Biogeosciences
Biogeosciences
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Articles | Volume 23, issue 9
Articles | Volume 23, issue 9
https://doi.org/10.5194/bg-23-3195-2026
© Author(s) 2026. This work is distributed under
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/bg-23-3195-2026
© Author(s) 2026. This work is distributed under
the Creative Commons Attribution 4.0 License.
Articles | Volume 23, issue 9
Research article
 | 
08 May 2026
Research article |  | 08 May 2026

Deconvolving the biogeochemical controls on coral Sr ∕ Ca and Ba ∕ Ca proxies: new perspectives from paired stable Ca, Sr and Ba isotope compositions

Yang Yu, Ed Hathorne, Xuefei Chen, Gangjian Wei, Florian Böhm, Alexander Heuser, Anton Eisenhauer, Christopher Siebert, and Martin Frank

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Short summary
Reef-building corals create their skeletons in two steps: first by adjusting their internal fluid chemistry, then by precipitating the solid mineral. Our results show that calcium and strontium uptake is actively regulated by corals and responds to sea surface temperature, while barium flows in passively. Understanding these patterns explains seasonal variations in coral geochemistry and improves the accuracy of using coral records to reconstruct past climate.
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