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Reconstruction of deep-water undercurrent variability from the outer Labrador Sea during the past 550,000 years

2025-01Journal article Open access
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dc.contributor.authorKaboth-Bahr, Stefanie
dc.contributor.authorBahr, André
dc.contributor.authorBlaser, Patrick
dc.contributor.authorVoelker, Antje
dc.contributor.authorLippold, Jörg
dc.contributor.authorGutjahr, Marcus
dc.contributor.authorHodell, David A.
dc.contributor.authorChannell, James E.T.
dc.contributor.authorVernal, Anne de
dc.contributor.authorHillaire-Marcel, Claude
dc.date.accessioned2025-02-17T13:14:15Z
dc.date.available2025-02-17T13:14:15Z
dc.date.issued2025-01
dc.description.abstractWe present a comprehensive multi-proxy analysis spanning 550,000 years from the outer Labrador Sea region at the Integrated Ocean Drilling Program (IODP) Sites U1302/1303. We combine new benthic foraminiferal stable oxygen (delta 18O) and carbon (delta 13C) isotope records, with sediment elemental composition and authigenic neodymium isotope measurements, to provide insights into deep-water mass sourcing and changes of the Deep Western Boundary Current (DWBC), which exports North Atlantic Deep Water (NADW) into the wider North Atlantic as part of the lower limb of the Atlantic Meridional Overturning Circulation. We find that a prominent DWBC likely remained a persistent feature within the Labrador Sea region throughout the past 550 kyr. However, glacial peaks of marine isotope stage (MIS) 14 to MIS 2 were consistently characterized by a weaker or shallower DWBC, while all interglacial periods of MIS 13a to MIS 1, with the exception of MIS 7e, were marked by enhanced DWBC. Additionally, the dominant deep-water masses feeding into the DWBC during these glacial-interglacial periods varied from regional (K-rich sediment, unradiogenic epsilon Nd) to more distal sources from the Nordic Seas (Ti-rich sediment, radiogenic epsilon Nd). Yet, these changes in deep-water provenance did not consistently correlate with DWBC strength, suggesting that additional factors may have played a significant role in shaping the DWBC strength or core depth throughout the geological past.eng
dc.description.sponsorship101065424
dc.identifier.doi10.1016/j.qsa.2025.100266
dc.identifier.issn2666-0334
dc.identifier.urihttp://hdl.handle.net/10400.1/26804
dc.language.isoeng
dc.peerreviewedyes
dc.publisherElsevier
dc.relationAlgarve Centre for Marine Sciences
dc.relationAlgarve Centre for Marine Sciences
dc.relationCentre for Marine and Environmental Research
dc.relation.ispartofQuaternary Science Advances
dc.rights.urihttp://creativecommons.org/licenses/by/4.0/
dc.subjectMeridional overturning circulation
dc.subjectWestern boundary current
dc.subjectLast glacial
dc.titleReconstruction of deep-water undercurrent variability from the outer Labrador Sea during the past 550,000 yearseng
dc.typejournal article
dspace.entity.typePublication
oaire.awardTitleAlgarve Centre for Marine Sciences
oaire.awardTitleAlgarve Centre for Marine Sciences
oaire.awardTitleCentre for Marine and Environmental Research
oaire.awardURIinfo:eu-repo/grantAgreement/FCT/6817 - DCRRNI ID/UIDB%2F04326%2F2020/PT
oaire.awardURIinfo:eu-repo/grantAgreement/FCT/6817 - DCRRNI ID/UIDP%2F04326%2F2020/PT
oaire.awardURIinfo:eu-repo/grantAgreement/FCT/6817 - DCRRNI ID/LA%2FP%2F0101%2F2020/PT
oaire.citation.startPage100266
oaire.citation.titleQuarternary Science Advances
oaire.citation.volume17
oaire.fundingStream6817 - DCRRNI ID
oaire.fundingStream6817 - DCRRNI ID
oaire.fundingStream6817 - DCRRNI ID
oaire.versionhttp://purl.org/coar/version/c_970fb48d4fbd8a85
person.familyNameVoelker
person.givenNameAntje
person.identifier2315310
person.identifier.ciencia-idC11E-D8E6-CDFA
person.identifier.orcid0000-0001-6465-6023
person.identifier.ridC-5427-2012
person.identifier.scopus-author-id8784446000
project.funder.identifierhttp://doi.org/10.13039/501100001871
project.funder.identifierhttp://doi.org/10.13039/501100001871
project.funder.identifierhttp://doi.org/10.13039/501100001871
project.funder.nameFundação para a Ciência e a Tecnologia
project.funder.nameFundação para a Ciência e a Tecnologia
project.funder.nameFundação para a Ciência e a Tecnologia
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