Logo do repositório
 
Publicação

Upper ocean instability in the subpolar north atlantic and its implications for deep water formation during interglacials

2025-02Artigo científico Acesso aberto
Ver registo simples
dc.contributor.authorThibodeau, Benoit
dc.contributor.authorDoherty, John M.
dc.contributor.authorAlonso-Garcia, Montserrat
dc.contributor.authorBand, Shraddha
dc.contributor.authorGonzález‐Lanchas, Alba
dc.contributor.authorNot, Christelle
dc.contributor.authorRen, Haojia
dc.date.accessioned2025-03-06T10:46:14Z
dc.date.available2025-03-06T10:46:14Z
dc.date.issued2025-02
dc.description.abstractIn this multiproxy study, we used new isotopic data on planktonic foraminifera to highlight the strong instability that characterized surface conditions in the Iceland Basin during Marine Isotope Stage 11 (MIS 11). We produced new oxygen isotope data on the planktonic species Neogloboquadrina incompta and Turborotalita quinqueloba, foraminifera-bound nitrogen isotope data on N. incompta, and calcareous nannofossil data at coring site IODP Site U1314. The multiproxy record displays two distinct upper ocean regimes: a relatively stable pre-climate optimum and an unstable post-climate optimum with high amplitude variations in nutrient utilization and seasonality proxies, and strong enrichment in oxygen isotopes suggesting colder and/or saltier upper waters. The latter regime was concomitant with a resurgence in ice-rafted debris. Interestingly, this surface instability is not observed in cores from sites affected by the North Atlantic Current. Moreover, deep water ventilation is reconstructed to decrease throughout the eastern North Atlantic, while remaining rather constant in the Labrador Sea. The evidence presented here indicates that deep-water formation was unstable throughout MIS 11, and that peak periods of deep-water formation varied across high latitude North Atlantic basins, depending on the prevailing surface conditions in each region. These findings suggest that reconstructing deep-water formation and ventilation require a comprehensive approach that accounts for the interconnectivity between different components of the overturning circulation system.eng
dc.description.sponsorship17301818; 17301320; PID2021-128322NB-I00
dc.identifier.doi10.1029/2024pa004935
dc.identifier.eissn2572-4525
dc.identifier.issn2572-4517
dc.identifier.urihttp://hdl.handle.net/10400.1/26857
dc.language.isoeng
dc.peerreviewedyes
dc.publisherAmerican Geophysical Union (AGU)
dc.relation.ispartofPaleoceanography and Paleoclimatology
dc.rights.urihttp://creativecommons.org/licenses/by-nc-nd/4.0/
dc.subjectMarine isotope stage 11
dc.subjectStable isotopes
dc.subjectInterglacials
dc.subjectNutrient utilization
dc.subjectClimate change
dc.titleUpper ocean instability in the subpolar north atlantic and its implications for deep water formation during interglacialseng
dc.typejournal article
dspace.entity.typePublication
oaire.citation.issue2
oaire.citation.startPagee2024PA004935
oaire.citation.titlePaleoceanography and Paleoclimatology
oaire.citation.volume40
oaire.versionhttp://purl.org/coar/version/c_970fb48d4fbd8a85
person.familyNameAlonso-Garcia
person.givenNameMontserrat
person.identifier.ciencia-id5B1B-33EE-50B9
person.identifier.orcid0000-0002-0241-2178
person.identifier.scopus-author-id51565655800
relation.isAuthorOfPublication7772f374-a9c2-41e7-a798-4d811b8a9a48
relation.isAuthorOfPublication.latestForDiscovery7772f374-a9c2-41e7-a798-4d811b8a9a48

Ficheiros

Principais
A mostrar 1 - 1 de 1
Miniatura
Nome:
Paleoceanog and Paleoclimatol - 2025 - Thibodeau - Upper Ocean Instability in the Subpolar North Atlantic and Its.pdf
Tamanho:
1.09 MB
Formato:
Adobe Portable Document Format
Ver/Abrir
Licença
A mostrar 1 - 1 de 1
Miniatura indisponível
Nome:
license.txt
Tamanho:
3.46 KB
Formato:
Item-specific license agreed upon to submission
Descrição:
Ver/Abrir

Coleções

CCM2-Artigos (em revistas ou actas indexadas)