Biogeosciences
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Articles | Volume 22, issue 12
Articles | Volume 22, issue 12
https://doi.org/10.5194/bg-22-2979-2025
© Author(s) 2025. This work is distributed under
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/bg-22-2979-2025
© Author(s) 2025. This work is distributed under
the Creative Commons Attribution 4.0 License.
Articles | Volume 22, issue 12
Research article
 | 
26 Jun 2025
Research article |  | 26 Jun 2025

Three-compartment, two-parameter concentration-driven model for uptake of excess atmospheric CO2 by the global ocean

Stephen E. Schwartz

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Latest update: 23 Sep 2026
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Short summary
The net uptake coefficient of anthropogenic CO2 by the global ocean (net uptake flux divided by excess atmospheric CO2 stock above preindustrial levels) calculated with a simple, transparent, three-compartment concentration-driven model with two independent parameters is determined to be 0.010 ± 0.002 yr-1 (with a net uptake flux in the year 2022 of 2.84 ± 0.6 Pg yr-1). This result compares well with observations and with much more complex carbon cycle models.
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