Articles | Volume 12, issue 4
Clim. Past, 12, 819–835, 2016

Special issue: Climatic and biotic events of the Paleogene

Clim. Past, 12, 819–835, 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.


Interactive discussion

Status: closed
Status: closed
AC: Author comment | RC: Referee comment | SC: Short comment | EC: Editor comment
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Peer-review completion

AR: Author's response | RR: Referee report | ED: Editor decision
ED: Reconsider after major revisions (19 Oct 2015) by Appy Sluijs
AR by David Evans on behalf of the Authors (18 Jan 2016)  Author's response    Manuscript
ED: Referee Nomination & Report Request started (25 Jan 2016) by Appy Sluijs
RR by James C. Zachos (16 Feb 2016)
RR by Anonymous Referee #2 (11 Mar 2016)
ED: Publish subject to technical corrections (21 Mar 2016) by Appy Sluijs
AR by David Evans on behalf of the Authors (24 Mar 2016)  Author's response    Manuscript
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.