Skip to content

Research at St Andrews

Eocene greenhouse climate revealed by coupled clumped isotope-Mg/Ca thermometry

Research output: Research - peer-reviewArticle

DOI

Author(s)

David Evans, Navjit Sagoo, Willem Renema, Laura J. Cotton, Wolfgang Müller, Jonathan A. Todd, Pratul Kumar Saraswati, Peter Stassen, Martin Ziegler, Paul N. Pearson, Paul J. Valdes, Hagit P. Affek

School/Research organisations

Abstract

Past 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.
Close

Details

Original languageEnglish
Pages (from-to)1174-1179
Number of pages6
JournalProceedings of the National Academy of Sciences of the United States of America
Volume115
Issue number6
Early online date22 Jan 2018
DOIs
StatePublished - Feb 2018

    Research areas

  • Clumped isotope , Eocene, Tropical sea-surface temperatures, Polar amplification, Seawater Mg/Ca

Discover related content
Find related publications, people, projects and more using interactive charts.

View graph of relations

Related by author

  1. Calibration of Na partitioning in the calcitic foraminifer Operculina ammonoides under variable Ca concentration: toward reconstructing past seawater composition

    Hauzer, H., Evans, D., Müller, W., Rosenthal, Y. & Erez, J. 20 Jun 2018 In : Earth and Planetary Science Letters. 497, p. 80-91 12 p.

    Research output: Research - peer-reviewArticle

  2. The accuracy of mid-Pliocene δ18O-based ice volume and sea level reconstructions

    Raymo, M. E., Kozdon, R., Evans, D., Lisiecki, L. & Ford, H. L. Feb 2018 In : Earth Science Reviews. 177, p. 291-302

    Research output: Research - peer-reviewReview article

  3. The evolution of deep ocean chemistry and respired carbon in the Eastern Equatorial Pacific over the last deglaciation

    de la Fuente, M., Calvo, E., Skinner, L., Pelejero, C., Evans, D., Müller, W., Povea, P. & Cacho, I. Dec 2017 In : Paleoceanography and Paleoclimatology. 32, 12, p. 1371-1385 15 p.

    Research output: Research - peer-reviewArticle

Related by journal

  1. Periplasmic depolymerase provides insight into ABC transporter-dependent secretion of bacterial capsular polysaccharides

    Liston, S. D., McMahon, S. A., Le Bas, A., Suits, M. D. L., Naismith, J. H. & Whitfield, C. 22 May 2018 In : Proceedings of the National Academy of Sciences of the United States of America. 115, 21, p. E4870-E4879 10 p.

    Research output: Research - peer-reviewArticle

  2. Molecular mechanism of activation of human musk receptors OR5AN1 and OR1A1 by (R)-muscone and diverse other musk-smelling compounds

    Ahmed, L., Zhang, Y., Block, E., Buehl, M., Corr, M. J., Cormanich, R. A., Gundala, S., Matsunami, H., O'Hagan, D., Ozbil, M., Pan, Y., Sekharan, S., Ten, N., Wang, M., Yang, M., Zhang, Q., Zhang, R., Batista, V. & Zhuang, H. 24 Apr 2018 In : Proceedings of the National Academy of Sciences of the United States of America. 115, 17, p. E3950-E3958 9 p.

    Research output: Research - peer-reviewReview article

  3. Divergent biodiversity change within ecosystems

    Magurran, A. E., Deacon, A. E., Moyes, F. H., Shimadzu, H., Azeredo de Dornelas, M. A., Phillip, D. & Ramnarine, I. 20 Feb 2018 In : Proceedings of the National Academy of Sciences of the United States of America. 115, 8, p. 1843-1847 5 p.

    Research output: Research - peer-reviewArticle

  4. Ancient polymorphisms and divergence hitchhiking contribute to genomic islands of divergence within a poplar species complex

    Ma, T., Wang, K., Hu, Q., Xi, Z., Wan, D., Wang, Q., Feng, J., Jiang, D., Ahani, H., Abbott, R. J., Lascoux, M., Nevo, E. & Liu, J. 9 Jan 2018 In : Proceedings of the National Academy of Sciences of the United States of America. 115, 2, p. E236-E243 8 p.

    Research output: Research - peer-reviewArticle

Related by journal

  1. Proceedings of the National Academy of Sciences of the United States of America (Journal)

    Nevels, M. M. (Guest editor)
    Jul 2016 → …

    Activity: Publication peer-review and editorial workEditor of research journal

  2. Proceedings of the National Academy of Sciences of the United States of America (Journal)

    Smith, T. K. (Member of editorial board)
    2012 → …

    Activity: Publication peer-review and editorial workPeer review of manuscripts

  3. Proceedings of the National Academy of Sciences of the United States of America (Journal)

    Smith, T. K. (Member of editorial board)
    2008 → …

    Activity: Publication peer-review and editorial workPeer review of manuscripts

  4. Proceedings of the National Academy of Sciences of the United States of America (Journal)

    Miles, G. B. (Reviewer)
    2006 → …

    Activity: Publication peer-review and editorial workPeer review of manuscripts

ID: 252121437