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dc.contributor.authorWilson, David
dc.contributor.authorStruve, Torben
dc.contributor.authorvan de Flierdt, Tina
dc.contributor.authorChen, Tianyu
dc.contributor.authorLi, Tao
dc.contributor.authorBurke, Andrea
dc.contributor.authorRobinson, Laura F.
dc.date.accessioned2021-06-16T23:37:52Z
dc.date.available2021-06-16T23:37:52Z
dc.date.issued2020-08-15
dc.identifier.citationWilson , D , Struve , T , van de Flierdt , T , Chen , T , Li , T , Burke , A & Robinson , L F 2020 , ' Sea-ice control on deglacial lower cell circulation changes recorded by Drake Passage deep-sea corals ' , Earth and Planetary Science Letters , vol. 544 , 116405 . https://doi.org/10.1016/j.epsl.2020.116405en
dc.identifier.issn0012-821X
dc.identifier.otherPURE: 268444347
dc.identifier.otherPURE UUID: 02305fe2-768b-49fc-a39c-1c184fb6091d
dc.identifier.otherORCID: /0000-0002-3754-1498/work/76387019
dc.identifier.otherScopus: 85086444621
dc.identifier.otherWOS: 000543825300029
dc.identifier.urihttp://hdl.handle.net/10023/23375
dc.descriptionFinancial support to DJW, TS, and TvdF was provided by the Natural Environment Research Council (NE/N001141/1), the Leverhulme Trust (RPG-398), the Grantham Institute for Climate Change and the Environment, and a Marie Curie Reintegration grant (IRG 230828). LFR acknowledges support from the Natural Environment Research Council (NE/N003861/1) and the European Research Council (278705).en
dc.description.abstractThe sequence of deep ocean circulation changes between the Last Glacial Maximum and the Holocene provides important insights for understanding deglacial climate change and the role of the deep ocean in the global carbon cycle. Although it is known that significant amounts of carbon were sequestered in a deep overturning cell during glacial periods and released during deglaciation, the driving mechanisms for these changes remain unresolved. Southern Ocean sea-ice has recently been proposed to play a critical role in setting the global deep ocean stratification and circulation, and hence carbon storage, but testing such conceptual and modelling studies requires data constraining past circulation changes. To this end, we present the first deglacial dataset of neodymium (Nd) isotopes measured on absolute-dated deep-sea corals from modern Lower Circumpolar Deep Water depths in the Drake Passage. Our record demonstrates deglacial variability of 2.5 εNd units, with radiogenic values of up to during the Last Glacial Maximum providing evidence for a stratified glacial circulation mode with restricted incorporation of Nd from North Atlantic Deep Water in the lower cell. During the deglaciation, a renewed Atlantic influence in the deep Southern Ocean is recorded early in Heinrich Stadial 1, coincident with Antarctic sea-ice retreat, and is followed by a brief return to more Pacific-like values during the Antarctic Cold Reversal. These changes demonstrate a strong influence of Southern Ocean processes in setting deep ocean circulation and support the proposed sea-ice control on deep ocean structure. Furthermore, by constraining the Nd isotopic composition of Lower Circumpolar Deep Water in the Southern Ocean, our new data are important for interpreting deglacial circulation changes in other ocean basins and support a spatially asynchronous return of North Atlantic Deep Water to the deep southeast and southwest Atlantic Ocean.
dc.language.isoeng
dc.relation.ispartofEarth and Planetary Science Lettersen
dc.rightsCopyright © 2020 Elsevier B.V. All rights reserved. This work has been made available online in accordance with publisher policies or with permission. Permission for further reuse of this content should be sought from the publisher or the rights holder. This is the author created accepted manuscript following peer review and may differ slightly from the final published version. The final published version of this work is available at https://doi.org/10.1016/j.epsl.2020.116405en
dc.subjectOcean circulationen
dc.subjectDeglaciationen
dc.subjectDrake Passageen
dc.subjectNd isotopesen
dc.subjectDeep-sea coralsen
dc.subjectSea-iceen
dc.subjectGE Environmental Sciencesen
dc.subjectDASen
dc.subject.lccGEen
dc.titleSea-ice control on deglacial lower cell circulation changes recorded by Drake Passage deep-sea coralsen
dc.typeJournal articleen
dc.description.versionPostprinten
dc.description.versionPostprinten
dc.contributor.institutionUniversity of St Andrews.School of Earth & Environmental Sciencesen
dc.contributor.institutionUniversity of St Andrews.St Andrews Isotope Geochemistryen
dc.identifier.doihttps://doi.org/10.1016/j.epsl.2020.116405
dc.description.statusPeer revieweden
dc.date.embargoedUntil2021-06-17


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