Climate of the Past
Climate of the Past
CP
Articles | Volume 12, issue 4
Articles | Volume 12, issue 4
https://doi.org/10.5194/cp-12-819-2016
© Author(s) 2016. This work is distributed under
the Creative Commons Attribution 3.0 License.
Special issue:
https://doi.org/10.5194/cp-12-819-2016
© Author(s) 2016. This work is distributed under
the Creative Commons Attribution 3.0 License.
Articles | Volume 12, issue 4
Research article
 | 
06 Apr 2016
Research article |  | 06 Apr 2016

Revisiting carbonate chemistry controls on planktic foraminifera Mg /  Ca: implications for sea surface temperature and hydrology shifts over the Paleocene–Eocene Thermal Maximum and Eocene–Oligocene transition

David Evans, Bridget S. Wade, Michael Henehan, Jonathan Erez, and Wolfgang Müller

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Short summary
We show that seawater pH exerts a substantial control on planktic foraminifera Mg / Ca, a widely applied palaeothermometer. As a result, temperature reconstructions based on this proxy are likely inaccurate over climatic events associated with a significant change in pH. We examine the implications of our findings for hydrological and temperature shifts over the Paleocene-Eocene Thermal Maximum and for the degree of surface ocean precursor cooling before the Eocene-Oligocene transition.
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Special issue
Climatic and biotic events of the Paleogene