Enhanced deglacial carbon transport by Pacific southern-sourced intermediate and mode water

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dc.article.number5245
dc.catalogadordfo
dc.contributor.authorKaras, Cyrus
dc.contributor.authorNurnberg, Dirk
dc.contributor.authorLambert, Fabrice
dc.contributor.authorShaffer, Gary
dc.contributor.authorLamy, Frank
dc.date.accessioned2025-06-23T19:06:21Z
dc.date.available2025-06-23T19:06:21Z
dc.date.issued2025
dc.description.abstractSouthern-sourced Antarctic Intermediate Water (AAIW) and Subantarctic Mode Water (SAMW) are currently major sinks of atmospheric CO2. During the last deglaciation, atmospheric CO2 levels increased significantly during two specific time periods, Heinrich Stadial 1 (H1) ~18–14.6 ka BP (thousand years ago before present) and the Younger Dryas (YD) ~12.8–11.5 ka BP. Model simulation and proxy data studies suggest that AAIW/SAMW was crucial in explaining these changes during H1 and YD, but its variability and properties in the Southeast Pacific Ocean are still largely unknown. Here, we present records of benthic foraminiferal carbon isotopes, Mg/Ca-based water temperatures, paleosalinity reconstructions, and sortable silt mean grain size variations over the last 30 thousand years from Ocean Drilling Program (ODP) Site 1233, in the Southeast Pacific Ocean, which is bathed in AAIW/SAMW. Our proxy data suggest an increased northward circulation of high pCO2/ nutrient-enriched AAIW/SAMW during H1 and YD. Our data provides support for AAIW/SAMW as one of the important conduits for deglacial oceanic outgassing in the eastern equatorial Pacific upwelling.
dc.description.funderInternational Ocean Discovery Program
dc.description.funderDICYT-USACH
dc.description.funderANID-Fondecyt
dc.fechaingreso.objetodigital2025-06-23
dc.fuente.origenSCOPUS
dc.identifier.doi10.1038/s41467-025-60551-5
dc.identifier.issn20411723
dc.identifier.scopusidSCOPUS_ID:105007556048
dc.identifier.urihttps://doi.org/10.1038/s41467-025-60551-5
dc.identifier.urihttps://repositorio.uc.cl/handle/11534/104743
dc.information.autorucInstituto de Geografía; Lambert Fabrice; 0000-0002-2192-024X; 250043
dc.language.isoen
dc.nota.accesocontenido completo
dc.revistaNature Communications
dc.rightsacceso abierto
dc.rights.licenseAtribución/Reconocimiento-NoComercial-SinDerivados 4.0 Internacional
dc.rights.urihttps://creativecommons.org/licenses/by-nc-nd/4.0/deed.es
dc.subjectPalaeoceanography
dc.subjectPalaeoclimate
dc.subject.ddc550
dc.subject.deweyCiencias de la tierraes_ES
dc.subject.ods15 Life on land
dc.subject.odspa15 Vida de ecosistemas terrestres
dc.titleEnhanced deglacial carbon transport by Pacific southern-sourced intermediate and mode water
dc.typeartículo
dc.volumen16
sipa.codpersvinculados250043
sipa.trazabilidadSCOPUS;2025-06-15
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