The Evolution of Deep Ocean Chemistry and Respired Carbon in the Eastern Equatorial Pacific Over the Last Deglaciation

It has been shown that the deep Eastern Equatorial Pacific (EEP) region was poorly ventilated during the Last Glacial Maximum (LGM) relative to Holocene values. This finding suggests a more efficient biological pump, which indirectly supports the idea of increased carbon storage in the deep ocean co...

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Autores: De la Fuente, María, Calvo, Eva, Skinner, L., Pelejero Bou, Carles, Evans, David, Mueller, Wolfgang, Povea de Castro, Patricia, Cacho Lascorz, Isabel
Formato: artículo
Estado:Versión publicada
Fecha de publicación:2017
País:España
Recursos:Varias* (Consorci de Biblioteques Universitáries de Catalunya, Centre de Serveis Científics i Acadèmics de Catalunya)
Repositorio:Recercat. Dipósit de la Recerca de Catalunya
OAI Identifier:oai:recercat.cat:2445/175983
Acesso em linha:https://hdl.handle.net/2445/175983
Access Level:acceso abierto
Palavra-chave:Paleoceanografia
Pacífic, Oceà
Sediments marins
Circulació oceànica
Períodes glacials
Paleoceanography
Pacific Ocean
Marine sediments
Ocean circulation
Glacial epoch
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spelling The Evolution of Deep Ocean Chemistry and Respired Carbon in the Eastern Equatorial Pacific Over the Last DeglaciationDe la Fuente, MaríaCalvo, EvaSkinner, L.Pelejero Bou, CarlesEvans, DavidMueller, WolfgangPovea de Castro, PatriciaCacho Lascorz, IsabelPaleoceanografiaPacífic, OceàSediments marinsCirculació oceànicaPeríodes glacialsPaleoceanographyPacific OceanMarine sedimentsOcean circulationGlacial epochIt has been shown that the deep Eastern Equatorial Pacific (EEP) region was poorly ventilated during the Last Glacial Maximum (LGM) relative to Holocene values. This finding suggests a more efficient biological pump, which indirectly supports the idea of increased carbon storage in the deep ocean contributing to lower atmospheric CO2 during the last glacial. However, proxies related to respired carbon are needed in order to directly test this proposition. Here we present Cibicides wuellerstorfi B/Ca ratios from Ocean Drilling Program Site 1240 measured by laser ablation inductively coupled plasma mass spectrometry (LA-ICPMS) as a proxy for deep water carbonate saturation state ([CO32-], and therefore [CO32-]), along with C-13 measurements. In addition, the U/Ca ratio in foraminiferal coatings has been analyzed as an indicator of oxygenation changes. Our results show lower [CO32-], C-13, and [O-2] values during the LGM, which would be consistent with higher respired carbon levels in the deep EEP driven, at least in part, by reduced deep water ventilation. However, the difference between LGM and Holocene [CO32-] observed at our site is relatively small, in accordance with other records from across the Pacific, suggesting that a counteracting mechanism, such as seafloor carbonate dissolution, also played a role. If so, this mechanism would have increased average ocean alkalinity, allowing even more atmospheric CO2 to be sequestered by the ocean. Therefore, the deep Pacific Ocean very likely stored a significant amount of atmospheric CO2 during the LGM, specifically due to a more efficient biological carbon pump and also an increase in average ocean alkalinity.American Geophysical Union (AGU)2021202120172021info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersion15 p.application/pdfhttps://hdl.handle.net/2445/175983Articles publicats en revistes (Dinàmica de la Terra i l'Oceà)reponame:Recercat. Dipósit de la Recerca de Catalunyainstname:Varias* (Consorci de Biblioteques Universitáries de Catalunya, Centre de Serveis Científics i Acadèmics de Catalunya)InglésReproducció del document publicat a: https://doi.org/10.1002/2017PA003155Paleoceanography, 2017, vol. 32, num. 12, p. 1371-1385https://doi.org/10.1002/2017PA003155(c) American Geophysical Union (AGU), 2017info:eu-repo/semantics/openAccessoai:recercat.cat:2445/1759832026-05-29T05:05:01Z
dc.title.none.fl_str_mv The Evolution of Deep Ocean Chemistry and Respired Carbon in the Eastern Equatorial Pacific Over the Last Deglaciation
title The Evolution of Deep Ocean Chemistry and Respired Carbon in the Eastern Equatorial Pacific Over the Last Deglaciation
spellingShingle The Evolution of Deep Ocean Chemistry and Respired Carbon in the Eastern Equatorial Pacific Over the Last Deglaciation
De la Fuente, María
Paleoceanografia
Pacífic, Oceà
Sediments marins
Circulació oceànica
Períodes glacials
Paleoceanography
Pacific Ocean
Marine sediments
Ocean circulation
Glacial epoch
title_short The Evolution of Deep Ocean Chemistry and Respired Carbon in the Eastern Equatorial Pacific Over the Last Deglaciation
title_full The Evolution of Deep Ocean Chemistry and Respired Carbon in the Eastern Equatorial Pacific Over the Last Deglaciation
title_fullStr The Evolution of Deep Ocean Chemistry and Respired Carbon in the Eastern Equatorial Pacific Over the Last Deglaciation
title_full_unstemmed The Evolution of Deep Ocean Chemistry and Respired Carbon in the Eastern Equatorial Pacific Over the Last Deglaciation
title_sort The Evolution of Deep Ocean Chemistry and Respired Carbon in the Eastern Equatorial Pacific Over the Last Deglaciation
dc.creator.none.fl_str_mv De la Fuente, María
Calvo, Eva
Skinner, L.
Pelejero Bou, Carles
Evans, David
Mueller, Wolfgang
Povea de Castro, Patricia
Cacho Lascorz, Isabel
author De la Fuente, María
author_facet De la Fuente, María
Calvo, Eva
Skinner, L.
Pelejero Bou, Carles
Evans, David
Mueller, Wolfgang
Povea de Castro, Patricia
Cacho Lascorz, Isabel
author_role author
author2 Calvo, Eva
Skinner, L.
Pelejero Bou, Carles
Evans, David
Mueller, Wolfgang
Povea de Castro, Patricia
Cacho Lascorz, Isabel
author2_role author
author
author
author
author
author
author
dc.subject.none.fl_str_mv Paleoceanografia
Pacífic, Oceà
Sediments marins
Circulació oceànica
Períodes glacials
Paleoceanography
Pacific Ocean
Marine sediments
Ocean circulation
Glacial epoch
topic Paleoceanografia
Pacífic, Oceà
Sediments marins
Circulació oceànica
Períodes glacials
Paleoceanography
Pacific Ocean
Marine sediments
Ocean circulation
Glacial epoch
description It has been shown that the deep Eastern Equatorial Pacific (EEP) region was poorly ventilated during the Last Glacial Maximum (LGM) relative to Holocene values. This finding suggests a more efficient biological pump, which indirectly supports the idea of increased carbon storage in the deep ocean contributing to lower atmospheric CO2 during the last glacial. However, proxies related to respired carbon are needed in order to directly test this proposition. Here we present Cibicides wuellerstorfi B/Ca ratios from Ocean Drilling Program Site 1240 measured by laser ablation inductively coupled plasma mass spectrometry (LA-ICPMS) as a proxy for deep water carbonate saturation state ([CO32-], and therefore [CO32-]), along with C-13 measurements. In addition, the U/Ca ratio in foraminiferal coatings has been analyzed as an indicator of oxygenation changes. Our results show lower [CO32-], C-13, and [O-2] values during the LGM, which would be consistent with higher respired carbon levels in the deep EEP driven, at least in part, by reduced deep water ventilation. However, the difference between LGM and Holocene [CO32-] observed at our site is relatively small, in accordance with other records from across the Pacific, suggesting that a counteracting mechanism, such as seafloor carbonate dissolution, also played a role. If so, this mechanism would have increased average ocean alkalinity, allowing even more atmospheric CO2 to be sequestered by the ocean. Therefore, the deep Pacific Ocean very likely stored a significant amount of atmospheric CO2 during the LGM, specifically due to a more efficient biological carbon pump and also an increase in average ocean alkalinity.
publishDate 2017
dc.date.none.fl_str_mv 2017
2021
2021
2021
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/2445/175983
url https://hdl.handle.net/2445/175983
dc.language.none.fl_str_mv Inglés
language_invalid_str_mv Inglés
dc.relation.none.fl_str_mv Reproducció del document publicat a: https://doi.org/10.1002/2017PA003155
Paleoceanography, 2017, vol. 32, num. 12, p. 1371-1385
https://doi.org/10.1002/2017PA003155
dc.rights.none.fl_str_mv (c) American Geophysical Union (AGU), 2017
info:eu-repo/semantics/openAccess
rights_invalid_str_mv (c) American Geophysical Union (AGU), 2017
eu_rights_str_mv openAccess
dc.format.none.fl_str_mv 15 p.
application/pdf
dc.publisher.none.fl_str_mv American Geophysical Union (AGU)
publisher.none.fl_str_mv American Geophysical Union (AGU)
dc.source.none.fl_str_mv Articles publicats en revistes (Dinàmica de la Terra i l'Oceà)
reponame:Recercat. Dipósit de la Recerca de Catalunya
instname:Varias* (Consorci de Biblioteques Universitáries de Catalunya, Centre de Serveis Científics i Acadèmics de Catalunya)
instname_str Varias* (Consorci de Biblioteques Universitáries de Catalunya, Centre de Serveis Científics i Acadèmics de Catalunya)
reponame_str Recercat. Dipósit de la Recerca de Catalunya
collection Recercat. Dipósit de la Recerca de Catalunya
repository.name.fl_str_mv
repository.mail.fl_str_mv
_version_ 1869419527653031936
score 15,812429

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