Contrasting multiproxy reconstructions of surface ocean hydrography in the Agulhas Corridor and implications for the Agulhas Leakage during the last 345,000 years

Planktonic δ18O and Mg/Ca-derived sea surface temperature (SST) records from the Agulhas Corridor off South Africa display a progressive increase of SST during glacial periods of the last three climatic cycles. The SST increases of up to 4°C coincide with increased abundance of subtropical planktoni...

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Autores: Martínez Méndez, Gema, Zahn, Rainer, Hall, Ian R., Peeters, Frank J. C., Pena, Leopoldo D.|||0000-0001-6414-6293, Cacho, Isabel|||0000-0002-6512-0770, Negre de Bofarull, César
Formato: artículo
Fecha de publicación:2010
País:España
Recursos:Universitat Autònoma de Barcelona
Repositorio:Dipòsit Digital de Documents de la UAB
Idioma:inglés
OAI Identifier:oai:ddd.uab.cat:25428
Acesso em linha:https://ddd.uab.cat/record/25428
https://dx.doi.org/urn:doi:10.1029/2009PA001879
Access Level:acceso abierto
Palavra-chave:Paleocirculation
Indian-Atlantic transport
Agulhas Corridor
Paleoclimatology
Paleoceanography
Marine geochemistry
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spelling Contrasting multiproxy reconstructions of surface ocean hydrography in the Agulhas Corridor and implications for the Agulhas Leakage during the last 345,000 yearsMartínez Méndez, GemaZahn, RainerHall, Ian R.Peeters, Frank J. C.Pena, Leopoldo D.|||0000-0001-6414-6293Cacho, Isabel|||0000-0002-6512-0770Negre de Bofarull, CésarPaleocirculationIndian-Atlantic transportAgulhas CorridorPaleoclimatologyPaleoceanographyMarine geochemistryPlanktonic δ18O and Mg/Ca-derived sea surface temperature (SST) records from the Agulhas Corridor off South Africa display a progressive increase of SST during glacial periods of the last three climatic cycles. The SST increases of up to 4°C coincide with increased abundance of subtropical planktonic foraminiferal marker species which indicates a progressive warming due to an increased influence of subtropical waters at the core sites. Mg/Ca-derived SST maximizes during glacial maxima and glacial Terminations to values about 2.5°C above full-interglacial SST. The paired planktonic δ18O and Mg/Ca-derived SST records yield glacial seawater δ18O anomalies of up to 0.8‰, indicating measurably higher surface salinities during these periods. The SST pattern along our record is markedly different from a U37K'-derived SST record at a nearby core location in the Agulhas Corridor that displays SST maxima only during glacial Terminations. Possible explanations are lateral alkenone advection by the vigorous regional ocean currents or the development of SST contrasts during glacials in association with seasonal changes of Agulhas water transports and lateral shifts of the Agulhas retroflection. The different SST reconstructions derived from U37K' and Mg/Ca pose a significant challenge to the interpretation of the proxy records and demonstrate that the reconstruction of the Agulhas Current and interocean salt leakage is not as straightforward as previously suggested. 22010-01-0120102010-01-01Articlehttp://purl.org/coar/resource_type/c_6501VoRhttp://purl.org/coar/version/c_970fb48d4fbd8a85info:eu-repo/semantics/articleapplication/pdfhttps://ddd.uab.cat/record/25428https://dx.doi.org/urn:doi:10.1029/2009PA001879reponame:Dipòsit Digital de Documents de la UABinstname:Universitat Autònoma de BarcelonaInglésengopen accesshttp://purl.org/coar/access_right/c_abf2Aquest material està protegit per drets d'autor i/o drets afins. Podeu utilitzar aquest material en funció del que permet la legislació de drets d'autor i drets afins d'aplicació al vostre cas. Per a d'altres usos heu d'obtenir permís del(s) titular(s) de drets.https://rightsstatements.org/vocab/InC/1.0/info:eu-repo/semantics/openAccessoai:ddd.uab.cat:254282026-06-06T12:50:31Z
dc.title.none.fl_str_mv Contrasting multiproxy reconstructions of surface ocean hydrography in the Agulhas Corridor and implications for the Agulhas Leakage during the last 345,000 years
title Contrasting multiproxy reconstructions of surface ocean hydrography in the Agulhas Corridor and implications for the Agulhas Leakage during the last 345,000 years
spellingShingle Contrasting multiproxy reconstructions of surface ocean hydrography in the Agulhas Corridor and implications for the Agulhas Leakage during the last 345,000 years
Martínez Méndez, Gema
Paleocirculation
Indian-Atlantic transport
Agulhas Corridor
Paleoclimatology
Paleoceanography
Marine geochemistry
title_short Contrasting multiproxy reconstructions of surface ocean hydrography in the Agulhas Corridor and implications for the Agulhas Leakage during the last 345,000 years
title_full Contrasting multiproxy reconstructions of surface ocean hydrography in the Agulhas Corridor and implications for the Agulhas Leakage during the last 345,000 years
title_fullStr Contrasting multiproxy reconstructions of surface ocean hydrography in the Agulhas Corridor and implications for the Agulhas Leakage during the last 345,000 years
title_full_unstemmed Contrasting multiproxy reconstructions of surface ocean hydrography in the Agulhas Corridor and implications for the Agulhas Leakage during the last 345,000 years
title_sort Contrasting multiproxy reconstructions of surface ocean hydrography in the Agulhas Corridor and implications for the Agulhas Leakage during the last 345,000 years
dc.creator.none.fl_str_mv Martínez Méndez, Gema
Zahn, Rainer
Hall, Ian R.
Peeters, Frank J. C.
Pena, Leopoldo D.|||0000-0001-6414-6293
Cacho, Isabel|||0000-0002-6512-0770
Negre de Bofarull, César
author Martínez Méndez, Gema
author_facet Martínez Méndez, Gema
Zahn, Rainer
Hall, Ian R.
Peeters, Frank J. C.
Pena, Leopoldo D.|||0000-0001-6414-6293
Cacho, Isabel|||0000-0002-6512-0770
Negre de Bofarull, César
author_role author
author2 Zahn, Rainer
Hall, Ian R.
Peeters, Frank J. C.
Pena, Leopoldo D.|||0000-0001-6414-6293
Cacho, Isabel|||0000-0002-6512-0770
Negre de Bofarull, César
author2_role author
author
author
author
author
author
dc.subject.none.fl_str_mv Paleocirculation
Indian-Atlantic transport
Agulhas Corridor
Paleoclimatology
Paleoceanography
Marine geochemistry
topic Paleocirculation
Indian-Atlantic transport
Agulhas Corridor
Paleoclimatology
Paleoceanography
Marine geochemistry
description Planktonic δ18O and Mg/Ca-derived sea surface temperature (SST) records from the Agulhas Corridor off South Africa display a progressive increase of SST during glacial periods of the last three climatic cycles. The SST increases of up to 4°C coincide with increased abundance of subtropical planktonic foraminiferal marker species which indicates a progressive warming due to an increased influence of subtropical waters at the core sites. Mg/Ca-derived SST maximizes during glacial maxima and glacial Terminations to values about 2.5°C above full-interglacial SST. The paired planktonic δ18O and Mg/Ca-derived SST records yield glacial seawater δ18O anomalies of up to 0.8‰, indicating measurably higher surface salinities during these periods. The SST pattern along our record is markedly different from a U37K'-derived SST record at a nearby core location in the Agulhas Corridor that displays SST maxima only during glacial Terminations. Possible explanations are lateral alkenone advection by the vigorous regional ocean currents or the development of SST contrasts during glacials in association with seasonal changes of Agulhas water transports and lateral shifts of the Agulhas retroflection. The different SST reconstructions derived from U37K' and Mg/Ca pose a significant challenge to the interpretation of the proxy records and demonstrate that the reconstruction of the Agulhas Current and interocean salt leakage is not as straightforward as previously suggested.
publishDate 2010
dc.date.none.fl_str_mv 2
2010-01-01
2010
2010-01-01
dc.type.none.fl_str_mv Article
http://purl.org/coar/resource_type/c_6501
VoR
http://purl.org/coar/version/c_970fb48d4fbd8a85
dc.type.openaire.fl_str_mv info:eu-repo/semantics/article
format article
dc.identifier.none.fl_str_mv https://ddd.uab.cat/record/25428
https://dx.doi.org/urn:doi:10.1029/2009PA001879
url https://ddd.uab.cat/record/25428
https://dx.doi.org/urn:doi:10.1029/2009PA001879
dc.language.none.fl_str_mv Inglés
eng
language_invalid_str_mv Inglés
language eng
dc.rights.none.fl_str_mv open access
http://purl.org/coar/access_right/c_abf2
https://rightsstatements.org/vocab/InC/1.0/
dc.rights.openaire.fl_str_mv info:eu-repo/semantics/openAccess
rights_invalid_str_mv open access
http://purl.org/coar/access_right/c_abf2
https://rightsstatements.org/vocab/InC/1.0/
eu_rights_str_mv openAccess
dc.format.none.fl_str_mv application/pdf
dc.source.none.fl_str_mv reponame:Dipòsit Digital de Documents de la UAB
instname:Universitat Autònoma de Barcelona
instname_str Universitat Autònoma de Barcelona
reponame_str Dipòsit Digital de Documents de la UAB
collection Dipòsit Digital de Documents de la UAB
repository.name.fl_str_mv
repository.mail.fl_str_mv
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