Biogeosciences
Biogeosciences
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Articles | Volume 22, issue 20
Articles | Volume 22, issue 20
https://doi.org/10.5194/bg-22-5897-2025
© Author(s) 2025. This work is distributed under
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/bg-22-5897-2025
© Author(s) 2025. This work is distributed under
the Creative Commons Attribution 4.0 License.
Articles | Volume 22, issue 20
Research article
 | 
22 Oct 2025
Research article |  | 22 Oct 2025

Interactions between ocean alkalinity enhancement and phytoplankton in an Earth system model

Miriam Seifert, Christopher Danek, Christoph Völker, and Judith Hauck

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Short summary
Ocean alkalinity enhancement (OAE) can help to remove CO2 from the atmosphere. Yet, our study is the first to investigate the link between OAE and phytoplankton in an Earth system model. We show that OAE can indirectly decrease primary production and that biological feedbacks can modify the efficiency of OAE. Our study provides hints for ecological risks of OAE and the quantification of carbon drawdown and can serve as a kick start for other models to consider OAE–ecosystem interactions.
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