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Atlantic circulation changes across a stadial-interstadial transition

2023-05Journal article Open access
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dc.contributor.authorWaelbroeck, Claire
dc.contributor.authorTjiputra, Jerry
dc.contributor.authorGuo, Chuncheng
dc.contributor.authorNisancioglu, Kerim H.
dc.contributor.authorJansen, Eystein
dc.contributor.authorRiveiros, Natalia Vazquez
dc.contributor.authorToucanne, Samuel
dc.contributor.authorEynaud, Frédérique
dc.contributor.authorRossignol, Linda
dc.contributor.authorDewilde, Fabien
dc.contributor.authorMarches, Elodie
dc.contributor.authorLebreiro, Susana
dc.contributor.authorNave, Silvia
dc.date.accessioned2023-09-18T15:52:28Z
dc.date.available2023-09-18T15:52:28Z
dc.date.issued2023-05
dc.description.abstractABSTRACT: We combine consistently dated benthic carbon isotopic records distributed over the entire Atlantic Ocean with numerical simulations performed by a glacial configuration of the Norwegian Earth System Model with active ocean biogeochemistry in order to interpret the observed Cibicides delta C-13 changes at the stadial-interstadial transition corresponding to the end of Heinrich Stadial 4 (HS4) in terms of ocean circulation and remineralization changes. We show that the marked increase in Cibicides delta C-13 observed at the end of HS4 between similar to 2000 and 4200 m in the Atlantic can be explained by changes in nutrient concentrations as simulated by the model in response to the halting of freshwater input in the high-latitude glacial North Atlantic. Our model results show that this Cibicides delta C-13 signal is associated with changes in the ratio of southern-sourced (SSW) versus northern-sourced (NSW) water masses at the core sites, whereby SSW is replaced by NSW as a consequence of the resumption of deep-water formation in the northern North Atlantic and Nordic Seas after the freshwater input is halted. Our results further suggest that the contribution of ocean circulation changes to this signal increases from similar to 40 % at 2000 m to similar to 80 % at 4000 m. Below similar to 4200 m, the model shows little ocean circulation change but an increase in remineralization across the transition marking the end of HS4. The simulated lower remineralization during stadials compared to during interstadials is particularly pronounced in deep subantarctic sites, in agreement with the decrease in the export production of carbon to the deep Southern Ocean during stadials found in previous studies.pt_PT
dc.description.versioninfo:eu-repo/semantics/publishedVersionpt_PT
dc.identifier.citationWaelbroeck, Claire... et.al - Atlantic circulation changes across a stadial-interstadial transition. In: Climate of the Past, 2023, vol. 19 (5), pp. 901-913pt_PT
dc.identifier.doi10.5194/cp-19-901-2023pt_PT
dc.identifier.eissn1814-9332
dc.identifier.issn1814-9324
dc.identifier.urihttp://hdl.handle.net/10400.9/4144
dc.language.isoengpt_PT
dc.peerreviewedyespt_PT
dc.publisherCopernicus Publicationspt_PT
dc.relationResearch Council of Norway (RNC - KLIMAFORSK contract nº 326603/E10)pt_PT
dc.rights.urihttp://creativecommons.org/licenses/by/4.0/pt_PT
dc.subjectDeep-Waterpt_PT
dc.subjectOcean circulationpt_PT
dc.subjectNorth-Atlanticpt_PT
dc.subjectNordic seaspt_PT
dc.subjectCarbon isotopespt_PT
dc.subjectStoragept_PT
dc.titleAtlantic circulation changes across a stadial-interstadial transitionpt_PT
dc.typejournal article
dspace.entity.typePublication
oaire.citation.endPage913pt_PT
oaire.citation.startPage901pt_PT
oaire.citation.titleClimate of the Pastpt_PT
oaire.citation.volume19pt_PT
person.familyNameNave
person.givenNameSilvia
person.identifier.orcid0000-0003-0845-1044
rcaap.rightsopenAccesspt_PT
rcaap.typearticlept_PT
relation.isAuthorOfPublication2aa72e5b-4ff0-4a16-ab0c-339d326967eb
relation.isAuthorOfPublication.latestForDiscovery2aa72e5b-4ff0-4a16-ab0c-339d326967eb

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