Climate of the Past
Climate of the Past
CP
Articles | Volume 22, issue 2
Articles | Volume 22, issue 2
https://doi.org/10.5194/cp-22-247-2026
© Author(s) 2026. This work is distributed under
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/cp-22-247-2026
© Author(s) 2026. This work is distributed under
the Creative Commons Attribution 4.0 License.
Articles | Volume 22, issue 2
Research article
 | 
05 Feb 2026
Research article |  | 05 Feb 2026

Past Ocean surface density from planktonic foraminifera calcite δ18O

Thibaut Caley, Niclas Rieger, Martin Werner, Claire Waelbroeck, Héloise Barathieu, Tamara Happé, and Didier M. Roche

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Short summary
Density of seawater is a critical property that controls ocean dynamics. We developed the use of the δ18Oc of planktonic foraminifera as a surface paleodensity proxy for the ocean using Bayesian regression models calibrated to mean annual surface density. We reconstructed annual surface density during the last glacial maximum and late Holocene time periods. These results will be used to evaluate numerical climate models in their ability to simulate past ocean surface density.
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