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dc.contributor.authorEzat, Mohamed
dc.contributor.authorRasmussen, Tine Lander
dc.contributor.authorSkinner, Luke C.
dc.contributor.authorZamelczyk, Katarzyna
dc.date.accessioned2019-07-31T08:31:37Z
dc.date.available2019-07-31T08:31:37Z
dc.date.issued2019-05-13
dc.description.abstractThe present-day ocean ventilation in the Arctic Mediterranean (Nordic Seas and Arctic Ocean), via transformation of northward inflowing warm Atlantic surface water into cold deep water, affects regional climate, atmospheric circulation and carbon storage in the deep ocean. Here we study the glacial evolution of the Arctic Mediterranean circulation and its influence on glacial climate using radiocarbon reservoir-age reconstructions on deep-sea cores from the Fram Strait that cover the late glacial period (33,000–20,000 yr ago; 33–20 ka). Our results show high Benthic-Planktic <sup>14</sup>C age differences of ∼1500 <sup>14</sup>C years 33–26.5 ka suggesting significant water column stratification between ∼100–2600 m water depth, and reduction and/or shoaling of deep-water formation. This phase was followed by breakup of the stratification during the Last Glacial Maximum (LGM; 26–20 ka), with Benthic-Planktic <sup>14</sup>C age differences of ∼250 <sup>14</sup>C years, likely due to enhanced upwelling. These ocean circulation changes potentially contributed to the final intensification phase of glaciation via positive cryosphere-atmosphereocean circulation-carbon cycle feedbacks. Our data also do not support ‘extreme aging’ of >6000 <sup>14</sup>C years in the deep Arctic Mediterranean, and appear to rule out the proposed outflow of very old Arctic Ocean water to the Nordic Seas during the LGM and to the subpolar North Atlantic Ocean during the deglacial period.en_US
dc.description.sponsorshipCo-funding of Regional, National, and International Programmes (COFUND) EU Seventh Framework Programme (FP7) Royal Society NERCen_US
dc.descriptionSource at <a href=https://doi.org/10.1016/j.epsl.2019.04.027>https://doi.org/10.1016/j.epsl.2019.04.027. </a>en_US
dc.identifier.citationEzat, M.M., Rasmussen, T.L., Skinner, L.C. & Zamelczyk, K. (2019). Deep ocean <sup>14</sup>C ventilation age reconstructions from the Arctic Mediterranean reassessed. <i>Earth and Planetary Science Letters, 518</i>, 67-75. https://doi.org/10.1016/j.epsl.2019.04.027en_US
dc.identifier.cristinIDFRIDAID 1697881
dc.identifier.issn0012-821X
dc.identifier.issn1385-013X
dc.identifier.urihttps://hdl.handle.net/10037/15814
dc.language.isoengen_US
dc.publisherElsevieren_US
dc.relation.journalEarth and Planetary Science Letters
dc.relation.projectIDinfo:eu-repo/grantAgreement/RCN/MARINFORSK/ 216538/Norway/Effects of ocean chemistry changes on planktic foraminifera in the Fram Strait: Ocean Acidification from natural to anthropogenic changes//en_US
dc.relation.projectIDinfo:eu-repo/grantAgreement/RCN/SFF/ 223259/Norway/Centre for Arctic Gas Hydrate, Environment and Climate/CAGE/en_US
dc.relation.projectIDinfo:eu-repo/grantAgreement/EC/FP7/274429/EU/?/?/en_US
dc.rights.accessRightsopenAccessen_US
dc.subjectVDP::Mathematics and natural science: 400::Geosciences: 450en_US
dc.subjectVDP::Matematikk og Naturvitenskap: 400::Geofag: 450en_US
dc.titleDeep ocean 14C ventilation age reconstructions from the Arctic Mediterranean reassesseden_US
dc.typeJournal articleen_US
dc.typeTidsskriftartikkelen_US
dc.typePeer revieweden_US


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