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

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ID: 107191
2018
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Ranked #165 of 292 articles by views in Proceedings of the National Academy of Sciences of the United States of America

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Abstract
Past greenhouse periods with elevated atmospheric CO 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 CO, the degree of tropical warming, and the resulting latitudinal SST gradient is not well known. Here, we present coupled clumped isotope (Δ)-Mg/Ca measurements of foraminifera from a set of globally distributed sites in the tropics and midlatitudes. Δ 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/Ca 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.
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evans2018eoceneproceedings Use this key to autocite in the manuscript while using SciMatic Manuscript Manager or Thesis Manager
Authors Evans, David;Sagoo, Navjit;Renema, Willem;Cotton, Laura J;Müller, Wolfgang;Todd, Jonathan A;Saraswati, Pratul Kumar;Stassen, Peter;Ziegler, Martin;Pearson, Paul N;Valdes, Paul J;Affek, Hagit P;
Journal Proceedings of the National Academy of Sciences of the United States of America
Year 2018
DOI
10.1073/pnas.1714744115
URL
Keywords
eocene clumped isotope polar amplification seawater mg/ca tropical sea-surface temperatures

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