Biogeosciences
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Articles | Volume 22, issue 18
Articles | Volume 22, issue 18
https://doi.org/10.5194/bg-22-5103-2025
© Author(s) 2025. This work is distributed under
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/bg-22-5103-2025
© Author(s) 2025. This work is distributed under
the Creative Commons Attribution 4.0 License.
Articles | Volume 22, issue 18
Research article
 | 
29 Sep 2025
Research article |  | 29 Sep 2025

From small-scale variability to mesoscale stability in surface ocean pH: implications for air–sea CO2 equilibration

Louise Delaigue, Gert-Jan Reichart, Li Qiu, Eric P. Achterberg, Yasmina Ourradi, Chris Galley, André Mutzberg, and Matthew P. Humphreys

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Short summary
Our study analysed pH in ocean surface waters to understand how it fluctuates with changes in temperature, salinity, and biological activities. We found that temperature mainly controls daily pH variations, but biological processes also play a role, especially in affecting CO2 levels between the ocean and atmosphere. Our research shows how these factors together maintain the balance of ocean chemistry, which is crucial for predicting changes in marine environments.
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