Articles | Volume 12, issue 4
Clim. Past, 12, 819–835, 2016
https://doi.org/10.5194/cp-12-819-2016

Special issue: Climatic and biotic events of the Paleogene

Clim. Past, 12, 819–835, 2016
https://doi.org/10.5194/cp-12-819-2016

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 et al.

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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.