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dc.contributor.authorEvans, D
dc.contributor.authorSagoo, N
dc.contributor.authorRenema, W
dc.contributor.authorCotton, LJ
dc.contributor.authorMüller, W
dc.contributor.authorTodd, JA
dc.contributor.authorKumar Saraswati, P
dc.contributor.authorStassen, P
dc.contributor.authorZiegler, M
dc.contributor.authorPearson, PN
dc.contributor.authorValdes, PJ
dc.contributor.authorAffek, HP
dc.date.accessioned2019-04-29T15:29:56Z
dc.date.available2019-04-29T15:29:56Z
dc.date.issued2018-01-22
dc.date.submitted2018-01-25
dc.identifier.citationEvans, D., N. Sagoo, et al. (2018). "Eocene greenhouse climate revealed by coupled clumped isotope-Mg/Ca thermometry." Proceedings of the National Academy of Sciences 115(6): 1174-1179.en_US
dc.identifier.issn0027-8424
dc.identifier.doi10.1073/pnas.1714744115
dc.identifier.urihttp://hdl.handle.net/10141/622509
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.en_US
dc.publisherPNASen_US
dc.rightsclosedAccessen_US
dc.titleEocene greenhouse climate revealed by coupled clumped isotope-Mg/Ca thermometryen_US
dc.typeJournal Articleen_US
dc.identifier.eissn1091-6490
dc.identifier.journalProceedings of the National Academy of Sciencesen_US
dc.identifier.volume115en_US
dc.identifier.issue6en_US
dc.identifier.startpage1174 - 1179en_US
dc.internal.reviewer-noteNot OA AAM can be used with 6 month embargo ACH 8.3.18en
pubs.organisational-group/Natural History Museum
pubs.organisational-group/Natural History Museum/Science Group
pubs.organisational-group/Natural History Museum/Science Group/Earth Sciences
pubs.organisational-group/Natural History Museum/Science Group/Earth Sciences/Invertebrates and Plants Palaeobiology
pubs.organisational-group/Natural History Museum/Science Group/Functional groups
pubs.organisational-group/Natural History Museum/Science Group/Functional groups/Collections
dc.embargoNot knownen_US
elements.import.authorEvans, Den_US
elements.import.authorSagoo, Nen_US
elements.import.authorRenema, Wen_US
elements.import.authorCotton, LJen_US
elements.import.authorMüller, Wen_US
elements.import.authorTodd, JAen_US
elements.import.authorSaraswati, PKen_US
elements.import.authorStassen, Pen_US
elements.import.authorZiegler, Men_US
elements.import.authorPearson, PNen_US
elements.import.authorValdes, PJen_US
elements.import.authorAffek, HPen_US
dc.description.nhm© 2018 Published under the PNAS license. The attached document is the authors’ final accepted/submitted version of the journal article. You are advised to consult the publisher’s version if you wish to cite from it.en_US
dc.subject.nhmclumped isotopeen_US
dc.subject.nhmEoceneen_US
dc.subject.nhmtropical sea-surface temperaturesen_US
dc.subject.nhmpolar amplificationen_US
dc.subject.nhmseawater Mg/Caen_US
refterms.dateFOA2018-07-22T00:00:00Z


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