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.
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.
the Creative Commons Attribution 4.0 License.
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
CORRESPONDING AUTHOR
GEOMAR Helmholtz Centre for Ocean Research, Kiel, 24148, Germany
School of Earth and Environmental Sciences, University of St Andrews, St Andrews, KY16 9TS, United Kingdom
Ed Hathorne
GEOMAR Helmholtz Centre for Ocean Research, Kiel, 24148, Germany
Xuefei Chen
State Key Laboratory of Isotope Geochemistry, Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, Guangzhou, 510640, China
Gangjian Wei
State Key Laboratory of Isotope Geochemistry, Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, Guangzhou, 510640, China
Florian Böhm
GEOMAR Helmholtz Centre for Ocean Research, Kiel, 24148, Germany
Alexander Heuser
GEOMAR Helmholtz Centre for Ocean Research, Kiel, 24148, Germany
Anton Eisenhauer
GEOMAR Helmholtz Centre for Ocean Research, Kiel, 24148, Germany
Christopher Siebert
GEOMAR Helmholtz Centre for Ocean Research, Kiel, 24148, Germany
Martin Frank
GEOMAR Helmholtz Centre for Ocean Research, Kiel, 24148, Germany
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Revised manuscript accepted for ESSD
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The Mediterranean Sea turned repeatedly into an oxygen-deprived basin during the geological past, as evidenced by distinct sediment layers called sapropels. We use here records of the last sapropel S1 retrieved in front of the Nile River to explore the relationships between riverine input and seawater oxygenation. We decipher the seasonal cycle of fluvial input and seawater chemistry as well as the decisive influence of primary productivity on deoxygenation at millennial timescales.
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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.
Reef-building corals create their skeletons in two steps: first by adjusting their internal...
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