S.; Speich, Sabrina; Perez, Renellys C.; Dong, Shenfu; Piola, Alberto Ricardo; et al.; Temporal variability of the meridional overturning circulation at 34.5°S: Results from two pilot boundary arrays in the South Atlantic; American Geophysical Union; Journal of Geophysical Research; 118; 12; 12-2013; 6461-6478
0148-0227
2169-9291
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://agupubs.onlinelibrary.wiley.com/doi/full/10.1002/2013JC009228
info:eu-repo/semantics/altIdentifier/doi/10.1002/2013JC009228
dc.rights.none.fl_str_mv info:eu-repo/semantics/openAccess
https://creativecommons.org/licenses/by-nc-sa/2.5/ar/
eu_rights_str_mv openAccess
rights_invalid_str_mv https://creativecommons.org/licenses/by-nc-sa/2.5/ar/
dc.format.none.fl_str_mv application/pdf
application/pdf
dc.publisher.none.fl_str_mv American Geophysical Union
publisher.none.fl_str_mv American Geophysical Union
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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score 13.070432