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Articles | Volume 22, issue 3
Articles | Volume 22, issue 3
https://doi.org/10.5194/bg-22-791-2025
© Author(s) 2025. This work is distributed under
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/bg-22-791-2025
© Author(s) 2025. This work is distributed under
the Creative Commons Attribution 4.0 License.
Articles | Volume 22, issue 3
Research article
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12 Feb 2025
Research article | Highlight paper |  | 12 Feb 2025

What controls planktic foraminiferal calcification?

Ruby Barrett, Joost de Vries, and Daniela N. Schmidt

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Latest update: 22 Oct 2025
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This study reveals that size-normalized weight (SNW) in planktonic foraminifera varies by species and environment, making it unsuitable as a universal pCO2 proxy. Regional calibration and species-specific approaches are essential for reliable paleoceanographic reconstructions.
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Planktic foraminifers are a plankton whose fossilised shell weight is used to reconstruct past environmental conditions such as seawater CO2. However, there is debate about whether other environmental drivers impact shell weight. Here we use a global data compilation and statistics to analyse what controls their weight. We find that the response varies between species and ocean basin, making it important to use regional calibrations and consider which species should be used to reconstruct CO2.

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