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dc.contributor.authorEvans, David
dc.contributor.authorSagoo, Navjit
dc.contributor.authorRenema, Willem
dc.contributor.authorCotton, Laura J.
dc.contributor.authorMüller, Wolfgang
dc.contributor.authorTodd, Jonathan A.
dc.contributor.authorSaraswati, Pratul Kumar
dc.contributor.authorStassen, Peter
dc.contributor.authorZiegler, Martin
dc.contributor.authorPearson, Paul N.
dc.contributor.authorValdes, Paul J.
dc.contributor.authorAffek, Hagit P.
dc.date.accessioned2018-07-21T23:34:59Z
dc.date.available2018-07-21T23:34:59Z
dc.date.issued2018-02
dc.identifier.citationEvans , D , Sagoo , N , Renema , W , Cotton , L J , Müller , W , Todd , J A , Saraswati , P K , Stassen , P , Ziegler , M , Pearson , P N , Valdes , P J & Affek , H P 2018 , ' Eocene greenhouse climate revealed by coupled clumped isotope-Mg/Ca thermometry ' , Proceedings of the National Academy of Sciences of the United States of America , vol. 115 , no. 6 , pp. 1174-1179 . https://doi.org/10.1073/pnas.1714744115en
dc.identifier.issn0027-8424
dc.identifier.otherPURE: 252121437
dc.identifier.otherPURE UUID: 351b8416-5527-44d1-8265-e2942b34d28d
dc.identifier.otherRIS: urn:8C964F21D0C08B440A85A51E48744438
dc.identifier.otherPubMed: 29358374
dc.identifier.otherScopus: 85041528745
dc.identifier.otherWOS: 000424191300040
dc.identifier.urihttps://hdl.handle.net/10023/15626
dc.descriptionD.E. and H.P.A. acknowledge support from Yale University and the Yale Analytical and Stable Isotope Center and from Grant 171/16 of the Israel Science Foundation. W.R. and L.J.C. were supported by NWO Grant ALW 822 01 009. The Tanzania Commission for Science and Technology (COSTECH) and the Tanzania Petroleum Development Corporation supported the Tanzania Drilling Project (TDP) which recovered the Tanzanian specimens. Laser-ablation ICPMS work at RHUL was partly funded by a 2014 Natural Environment Research Council (NERC) Capital Equipment Grant (Ref. CC073). The Research Foundation Flanders is acknowledged for financial support (to P.S.). M.Z. acknowledges support from the Netherlands Earth System Science Center and Horizon 2020 Grant MSCA-IF-2014 655073.en
dc.description.abstractPast greenhouse periods with elevated atmospheric CO2 were characterized by globally warmer sea-surface temperatures (SST). However, the extent to which the high latitudes warmed to a greater degree than the tropics (polar amplification) remains poorly constrained, in particular because there are only a few temperature reconstructions from the tropics. Consequently, the relationship between increased CO2, the degree of tropical warming, and the resulting latitudinal SST gradient is not well known. Here, we present coupled clumped isotope (Δ47)-Mg/Ca measurements of foraminifera from a set of globally distributed sites in the tropics and midlatitudes. Δ47 is insensitive to seawater chemistry and therefore provides a robust constraint on tropical SST. Crucially, coupling these data with Mg/Ca measurements allows the precise reconstruction of Mg/Casw throughout the Eocene, enabling the reinterpretation of all planktonic foraminifera Mg/Ca data. The combined dataset constrains the range in Eocene tropical SST to 30–36 °C (from sites in all basins). We compare these accurate tropical SST to deep-ocean temperatures, serving as a minimum constraint on high-latitude SST. This results in a robust conservative reconstruction of the early Eocene latitudinal gradient, which was reduced by at least 32 ± 10% compared with present day, demonstrating greater polar amplification than captured by most climate models.
dc.format.extent6
dc.language.isoeng
dc.relation.ispartofProceedings of the National Academy of Sciences of the United States of Americaen
dc.rights© 2018 the Author(s). This work has been made available online in accordance with the publisher’s policies. This is the author created, accepted version 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/10.1073/pnas.1714744115en
dc.subjectClumped isotopeen
dc.subjectEoceneen
dc.subjectTropical sea-surface temperaturesen
dc.subjectPolar amplificationen
dc.subjectSeawater Mg/Caen
dc.subjectGE Environmental Sciencesen
dc.subjectQE Geologyen
dc.subjectDASen
dc.subjectSDG 13 - Climate Actionen
dc.subject.lccGEen
dc.subject.lccQEen
dc.titleEocene greenhouse climate revealed by coupled clumped isotope-Mg/Ca thermometryen
dc.typeJournal articleen
dc.description.versionPostprinten
dc.contributor.institutionUniversity of St Andrews. School of Earth & Environmental Sciencesen
dc.identifier.doihttps://doi.org/10.1073/pnas.1714744115
dc.description.statusPeer revieweden
dc.date.embargoedUntil2018-07-22


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