Such agreement is essential for accurately understanding and monitoring marine carbon cycling, including air-sea fluxes of CO₂, uptake and storage of anthropogenic carbon, ocean acidification, and marine carbon dioxide removal (mCDR) technologies. These important topics are strongly aligned with OCB research priorities on changing ocean chemistry, ocean carbon fluxes and sequestration, and carbon cycling. OCSIF was a very successful working group: throughout the working group, small teams of OCSIF members published papers focused on issues related to internal consistency, and the full team worked collectively on two summary papers submitted under the banner of OCSIF at the conclusion of the working group (Carter et al. 2024a,b). These papers provide robust assessments of the internal consistency of the seawater carbonate system parameters, field-wide estimates of uncertainties, and recommendations for further research. The proposed OCB subcommittee would build on those recommendations by advancing research, fostering collaborations (including encouraging and supporting early-career researchers), promoting rotation of membership, and identifying additional knowledge gaps as progress is made and new scientific questions arise.