Characteristics and causes of Deep Western Boundary Current transport variability at 34.5° S during 2009-2014
- Autores
- Meinen, Christopher S.; Garzoli, Silvia L.; Perez, Renellys C.; Campos, Edmo; Piola, Alberto Ricardo; Chidichimo, María Paz; Dong, Shenfu; Sato, Olga T.
- Año de publicación
- 2017
- Idioma
- inglés
- Tipo de recurso
- artículo
- Estado
- versión publicada
- Descripción
- The Deep Western Boundary Current (DWBC) at 34.5° S in the South Atlantic carries a significant fraction of the cold deep limb of the Meridional Overturning Circulation (MOC), and therefore its variability affects the meridional heat transport and consequently the regional and global climate. Nearly 6 years of observations from a line of pressure-equipped inverted echo sounders (PIESs) have yielded an unprecedented data set for studying the characteristics of the time-varying DWBC volume transport at 34.5° S. Furthermore, the horizontal resolution of the observing array was greatly improved in December 2012 with the addition of two current-and-pressure-equipped inverted echo sounders (CPIESs) at the midpoints of the two westernmost pairs of PIES moorings. Regular hydrographic sections along the PIES/CPIES line confirm the presence of recently ventilated North Atlantic Deep Water carried by the DWBC. The time-mean absolute geostrophic transport integrated within the DWBC layer, defined between 800-4800 dbar and within longitude bounds of 51.5 to 44.5° W, is -15 Sv (1 Sv Combining double low line 106 m3 s-1; negative indicates southward flow). The observed peak-to-peak range in volume transport using these integration limits is from -89 to +50 Sv, and the temporal standard deviation is 23 Sv. Testing different vertical integration limits based on time-mean water-mass property levels yields small changes to these values, but no significant alteration to the character of the transport time series. The time-mean southward DWBC flow at this latitude is confined west of 49.5° W, with recirculations dominating the flow further offshore. As with other latitudes where the DWBC has been observed for multiple years, the time variability greatly exceeds the time mean, suggesting the presence of strong coherent vortices and/or Rossby Wave-like signals propagating to the boundary from the interior.
Fil: Meinen, Christopher S.. Atlantic Oceanographic and Meteorological Laboratory; Estados Unidos
Fil: Garzoli, Silvia L.. Atlantic Oceanographic and Meteorological Laboratory; Estados Unidos. University of Miami; Estados Unidos
Fil: Perez, Renellys C.. Atlantic Oceanographic and Meteorological Laboratory; Estados Unidos. University of Miami; Estados Unidos
Fil: Campos, Edmo. University of Miami; Estados Unidos. Universidade de Sao Paulo; Brasil
Fil: Piola, Alberto Ricardo. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina. Ministerio de Defensa. Armada Argentina. Servicio de Hidrografía Naval. Departamento Oceanografía; Argentina. Universidad de Buenos Aires; Argentina. Instituto Franco-Argentino sobre Estudios de Clima y sus Impactos; Argentina
Fil: Chidichimo, María Paz. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina. Ministerio de Defensa. Armada Argentina. Servicio de Hidrografía Naval. Departamento Oceanografía; Argentina. Universidad de Buenos Aires; Argentina. Instituto Franco-Argentino sobre Estudios de Clima y sus Impactos; Argentina
Fil: Dong, Shenfu. Atlantic Oceanographic and Meteorological Laboratory; Estados Unidos
Fil: Sato, Olga T.. Universidade de Sao Paulo; Brasil - Materia
-
DEEP WESTERN BOUNDARY CURRENT
VARIABILITY
SOUTH ATLANTIC
OBSERVATIONS - Nivel de accesibilidad
- acceso abierto
- Condiciones de uso
- https://creativecommons.org/licenses/by/2.5/ar/
- Repositorio
- Institución
- Consejo Nacional de Investigaciones Científicas y Técnicas
- OAI Identificador
- oai:ri.conicet.gov.ar:11336/72884
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oai:ri.conicet.gov.ar:11336/72884 |
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network_name_str |
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Characteristics and causes of Deep Western Boundary Current transport variability at 34.5° S during 2009-2014Meinen, Christopher S.Garzoli, Silvia L.Perez, Renellys C.Campos, EdmoPiola, Alberto RicardoChidichimo, María PazDong, ShenfuSato, Olga T.DEEP WESTERN BOUNDARY CURRENTVARIABILITYSOUTH ATLANTICOBSERVATIONShttps://purl.org/becyt/ford/1.5https://purl.org/becyt/ford/1The Deep Western Boundary Current (DWBC) at 34.5° S in the South Atlantic carries a significant fraction of the cold deep limb of the Meridional Overturning Circulation (MOC), and therefore its variability affects the meridional heat transport and consequently the regional and global climate. Nearly 6 years of observations from a line of pressure-equipped inverted echo sounders (PIESs) have yielded an unprecedented data set for studying the characteristics of the time-varying DWBC volume transport at 34.5° S. Furthermore, the horizontal resolution of the observing array was greatly improved in December 2012 with the addition of two current-and-pressure-equipped inverted echo sounders (CPIESs) at the midpoints of the two westernmost pairs of PIES moorings. Regular hydrographic sections along the PIES/CPIES line confirm the presence of recently ventilated North Atlantic Deep Water carried by the DWBC. The time-mean absolute geostrophic transport integrated within the DWBC layer, defined between 800-4800 dbar and within longitude bounds of 51.5 to 44.5° W, is -15 Sv (1 Sv Combining double low line 106 m3 s-1; negative indicates southward flow). The observed peak-to-peak range in volume transport using these integration limits is from -89 to +50 Sv, and the temporal standard deviation is 23 Sv. Testing different vertical integration limits based on time-mean water-mass property levels yields small changes to these values, but no significant alteration to the character of the transport time series. The time-mean southward DWBC flow at this latitude is confined west of 49.5° W, with recirculations dominating the flow further offshore. As with other latitudes where the DWBC has been observed for multiple years, the time variability greatly exceeds the time mean, suggesting the presence of strong coherent vortices and/or Rossby Wave-like signals propagating to the boundary from the interior.Fil: Meinen, Christopher S.. Atlantic Oceanographic and Meteorological Laboratory; Estados UnidosFil: Garzoli, Silvia L.. Atlantic Oceanographic and Meteorological Laboratory; Estados Unidos. University of Miami; Estados UnidosFil: Perez, Renellys C.. Atlantic Oceanographic and Meteorological Laboratory; Estados Unidos. University of Miami; Estados UnidosFil: Campos, Edmo. University of Miami; Estados Unidos. Universidade de Sao Paulo; BrasilFil: Piola, Alberto Ricardo. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina. Ministerio de Defensa. Armada Argentina. Servicio de Hidrografía Naval. Departamento Oceanografía; Argentina. Universidad de Buenos Aires; Argentina. Instituto Franco-Argentino sobre Estudios de Clima y sus Impactos; ArgentinaFil: Chidichimo, María Paz. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina. Ministerio de Defensa. Armada Argentina. Servicio de Hidrografía Naval. Departamento Oceanografía; Argentina. Universidad de Buenos Aires; Argentina. Instituto Franco-Argentino sobre Estudios de Clima y sus Impactos; ArgentinaFil: Dong, Shenfu. Atlantic Oceanographic and Meteorological Laboratory; Estados UnidosFil: Sato, Olga T.. Universidade de Sao Paulo; BrasilCopernicus Publications2017-03info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersionhttp://purl.org/coar/resource_type/c_6501info:ar-repo/semantics/articuloapplication/pdfapplication/pdfapplication/pdfhttp://hdl.handle.net/11336/72884Meinen, Christopher S.; Garzoli, Silvia L.; Perez, Renellys C.; Campos, Edmo; Piola, Alberto Ricardo; et al.; Characteristics and causes of Deep Western Boundary Current transport variability at 34.5° S during 2009-2014; Copernicus Publications; Ocean Science (os); 13; 1; 3-2017; 175-1941812-07841812-0792CONICET DigitalCONICETenginfo:eu-repo/semantics/altIdentifier/url/https://www.ocean-sci.net/13/175/2017/os-13-175-2017.htmlinfo:eu-repo/semantics/altIdentifier/doi/10.5194/os-13-175-2017info:eu-repo/semantics/openAccesshttps://creativecommons.org/licenses/by/2.5/ar/reponame:CONICET Digital (CONICET)instname:Consejo Nacional de Investigaciones Científicas y Técnicas2025-09-29T09:32:27Zoai:ri.conicet.gov.ar:11336/72884instacron: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 09:32:27.45CONICET Digital (CONICET) - Consejo Nacional de Investigaciones Científicas y Técnicasfalse |
dc.title.none.fl_str_mv |
Characteristics and causes of Deep Western Boundary Current transport variability at 34.5° S during 2009-2014 |
title |
Characteristics and causes of Deep Western Boundary Current transport variability at 34.5° S during 2009-2014 |
spellingShingle |
Characteristics and causes of Deep Western Boundary Current transport variability at 34.5° S during 2009-2014 Meinen, Christopher S. DEEP WESTERN BOUNDARY CURRENT VARIABILITY SOUTH ATLANTIC OBSERVATIONS |
title_short |
Characteristics and causes of Deep Western Boundary Current transport variability at 34.5° S during 2009-2014 |
title_full |
Characteristics and causes of Deep Western Boundary Current transport variability at 34.5° S during 2009-2014 |
title_fullStr |
Characteristics and causes of Deep Western Boundary Current transport variability at 34.5° S during 2009-2014 |
title_full_unstemmed |
Characteristics and causes of Deep Western Boundary Current transport variability at 34.5° S during 2009-2014 |
title_sort |
Characteristics and causes of Deep Western Boundary Current transport variability at 34.5° S during 2009-2014 |
dc.creator.none.fl_str_mv |
Meinen, Christopher S. Garzoli, Silvia L. Perez, Renellys C. Campos, Edmo Piola, Alberto Ricardo Chidichimo, María Paz Dong, Shenfu Sato, Olga T. |
author |
Meinen, Christopher S. |
author_facet |
Meinen, Christopher S. Garzoli, Silvia L. Perez, Renellys C. Campos, Edmo Piola, Alberto Ricardo Chidichimo, María Paz Dong, Shenfu Sato, Olga T. |
author_role |
author |
author2 |
Garzoli, Silvia L. Perez, Renellys C. Campos, Edmo Piola, Alberto Ricardo Chidichimo, María Paz Dong, Shenfu Sato, Olga T. |
author2_role |
author author author author author author author |
dc.subject.none.fl_str_mv |
DEEP WESTERN BOUNDARY CURRENT VARIABILITY SOUTH ATLANTIC OBSERVATIONS |
topic |
DEEP WESTERN BOUNDARY CURRENT VARIABILITY SOUTH ATLANTIC OBSERVATIONS |
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 Deep Western Boundary Current (DWBC) at 34.5° S in the South Atlantic carries a significant fraction of the cold deep limb of the Meridional Overturning Circulation (MOC), and therefore its variability affects the meridional heat transport and consequently the regional and global climate. Nearly 6 years of observations from a line of pressure-equipped inverted echo sounders (PIESs) have yielded an unprecedented data set for studying the characteristics of the time-varying DWBC volume transport at 34.5° S. Furthermore, the horizontal resolution of the observing array was greatly improved in December 2012 with the addition of two current-and-pressure-equipped inverted echo sounders (CPIESs) at the midpoints of the two westernmost pairs of PIES moorings. Regular hydrographic sections along the PIES/CPIES line confirm the presence of recently ventilated North Atlantic Deep Water carried by the DWBC. The time-mean absolute geostrophic transport integrated within the DWBC layer, defined between 800-4800 dbar and within longitude bounds of 51.5 to 44.5° W, is -15 Sv (1 Sv Combining double low line 106 m3 s-1; negative indicates southward flow). The observed peak-to-peak range in volume transport using these integration limits is from -89 to +50 Sv, and the temporal standard deviation is 23 Sv. Testing different vertical integration limits based on time-mean water-mass property levels yields small changes to these values, but no significant alteration to the character of the transport time series. The time-mean southward DWBC flow at this latitude is confined west of 49.5° W, with recirculations dominating the flow further offshore. As with other latitudes where the DWBC has been observed for multiple years, the time variability greatly exceeds the time mean, suggesting the presence of strong coherent vortices and/or Rossby Wave-like signals propagating to the boundary from the interior. Fil: Meinen, Christopher S.. Atlantic Oceanographic and Meteorological Laboratory; Estados Unidos Fil: Garzoli, Silvia L.. Atlantic Oceanographic and Meteorological Laboratory; Estados Unidos. University of Miami; Estados Unidos Fil: Perez, Renellys C.. Atlantic Oceanographic and Meteorological Laboratory; Estados Unidos. University of Miami; Estados Unidos Fil: Campos, Edmo. University of Miami; Estados Unidos. Universidade de Sao Paulo; Brasil Fil: Piola, Alberto Ricardo. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina. Ministerio de Defensa. Armada Argentina. Servicio de Hidrografía Naval. Departamento Oceanografía; Argentina. Universidad de Buenos Aires; Argentina. Instituto Franco-Argentino sobre Estudios de Clima y sus Impactos; Argentina Fil: Chidichimo, María Paz. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina. Ministerio de Defensa. Armada Argentina. Servicio de Hidrografía Naval. Departamento Oceanografía; Argentina. Universidad de Buenos Aires; Argentina. Instituto Franco-Argentino sobre Estudios de Clima y sus Impactos; Argentina Fil: Dong, Shenfu. Atlantic Oceanographic and Meteorological Laboratory; Estados Unidos Fil: Sato, Olga T.. Universidade de Sao Paulo; Brasil |
description |
The Deep Western Boundary Current (DWBC) at 34.5° S in the South Atlantic carries a significant fraction of the cold deep limb of the Meridional Overturning Circulation (MOC), and therefore its variability affects the meridional heat transport and consequently the regional and global climate. Nearly 6 years of observations from a line of pressure-equipped inverted echo sounders (PIESs) have yielded an unprecedented data set for studying the characteristics of the time-varying DWBC volume transport at 34.5° S. Furthermore, the horizontal resolution of the observing array was greatly improved in December 2012 with the addition of two current-and-pressure-equipped inverted echo sounders (CPIESs) at the midpoints of the two westernmost pairs of PIES moorings. Regular hydrographic sections along the PIES/CPIES line confirm the presence of recently ventilated North Atlantic Deep Water carried by the DWBC. The time-mean absolute geostrophic transport integrated within the DWBC layer, defined between 800-4800 dbar and within longitude bounds of 51.5 to 44.5° W, is -15 Sv (1 Sv Combining double low line 106 m3 s-1; negative indicates southward flow). The observed peak-to-peak range in volume transport using these integration limits is from -89 to +50 Sv, and the temporal standard deviation is 23 Sv. Testing different vertical integration limits based on time-mean water-mass property levels yields small changes to these values, but no significant alteration to the character of the transport time series. The time-mean southward DWBC flow at this latitude is confined west of 49.5° W, with recirculations dominating the flow further offshore. As with other latitudes where the DWBC has been observed for multiple years, the time variability greatly exceeds the time mean, suggesting the presence of strong coherent vortices and/or Rossby Wave-like signals propagating to the boundary from the interior. |
publishDate |
2017 |
dc.date.none.fl_str_mv |
2017-03 |
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/11336/72884 Meinen, Christopher S.; Garzoli, Silvia L.; Perez, Renellys C.; Campos, Edmo; Piola, Alberto Ricardo; et al.; Characteristics and causes of Deep Western Boundary Current transport variability at 34.5° S during 2009-2014; Copernicus Publications; Ocean Science (os); 13; 1; 3-2017; 175-194 1812-0784 1812-0792 CONICET Digital CONICET |
url |
http://hdl.handle.net/11336/72884 |
identifier_str_mv |
Meinen, Christopher S.; Garzoli, Silvia L.; Perez, Renellys C.; Campos, Edmo; Piola, Alberto Ricardo; et al.; Characteristics and causes of Deep Western Boundary Current transport variability at 34.5° S during 2009-2014; Copernicus Publications; Ocean Science (os); 13; 1; 3-2017; 175-194 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://www.ocean-sci.net/13/175/2017/os-13-175-2017.html info:eu-repo/semantics/altIdentifier/doi/10.5194/os-13-175-2017 |
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 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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13.070432 |