Hinrichs et al. (2023): Alkalinity biases in CMIP6 Earth system models and implications for simulated CO2 drawdown via artificial alkalinity enhancement

Claudia Hinrichs, Peter Köhler, Christoph Völker, Judith Hauck IN: Biogeosciences, 20, 3717–3735, https://doi.org/10.5194/bg-20-3717-2023

For the application of the models to assess the potential of ocean alkalinity enhancement (OAE) to increase ocean carbon uptake, a back-of-the-envelope calculation was conducted with each model’s global mean surface alkalinity, DIC, and partial pressure of CO2 in seawater (pCO2) as input parameters. The authors evaluate the following two metrics: (1) the initial pCO2 reduction at the surface ocean after alkalinity addition and (2) the uptake efficiency (ηCO2) after air–sea equilibration is reached.