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

Planktonic d18O 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...

Descripción completa

Detalles Bibliográficos
Autores: Martínez-Méndez, Gema, Zahn, Rainer, Hall, Ian R., Peeters, Franck J. C., Pena González, Leopoldo David, Cacho Lascorz, Isabel, Negre, César
Tipo de recurso: artículo
Estado:Versión publicada
Fecha de publicación:2010
País:España
Institución:Universidad de Barcelona
Repositorio:Dipòsit Digital de la UB
OAI Identifier:oai:diposit.ub.edu:2445/98307
Acceso en línea:https://hdl.handle.net/2445/98307
Access Level:acceso abierto
Palabra clave:Paleoceanografia
Paleoclimatologia
Oceanografia química
Paleoceanography
Paleoclimatology
Chemical oceanography
id ES_6d9ff00a14a18932b3ef238458c82d02
oai_identifier_str oai:diposit.ub.edu:2445/98307
network_acronym_str ES
network_name_str España
repository_id_str
spelling Contrasting multi-proxy 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, Franck J. C.Pena González, Leopoldo DavidCacho Lascorz, IsabelNegre, CésarPaleoceanografiaPaleoclimatologiaOceanografia químicaPaleoceanographyPaleoclimatologyChemical oceanographyPlanktonic d18O 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/Caderived SST maximizes during glacial maxima and glacial Terminations to values about 2.5°C above fullinterglacial SST. The paired planktonic d18O and Mg/Ca‐derived SST records yield glacial seawater d18O 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 U37 K′ ‐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 U37 K′ 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.American Geophysical Union2010info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersionapplication/pdfhttps://hdl.handle.net/2445/98307Articles publicats en revistes (Dinàmica de la Terra i l'Oceà)reponame:Dipòsit Digital de la UBinstname:Universidad de BarcelonaInglésReproducció del document publicat a: http://dx.doi.org/10.1029/2009PA001879Paleoceanography, 2010, vol. 25, num. 5, p. 1-12http://dx.doi.org/10.1029/2009PA001879(c) American Geophysical Union, 2010info:eu-repo/semantics/openAccessoai:diposit.ub.edu:2445/983072026-05-27T06:46:51Z
dc.title.none.fl_str_mv Contrasting multi-proxy reconstructions of surface ocean hydrography in the Agulhas Corridor and implications for the Agulhas Leakage during the last 345,000 years
title Contrasting multi-proxy reconstructions of surface ocean hydrography in the Agulhas Corridor and implications for the Agulhas Leakage during the last 345,000 years
spellingShingle Contrasting multi-proxy reconstructions of surface ocean hydrography in the Agulhas Corridor and implications for the Agulhas Leakage during the last 345,000 years
Martínez-Méndez, Gema
Paleoceanografia
Paleoclimatologia
Oceanografia química
Paleoceanography
Paleoclimatology
Chemical oceanography
title_short Contrasting multi-proxy reconstructions of surface ocean hydrography in the Agulhas Corridor and implications for the Agulhas Leakage during the last 345,000 years
title_full Contrasting multi-proxy reconstructions of surface ocean hydrography in the Agulhas Corridor and implications for the Agulhas Leakage during the last 345,000 years
title_fullStr Contrasting multi-proxy 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 multi-proxy reconstructions of surface ocean hydrography in the Agulhas Corridor and implications for the Agulhas Leakage during the last 345,000 years
title_sort Contrasting multi-proxy 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, Franck J. C.
Pena González, Leopoldo David
Cacho Lascorz, Isabel
Negre, César
author Martínez-Méndez, Gema
author_facet Martínez-Méndez, Gema
Zahn, Rainer
Hall, Ian R.
Peeters, Franck J. C.
Pena González, Leopoldo David
Cacho Lascorz, Isabel
Negre, César
author_role author
author2 Zahn, Rainer
Hall, Ian R.
Peeters, Franck J. C.
Pena González, Leopoldo David
Cacho Lascorz, Isabel
Negre, César
author2_role author
author
author
author
author
author
dc.subject.none.fl_str_mv Paleoceanografia
Paleoclimatologia
Oceanografia química
Paleoceanography
Paleoclimatology
Chemical oceanography
topic Paleoceanografia
Paleoclimatologia
Oceanografia química
Paleoceanography
Paleoclimatology
Chemical oceanography
description Planktonic d18O 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/Caderived SST maximizes during glacial maxima and glacial Terminations to values about 2.5°C above fullinterglacial SST. The paired planktonic d18O and Mg/Ca‐derived SST records yield glacial seawater d18O 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 U37 K′ ‐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 U37 K′ 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 2010
dc.type.none.fl_str_mv info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
format article
status_str publishedVersion
dc.identifier.none.fl_str_mv https://hdl.handle.net/2445/98307
url https://hdl.handle.net/2445/98307
dc.language.none.fl_str_mv Inglés
language_invalid_str_mv Inglés
dc.relation.none.fl_str_mv Reproducció del document publicat a: http://dx.doi.org/10.1029/2009PA001879
Paleoceanography, 2010, vol. 25, num. 5, p. 1-12
http://dx.doi.org/10.1029/2009PA001879
dc.rights.none.fl_str_mv (c) American Geophysical Union, 2010
info:eu-repo/semantics/openAccess
rights_invalid_str_mv (c) American Geophysical Union, 2010
eu_rights_str_mv openAccess
dc.format.none.fl_str_mv 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 Articles publicats en revistes (Dinàmica de la Terra i l'Oceà)
reponame:Dipòsit Digital de la UB
instname:Universidad de Barcelona
instname_str Universidad de Barcelona
reponame_str Dipòsit Digital de la UB
collection Dipòsit Digital de la UB
repository.name.fl_str_mv
repository.mail.fl_str_mv
_version_ 1869410365818798080
score 15,300724

Similares en LA Referencia