Earth System Dynamics
Earth System Dynamics
ESD
Articles | Volume 15, issue 3
Articles | Volume 15, issue 3
https://doi.org/10.5194/esd-15-565-2024
© Author(s) 2024. This work is distributed under
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/esd-15-565-2024
© Author(s) 2024. This work is distributed under
the Creative Commons Attribution 4.0 License.
Articles | Volume 15, issue 3
Research article
 | 
03 May 2024
Research article |  | 03 May 2024

The carbonate pump feedback on alkalinity and the carbon cycle in the 21st century and beyond

Alban Planchat, Laurent Bopp, Lester Kwiatkowski, and Olivier Torres

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Latest update: 25 Oct 2025
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Short summary
Ocean acidification is likely to impact all stages of the ocean carbonate pump. We show divergent responses of CaCO3 export throughout this century in earth system models, with anomalies by 2100 ranging from −74 % to +23 % under a high-emission scenario. While we confirm the limited impact of carbonate pump anomalies on 21st century ocean carbon uptake and acidification, we highlight a potentially abrupt shift in CaCO3 dissolution from deep to subsurface waters beyond 2100.
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