Biogeosciences
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Articles | Volume 23, issue 15
Articles | Volume 23, issue 15
https://doi.org/10.5194/bg-23-5477-2026
© Author(s) 2026. This work is distributed under
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/bg-23-5477-2026
© Author(s) 2026. This work is distributed under
the Creative Commons Attribution 4.0 License.
Articles | Volume 23, issue 15
Research article
 | 
10 Aug 2026
Research article |  | 10 Aug 2026

Planktonic foraminifera iodine ∕ calcium ratio: is it a proxy for dissolved oxygen in the ocean?

Vincent Guarinos, Kazuyo Tachikawa, Marta Garcia, Giuseppe Siani, Marie Revel, Hartmut Schulz, Francisco Sierro, and Thomas Chalk

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Short summary
Direct observations indicate a decline in ocean oxygen concentration. The complexity of surface oxygen variability is linked to physical and biochemical parameters. To investigate past oxygen variability, foraminiferal I/Ca proxy must be calibrated. Here, we determine the drivers of the proxy using a database of modern samples. From our results, oxygen is the principal driver of the I/Ca proxy. We highlight its complex behaviour, while reinforcing its use for palaeoceanographic reconstructions.
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