Biogeosciences
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Articles | Volume 23, issue 9
Articles | Volume 23, issue 9
https://doi.org/10.5194/bg-23-3279-2026
© Author(s) 2026. This work is distributed under
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/bg-23-3279-2026
© Author(s) 2026. This work is distributed under
the Creative Commons Attribution 4.0 License.
Articles | Volume 23, issue 9
Research article
 | 
12 May 2026
Research article |  | 12 May 2026

Subsurface dissolution reduces the efficiency of mineral-based open-ocean alkalinity enhancement

Friedrich A. Burger, Urs Hofmann Elizondo, Hendrik Grosselindemann, and Thomas L. Frölicher

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Short summary

Ocean alkalinity enhancement is viewed as a promising option for carbon dioxide removal. When alkalinity is added in the open ocean through mineral powders, carbon uptake from the atmosphere is decreased when mineral particles sink before fully dissolving. Here we prescribe vertical alkalinity release profiles to an Earth system model. We show that carbon uptake may initially decrease by more than 75% when grain size doubles and that full uptake is delayed by centuries and spatially dispersed.

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