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Articles | Volume 22, issue 1
Articles | Volume 22, issue 1
https://doi.org/10.5194/bg-22-341-2025
© Author(s) 2025. This work is distributed under
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/bg-22-341-2025
© Author(s) 2025. This work is distributed under
the Creative Commons Attribution 4.0 License.
Articles | Volume 22, issue 1
Research article
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16 Jan 2025
Research article | Highlight paper |  | 16 Jan 2025

Efficiency metrics for ocean alkalinity enhancements under responsive and prescribed atmospheric pCO2 conditions

Michael D. Tyka

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Editorial statement
Assessing the efficiency and durability of marine carbon dioxide removal (CDR) requires the development of clear measurement, reporting, and verification protocols. In this contribution, Michael Tyke presents a path forward into the robust quantification of marine CDR, presenting and explaining how different metrics can be used, providing new tools for modellers, observationalists, and policymakers.
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Short summary
Marine CO2 removal (mCDR) is a promising technology for removing legacy emissions from the atmosphere. Its indirect nature makes it difficult to assess experimentally; instead one relies heavily on simulation. Many past papers have treated the atmosphere as non-responsive to the intervention studied. We show that even under these simplified assumptions, the increase in ocean CO2 inventory is equal to the equivalent quantity of direct CO2 removals occurring over time, in a realistic atmosphere.
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