Deep-sea benthic response to rapid climatic oscillations of the last glacial cycle in the SE Bay of Biscay

Paleoclimatic evolution of the last 140 ka (Marine Isotopic Stages MIS 1 to MIS 5) in the South Bay of Biscay has been studied by considering microfossil changes in sediment samples of deep core PP10-17. This core was retrieved at 2882 m water depth (mwd) in the Landas Plateau and is formed by 1792...

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Autores: Rodríguez Lázaro, Julio Manuel, Pascual Cuevas, Ana María, Cacho, I., Varela, Z., Pena, L.D.
Tipo de recurso: artículo
Fecha de publicación:2017
País:España
Institución:Universidad del País Vasco
Repositorio:Addi. Archivo Digital para la Docencia y la Investigación
OAI Identifier:oai:addi.ehu.eus:10810/65795
Acceso en línea:http://hdl.handle.net/10810/65795
Access Level:acceso abierto
Palabra clave:paleoclimatology
foraminifers
ostracods
benthic response
MIS 1–MIS 5
Bay of Biscay
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dc.title.none.fl_str_mv Deep-sea benthic response to rapid climatic oscillations of the last glacial cycle in the SE Bay of Biscay
title Deep-sea benthic response to rapid climatic oscillations of the last glacial cycle in the SE Bay of Biscay
spellingShingle Deep-sea benthic response to rapid climatic oscillations of the last glacial cycle in the SE Bay of Biscay
Rodríguez Lázaro, Julio Manuel
paleoclimatology
foraminifers
ostracods
benthic response
MIS 1–MIS 5
Bay of Biscay
title_short Deep-sea benthic response to rapid climatic oscillations of the last glacial cycle in the SE Bay of Biscay
title_full Deep-sea benthic response to rapid climatic oscillations of the last glacial cycle in the SE Bay of Biscay
title_fullStr Deep-sea benthic response to rapid climatic oscillations of the last glacial cycle in the SE Bay of Biscay
title_full_unstemmed Deep-sea benthic response to rapid climatic oscillations of the last glacial cycle in the SE Bay of Biscay
title_sort Deep-sea benthic response to rapid climatic oscillations of the last glacial cycle in the SE Bay of Biscay
dc.creator.none.fl_str_mv Rodríguez Lázaro, Julio Manuel
Pascual Cuevas, Ana María
Cacho, I.
Varela, Z.
Pena, L.D.
author Rodríguez Lázaro, Julio Manuel
author_facet Rodríguez Lázaro, Julio Manuel
Pascual Cuevas, Ana María
Cacho, I.
Varela, Z.
Pena, L.D.
author_role author
author2 Pascual Cuevas, Ana María
Cacho, I.
Varela, Z.
Pena, L.D.
author2_role author
author
author
author
dc.subject.none.fl_str_mv paleoclimatology
foraminifers
ostracods
benthic response
MIS 1–MIS 5
Bay of Biscay
topic paleoclimatology
foraminifers
ostracods
benthic response
MIS 1–MIS 5
Bay of Biscay
description Paleoclimatic evolution of the last 140 ka (Marine Isotopic Stages MIS 1 to MIS 5) in the South Bay of Biscay has been studied by considering microfossil changes in sediment samples of deep core PP10-17. This core was retrieved at 2882 m water depth (mwd) in the Landas Plateau and is formed by 1792 cm of clay-silt continuously deposited sediment. For this study, a total of 114 samples have been examined, yielding approximately 60 thousands of specimens of foraminifers (181 benthic species, BF) and ostracods (70 spp.). Reconstruction of the benthic response is based on the main foraminifer and ostracod species by considering their oxic/anoxic character as well as other ecological features of the assemblages. Detailed quantification of microfossils (planktonic and benthic foraminifers, ostracods) together with grain size analyses and magnetic susceptibility of the sediments allow us to characterize many of the climatic events registered in this core. Based on a robust chronostratigraphy by correlation with reference core MD95-2002 and Greenland ice core records (GICC05modelext), we are able to characterize a detailed response of benthic environments to cooling/warming, oxygen-content and productivity cycles in the region. MIS 5 has been characterized by oscillations of the planktonic/benthic foraminifer ratio (Oceanity index, OI; 60–90%); this index was higher (90–100%) and stable through the MIS 4–MIS 3 intervals. We found BF species indicators of different climatic-related events. Thus, MIS 5a, c, e interstadials are evidenced by Bulimina gibba and B. aculeata while the stadials MIS 5b, d are shown by the occurrence of Melonis pompilioides. Heinrich events, with massive iceberg discharges into the N Atlantic Ocean, are indicated by presence of Globobulimina affinis, particularly during the MIS 4 to MIS 2 interval. The beginning of MIS 4 is indicated by the appearance of new species of BF and an increase of Cassidulina laevigata. Krithe spp. and C. laevigata are good indicators of the LGM (Last Glacial Maximum, 19–23 ka) when the OI decreased. Other cooling periods (e.g. Younger Dryas, YD, around 12–13 ka) are shown as well by an increase of M. pompilioides, similar to that of the MIS 5d stadial. The Holocene (11.5 ka to present) is marked by an increase in the oceanity index, disappearance of cold-water indicators and the occurrence of Uvigerina peregrina. A shallow infaunal microhabitat of benthics foraminifers (Cibicides, Cassidulina, Uvigerina) and ostracods (Krithe, Argilloecia) has been linked to favorable bottom conditions, with oxic to slightly suboxic conditions (high diversity and equitability of assemblages) reflecting an active Atlantic Meridional Overturning Circulation (AMOC) during many D/O interstadials. The opposite conditions were established for deep infaunal BF (Bulimina, Globobulimina) where the strong dysoxic bottom conditions are indicative of poor ventilation produced by a reduction or shutdown of the AMOC during Heinrich stadials.
publishDate 2017
dc.date.none.fl_str_mv 2017
2024
2024
dc.type.none.fl_str_mv info:eu-repo/semantics/article
format article
dc.identifier.none.fl_str_mv http://hdl.handle.net/10810/65795
url http://hdl.handle.net/10810/65795
dc.language.none.fl_str_mv Inglés
language_invalid_str_mv Inglés
dc.relation.none.fl_str_mv info:eu-repo/grantAgreement/MINECO/CTM2013- 48639-C2-1-R/
info:eu-repo/grantAgreement/MINECO/CTM2016-75411-R/
https://www.sciencedirect.com/science/article/pii/S1385110116302969
dc.rights.none.fl_str_mv info:eu-repo/semantics/openAccess
http://creativecommons.org/licenses/by-nc-nd/4.0/
© 2017 Elsevier under CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/)
eu_rights_str_mv openAccess
rights_invalid_str_mv http://creativecommons.org/licenses/by-nc-nd/4.0/
© 2017 Elsevier under CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/)
dc.format.none.fl_str_mv application/pdf
dc.publisher.none.fl_str_mv Elsevier
publisher.none.fl_str_mv Elsevier
dc.source.none.fl_str_mv reponame:Addi. Archivo Digital para la Docencia y la Investigación
instname:Universidad del País Vasco
instname_str Universidad del País Vasco
reponame_str Addi. Archivo Digital para la Docencia y la Investigación
collection Addi. Archivo Digital para la Docencia y la Investigación
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spelling Deep-sea benthic response to rapid climatic oscillations of the last glacial cycle in the SE Bay of BiscayRodríguez Lázaro, Julio ManuelPascual Cuevas, Ana MaríaCacho, I.Varela, Z.Pena, L.D.paleoclimatologyforaminifersostracodsbenthic responseMIS 1–MIS 5Bay of BiscayPaleoclimatic evolution of the last 140 ka (Marine Isotopic Stages MIS 1 to MIS 5) in the South Bay of Biscay has been studied by considering microfossil changes in sediment samples of deep core PP10-17. This core was retrieved at 2882 m water depth (mwd) in the Landas Plateau and is formed by 1792 cm of clay-silt continuously deposited sediment. For this study, a total of 114 samples have been examined, yielding approximately 60 thousands of specimens of foraminifers (181 benthic species, BF) and ostracods (70 spp.). Reconstruction of the benthic response is based on the main foraminifer and ostracod species by considering their oxic/anoxic character as well as other ecological features of the assemblages. Detailed quantification of microfossils (planktonic and benthic foraminifers, ostracods) together with grain size analyses and magnetic susceptibility of the sediments allow us to characterize many of the climatic events registered in this core. Based on a robust chronostratigraphy by correlation with reference core MD95-2002 and Greenland ice core records (GICC05modelext), we are able to characterize a detailed response of benthic environments to cooling/warming, oxygen-content and productivity cycles in the region. MIS 5 has been characterized by oscillations of the planktonic/benthic foraminifer ratio (Oceanity index, OI; 60–90%); this index was higher (90–100%) and stable through the MIS 4–MIS 3 intervals. We found BF species indicators of different climatic-related events. Thus, MIS 5a, c, e interstadials are evidenced by Bulimina gibba and B. aculeata while the stadials MIS 5b, d are shown by the occurrence of Melonis pompilioides. Heinrich events, with massive iceberg discharges into the N Atlantic Ocean, are indicated by presence of Globobulimina affinis, particularly during the MIS 4 to MIS 2 interval. The beginning of MIS 4 is indicated by the appearance of new species of BF and an increase of Cassidulina laevigata. Krithe spp. and C. laevigata are good indicators of the LGM (Last Glacial Maximum, 19–23 ka) when the OI decreased. Other cooling periods (e.g. Younger Dryas, YD, around 12–13 ka) are shown as well by an increase of M. pompilioides, similar to that of the MIS 5d stadial. The Holocene (11.5 ka to present) is marked by an increase in the oceanity index, disappearance of cold-water indicators and the occurrence of Uvigerina peregrina. A shallow infaunal microhabitat of benthics foraminifers (Cibicides, Cassidulina, Uvigerina) and ostracods (Krithe, Argilloecia) has been linked to favorable bottom conditions, with oxic to slightly suboxic conditions (high diversity and equitability of assemblages) reflecting an active Atlantic Meridional Overturning Circulation (AMOC) during many D/O interstadials. The opposite conditions were established for deep infaunal BF (Bulimina, Globobulimina) where the strong dysoxic bottom conditions are indicative of poor ventilation produced by a reduction or shutdown of the AMOC during Heinrich stadials.This work was supported by the Spanish Ministry of Economy and Competitiveness MINECO (OPERA project, ref. CTM2013- 48639-C2-1- R and CHIMERA project, ref. CTM2016-75411-R), and by the HAREACoastal Geology Research Group (EJ/GV, IT976-16) and Formation and Research Unit in Quaternary: Environmental Changes and Human Fingerprint (UPV/EHU, UFI11/09) projects.Elsevier202420242017info:eu-repo/semantics/articleapplication/pdfhttp://hdl.handle.net/10810/65795reponame:Addi. Archivo Digital para la Docencia y la Investigacióninstname:Universidad del País VascoInglésinfo:eu-repo/grantAgreement/MINECO/CTM2013- 48639-C2-1-R/info:eu-repo/grantAgreement/MINECO/CTM2016-75411-R/https://www.sciencedirect.com/science/article/pii/S1385110116302969info:eu-repo/semantics/openAccesshttp://creativecommons.org/licenses/by-nc-nd/4.0/© 2017 Elsevier under CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/)oai:addi.ehu.eus:10810/657952026-06-18T09:23:17Z
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