Holocene changes in Antarctic Intermediate Water flow strength in the Southwest Atlantic

Autores
Voigt, Ines; Chiessi, Cristiano Mazur; Piola, Alberto Ricardo; Henrich, Rüdiger
Año de publicación
2016
Idioma
inglés
Tipo de recurso
artículo
Estado
versión publicada
Descripción
Antarctic Intermediate Water (AAIW) is an essential component of the Atlantic meridional overturning circulation (AMOC) contributing to balance the southward flow of North Atlantic Deep Water (NADW). However, the role of AAIW in Holocene abrupt climate changes remains poorly understood. Here we reconstruct changes in the flow strength of AAIW based on a high temporal resolution paleocurrent record from the Southwest Atlantic. Superimposed on a slight increase in AAIW strength at ~ 7 ka BP, a succession of millennial-scale AAIW variations is recognized in our paleocurrent records indicating a highly variable intermediate water circulation throughout the Holocene. Although variations in the strength and position of the Southern Westerlies Winds (SWW) are proposed to greatly influence the formation and circulation of AAIW, we cannot confirm such a potential SWW-AAIW linkage since our records of AAIW flow strength do not correlate to Holocene shifts of the SWW across the Atlantic. However, our data shows a good correspondence with abrupt variations in the AMOC with enhanced (reduced) northward advection of AAIW during periods of reduced (enhanced) NADW circulation. These results provide evidence for a Holocene AAIW-NADW see-saw. Thus, although the exact forcing mechanism remains unresolved, we suggest that Holocene perturbations in AAIW exerted a significant impact on the AMOC.
Fil: Voigt, Ines. Universitat Bremen; Alemania
Fil: Chiessi, Cristiano Mazur. 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; Argentina
Fil: Henrich, Rüdiger. Universitat Bremen; Alemania
Materia
Antarctic Intermediate Water
Southwest Atlantic
Holocene
North Atlantic Deep Water
AAIW-NADW sea saw
Sortable Silt
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:11336/90814
Acceder
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oai_identifier_str oai:ri.conicet.gov.ar:11336/90814
network_acronym_str CONICETDig
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network_name_str CONICET Digital (CONICET)
spelling Holocene changes in Antarctic Intermediate Water flow strength in the Southwest AtlanticVoigt, InesChiessi, Cristiano MazurPiola, Alberto RicardoHenrich, RüdigerAntarctic Intermediate WaterSouthwest AtlanticHoloceneNorth Atlantic Deep WaterAAIW-NADW sea sawSortable Silthttps://purl.org/becyt/ford/1.5https://purl.org/becyt/ford/1Antarctic Intermediate Water (AAIW) is an essential component of the Atlantic meridional overturning circulation (AMOC) contributing to balance the southward flow of North Atlantic Deep Water (NADW). However, the role of AAIW in Holocene abrupt climate changes remains poorly understood. Here we reconstruct changes in the flow strength of AAIW based on a high temporal resolution paleocurrent record from the Southwest Atlantic. Superimposed on a slight increase in AAIW strength at ~ 7 ka BP, a succession of millennial-scale AAIW variations is recognized in our paleocurrent records indicating a highly variable intermediate water circulation throughout the Holocene. Although variations in the strength and position of the Southern Westerlies Winds (SWW) are proposed to greatly influence the formation and circulation of AAIW, we cannot confirm such a potential SWW-AAIW linkage since our records of AAIW flow strength do not correlate to Holocene shifts of the SWW across the Atlantic. However, our data shows a good correspondence with abrupt variations in the AMOC with enhanced (reduced) northward advection of AAIW during periods of reduced (enhanced) NADW circulation. These results provide evidence for a Holocene AAIW-NADW see-saw. Thus, although the exact forcing mechanism remains unresolved, we suggest that Holocene perturbations in AAIW exerted a significant impact on the AMOC.Fil: Voigt, Ines. Universitat Bremen; AlemaniaFil: Chiessi, Cristiano Mazur. 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; ArgentinaFil: Henrich, Rüdiger. Universitat Bremen; AlemaniaElsevier Science2016-12info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersionhttp://purl.org/coar/resource_type/c_6501info:ar-repo/semantics/articuloapplication/pdfapplication/pdfhttp://hdl.handle.net/11336/90814Voigt, Ines; Chiessi, Cristiano Mazur; Piola, Alberto Ricardo; Henrich, Rüdiger; Holocene changes in Antarctic Intermediate Water flow strength in the Southwest Atlantic; Elsevier Science; Palaeogeography, Palaeoclimatology, Palaeoecology; 463; 12-2016; 60-670031-0182CONICET DigitalCONICETenginfo:eu-repo/semantics/altIdentifier/url/http://www.sciencedirect.com/science/article/pii/S0031018216305089info:eu-repo/semantics/altIdentifier/doi/10.1016/j.palaeo.2016.09.018info:eu-repo/semantics/openAccesshttps://creativecommons.org/licenses/by-nc-sa/2.5/ar/reponame:CONICET Digital (CONICET)instname:Consejo Nacional de Investigaciones Científicas y Técnicas2025-10-22T11:27:23Zoai:ri.conicet.gov.ar:11336/90814instacron: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:34982025-10-22 11:27:23.973CONICET Digital (CONICET) - Consejo Nacional de Investigaciones Científicas y Técnicasfalse
dc.title.none.fl_str_mv Holocene changes in Antarctic Intermediate Water flow strength in the Southwest Atlantic
title Holocene changes in Antarctic Intermediate Water flow strength in the Southwest Atlantic
spellingShingle Holocene changes in Antarctic Intermediate Water flow strength in the Southwest Atlantic
Voigt, Ines
Antarctic Intermediate Water
Southwest Atlantic
Holocene
North Atlantic Deep Water
AAIW-NADW sea saw
Sortable Silt
title_short Holocene changes in Antarctic Intermediate Water flow strength in the Southwest Atlantic
title_full Holocene changes in Antarctic Intermediate Water flow strength in the Southwest Atlantic
title_fullStr Holocene changes in Antarctic Intermediate Water flow strength in the Southwest Atlantic
title_full_unstemmed Holocene changes in Antarctic Intermediate Water flow strength in the Southwest Atlantic
title_sort Holocene changes in Antarctic Intermediate Water flow strength in the Southwest Atlantic
dc.creator.none.fl_str_mv Voigt, Ines
Chiessi, Cristiano Mazur
Piola, Alberto Ricardo
Henrich, Rüdiger
author Voigt, Ines
author_facet Voigt, Ines
Chiessi, Cristiano Mazur
Piola, Alberto Ricardo
Henrich, Rüdiger
author_role author
author2 Chiessi, Cristiano Mazur
Piola, Alberto Ricardo
Henrich, Rüdiger
author2_role author
author
author
dc.subject.none.fl_str_mv Antarctic Intermediate Water
Southwest Atlantic
Holocene
North Atlantic Deep Water
AAIW-NADW sea saw
Sortable Silt
topic Antarctic Intermediate Water
Southwest Atlantic
Holocene
North Atlantic Deep Water
AAIW-NADW sea saw
Sortable Silt
purl_subject.fl_str_mv https://purl.org/becyt/ford/1.5
https://purl.org/becyt/ford/1
dc.description.none.fl_txt_mv Antarctic Intermediate Water (AAIW) is an essential component of the Atlantic meridional overturning circulation (AMOC) contributing to balance the southward flow of North Atlantic Deep Water (NADW). However, the role of AAIW in Holocene abrupt climate changes remains poorly understood. Here we reconstruct changes in the flow strength of AAIW based on a high temporal resolution paleocurrent record from the Southwest Atlantic. Superimposed on a slight increase in AAIW strength at ~ 7 ka BP, a succession of millennial-scale AAIW variations is recognized in our paleocurrent records indicating a highly variable intermediate water circulation throughout the Holocene. Although variations in the strength and position of the Southern Westerlies Winds (SWW) are proposed to greatly influence the formation and circulation of AAIW, we cannot confirm such a potential SWW-AAIW linkage since our records of AAIW flow strength do not correlate to Holocene shifts of the SWW across the Atlantic. However, our data shows a good correspondence with abrupt variations in the AMOC with enhanced (reduced) northward advection of AAIW during periods of reduced (enhanced) NADW circulation. These results provide evidence for a Holocene AAIW-NADW see-saw. Thus, although the exact forcing mechanism remains unresolved, we suggest that Holocene perturbations in AAIW exerted a significant impact on the AMOC.
Fil: Voigt, Ines. Universitat Bremen; Alemania
Fil: Chiessi, Cristiano Mazur. 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; Argentina
Fil: Henrich, Rüdiger. Universitat Bremen; Alemania
description Antarctic Intermediate Water (AAIW) is an essential component of the Atlantic meridional overturning circulation (AMOC) contributing to balance the southward flow of North Atlantic Deep Water (NADW). However, the role of AAIW in Holocene abrupt climate changes remains poorly understood. Here we reconstruct changes in the flow strength of AAIW based on a high temporal resolution paleocurrent record from the Southwest Atlantic. Superimposed on a slight increase in AAIW strength at ~ 7 ka BP, a succession of millennial-scale AAIW variations is recognized in our paleocurrent records indicating a highly variable intermediate water circulation throughout the Holocene. Although variations in the strength and position of the Southern Westerlies Winds (SWW) are proposed to greatly influence the formation and circulation of AAIW, we cannot confirm such a potential SWW-AAIW linkage since our records of AAIW flow strength do not correlate to Holocene shifts of the SWW across the Atlantic. However, our data shows a good correspondence with abrupt variations in the AMOC with enhanced (reduced) northward advection of AAIW during periods of reduced (enhanced) NADW circulation. These results provide evidence for a Holocene AAIW-NADW see-saw. Thus, although the exact forcing mechanism remains unresolved, we suggest that Holocene perturbations in AAIW exerted a significant impact on the AMOC.
publishDate 2016
dc.date.none.fl_str_mv 2016-12
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/11336/90814
Voigt, Ines; Chiessi, Cristiano Mazur; Piola, Alberto Ricardo; Henrich, Rüdiger; Holocene changes in Antarctic Intermediate Water flow strength in the Southwest Atlantic; Elsevier Science; Palaeogeography, Palaeoclimatology, Palaeoecology; 463; 12-2016; 60-67
0031-0182
CONICET Digital
CONICET
url http://hdl.handle.net/11336/90814
identifier_str_mv Voigt, Ines; Chiessi, Cristiano Mazur; Piola, Alberto Ricardo; Henrich, Rüdiger; Holocene changes in Antarctic Intermediate Water flow strength in the Southwest Atlantic; Elsevier Science; Palaeogeography, Palaeoclimatology, Palaeoecology; 463; 12-2016; 60-67
0031-0182
CONICET Digital
CONICET
dc.language.none.fl_str_mv eng
language eng
dc.relation.none.fl_str_mv info:eu-repo/semantics/altIdentifier/url/http://www.sciencedirect.com/science/article/pii/S0031018216305089
info:eu-repo/semantics/altIdentifier/doi/10.1016/j.palaeo.2016.09.018
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 Elsevier Science
publisher.none.fl_str_mv Elsevier Science
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 12.982451

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