Ocean productivity in the Gulf of Cadiz over the last 50 kyr

Detalhes bibliográficos
Autor(a) principal: Penaud, A.
Data de Publicação: 2022
Outros Autores: Eynaud, F., Etourneau, J., Bonnin, J., Vernal, A., Zaragosi, S., Kim, J.-H., Oliveira, Dulce, Waelbroeck, C.
Tipo de documento: Artigo
Idioma: eng
Título da fonte: Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos)
Texto Completo: http://hdl.handle.net/10400.1/17564
Resumo: Reconstructions of ocean primary productivity (PP) help to explain past and present biogeochemical cycles and climate changes in the oceans. We document PP variations over the last 50 kyr in a currently oligotrophic subtropical region, the Gulf of Cadiz. Data combine refined results from previous investigations on dinocyst assemblages, alkenones, and stable isotopes ( 18O, 13C) in planktonic (Globigerina bulloides) and endobenthic (Uvigerina mediterranea) foraminifera from cores MD04-2805 CQ and MD99-2339, with new isotopic measurements on epibenthic (Cibicides pachyderma–Cibicidoides wuellerstorfi) foraminifera and dinocyst-based estimates of PP using the new n = 1,968 modern database. We constrain PP variations and export production by integrating qualitative information from bio-indicators with dinocyst-based quantitative reconstructions such as PP and seasonal sea-surface temperature and information about remineralization from the benthic  13C (difference between epi- and endo-benthic foraminiferal  13C signatures). This study also includes new information on alkenone-based SST and total organic carbon which provides insights into the relationship between past regional hydrological activity and PP regime change. We show that PP, carbon export, and remineralization were generally high in the NE subtropical Atlantic Ocean during the last glacial period and that the Last Glacial Maximum (LGM) had lower  13C than the Heinrich Stadials with sustained high PP, likely allowing enhanced carbon sequestration. We link these PP periods to the dynamics of upwelling, active almost year-round during stadials, but restricted to spring-summer during interstadials and LGM, like today. During interstadials, nutrient advection through freshwater inputs during autumn–winter needs also to be considered to fully understand PP regimes.
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spelling Ocean productivity in the Gulf of Cadiz over the last 50 kyrDinocystsStable isotopesAlkenonesLast Glacial MaximumHeinrich StadialsPrimary productivityRemineralizationReconstructions of ocean primary productivity (PP) help to explain past and present biogeochemical cycles and climate changes in the oceans. We document PP variations over the last 50 kyr in a currently oligotrophic subtropical region, the Gulf of Cadiz. Data combine refined results from previous investigations on dinocyst assemblages, alkenones, and stable isotopes ( 18O, 13C) in planktonic (Globigerina bulloides) and endobenthic (Uvigerina mediterranea) foraminifera from cores MD04-2805 CQ and MD99-2339, with new isotopic measurements on epibenthic (Cibicides pachyderma–Cibicidoides wuellerstorfi) foraminifera and dinocyst-based estimates of PP using the new n = 1,968 modern database. We constrain PP variations and export production by integrating qualitative information from bio-indicators with dinocyst-based quantitative reconstructions such as PP and seasonal sea-surface temperature and information about remineralization from the benthic  13C (difference between epi- and endo-benthic foraminiferal  13C signatures). This study also includes new information on alkenone-based SST and total organic carbon which provides insights into the relationship between past regional hydrological activity and PP regime change. We show that PP, carbon export, and remineralization were generally high in the NE subtropical Atlantic Ocean during the last glacial period and that the Last Glacial Maximum (LGM) had lower  13C than the Heinrich Stadials with sustained high PP, likely allowing enhanced carbon sequestration. We link these PP periods to the dynamics of upwelling, active almost year-round during stadials, but restricted to spring-summer during interstadials and LGM, like today. During interstadials, nutrient advection through freshwater inputs during autumn–winter needs also to be considered to fully understand PP regimes.American Geophysical UnionSapientiaPenaud, A.Eynaud, F.Etourneau, J.Bonnin, J.Vernal, A.Zaragosi, S.Kim, J.-H.Oliveira, DulceWaelbroeck, C.2022-02-16T15:40:39Z2022-022022-02-07T16:41:11Z2022-02-01T00:00:00Zinfo:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/articleapplication/pdfhttp://hdl.handle.net/10400.1/17564eng2572-451710.1029/2021pa004316info:eu-repo/semantics/openAccessreponame:Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos)instname:Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informaçãoinstacron:RCAAP2024-11-29T10:37:07Zoai:sapientia.ualg.pt:10400.1/17564Portal AgregadorONGhttps://www.rcaap.pt/oai/openairemluisa.alvim@gmail.comopendoar:71602024-11-29T10:37:07Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) - Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informaçãofalse
dc.title.none.fl_str_mv Ocean productivity in the Gulf of Cadiz over the last 50 kyr
title Ocean productivity in the Gulf of Cadiz over the last 50 kyr
spellingShingle Ocean productivity in the Gulf of Cadiz over the last 50 kyr
Penaud, A.
Dinocysts
Stable isotopes
Alkenones
Last Glacial Maximum
Heinrich Stadials
Primary productivity
Remineralization
title_short Ocean productivity in the Gulf of Cadiz over the last 50 kyr
title_full Ocean productivity in the Gulf of Cadiz over the last 50 kyr
title_fullStr Ocean productivity in the Gulf of Cadiz over the last 50 kyr
title_full_unstemmed Ocean productivity in the Gulf of Cadiz over the last 50 kyr
title_sort Ocean productivity in the Gulf of Cadiz over the last 50 kyr
author Penaud, A.
author_facet Penaud, A.
Eynaud, F.
Etourneau, J.
Bonnin, J.
Vernal, A.
Zaragosi, S.
Kim, J.-H.
Oliveira, Dulce
Waelbroeck, C.
author_role author
author2 Eynaud, F.
Etourneau, J.
Bonnin, J.
Vernal, A.
Zaragosi, S.
Kim, J.-H.
Oliveira, Dulce
Waelbroeck, C.
author2_role author
author
author
author
author
author
author
author
dc.contributor.none.fl_str_mv Sapientia
dc.contributor.author.fl_str_mv Penaud, A.
Eynaud, F.
Etourneau, J.
Bonnin, J.
Vernal, A.
Zaragosi, S.
Kim, J.-H.
Oliveira, Dulce
Waelbroeck, C.
dc.subject.por.fl_str_mv Dinocysts
Stable isotopes
Alkenones
Last Glacial Maximum
Heinrich Stadials
Primary productivity
Remineralization
topic Dinocysts
Stable isotopes
Alkenones
Last Glacial Maximum
Heinrich Stadials
Primary productivity
Remineralization
description Reconstructions of ocean primary productivity (PP) help to explain past and present biogeochemical cycles and climate changes in the oceans. We document PP variations over the last 50 kyr in a currently oligotrophic subtropical region, the Gulf of Cadiz. Data combine refined results from previous investigations on dinocyst assemblages, alkenones, and stable isotopes ( 18O, 13C) in planktonic (Globigerina bulloides) and endobenthic (Uvigerina mediterranea) foraminifera from cores MD04-2805 CQ and MD99-2339, with new isotopic measurements on epibenthic (Cibicides pachyderma–Cibicidoides wuellerstorfi) foraminifera and dinocyst-based estimates of PP using the new n = 1,968 modern database. We constrain PP variations and export production by integrating qualitative information from bio-indicators with dinocyst-based quantitative reconstructions such as PP and seasonal sea-surface temperature and information about remineralization from the benthic  13C (difference between epi- and endo-benthic foraminiferal  13C signatures). This study also includes new information on alkenone-based SST and total organic carbon which provides insights into the relationship between past regional hydrological activity and PP regime change. We show that PP, carbon export, and remineralization were generally high in the NE subtropical Atlantic Ocean during the last glacial period and that the Last Glacial Maximum (LGM) had lower  13C than the Heinrich Stadials with sustained high PP, likely allowing enhanced carbon sequestration. We link these PP periods to the dynamics of upwelling, active almost year-round during stadials, but restricted to spring-summer during interstadials and LGM, like today. During interstadials, nutrient advection through freshwater inputs during autumn–winter needs also to be considered to fully understand PP regimes.
publishDate 2022
dc.date.none.fl_str_mv 2022-02-16T15:40:39Z
2022-02
2022-02-07T16:41:11Z
2022-02-01T00:00:00Z
dc.type.status.fl_str_mv info:eu-repo/semantics/publishedVersion
dc.type.driver.fl_str_mv info:eu-repo/semantics/article
format article
status_str publishedVersion
dc.identifier.uri.fl_str_mv http://hdl.handle.net/10400.1/17564
url http://hdl.handle.net/10400.1/17564
dc.language.iso.fl_str_mv eng
language eng
dc.relation.none.fl_str_mv 2572-4517
10.1029/2021pa004316
dc.rights.driver.fl_str_mv info:eu-repo/semantics/openAccess
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 reponame:Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos)
instname:Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informação
instacron:RCAAP
instname_str Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informação
instacron_str RCAAP
institution RCAAP
reponame_str Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos)
collection Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos)
repository.name.fl_str_mv Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) - Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informação
repository.mail.fl_str_mv mluisa.alvim@gmail.com
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