Ocean Science
Ocean Science
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Articles | Volume 22, issue 3
Articles | Volume 22, issue 3
https://doi.org/10.5194/os-22-1529-2026
© Author(s) 2026. This work is distributed under
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/os-22-1529-2026
© Author(s) 2026. This work is distributed under
the Creative Commons Attribution 4.0 License.
Articles | Volume 22, issue 3
Research article
 | 
18 May 2026
Research article |  | 18 May 2026

Cuban coral traces annual hydrologically driven variability in δ234U values since the end of the Little Ice Age

Sahra Greve, Norbert Frank, Paolo Montagna, Carlos Manuel Alonso-Hernández, Miguel Gomez-Batista, Eric Douville, and Sophie Warken

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Short summary
We studied uranium isotopes in a 237-year-old coral from Cuba to understand how freshwater influences the ocean. The coral’s mostly stable uranium values vary with regional rainfall. During the late 1700s, variability increased sharply, revealing stronger distant river uranium input or changes in local terrestrial uranium sources. These findings show that corals Uranium ratios record past climate and ocean changes with high precision.
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