Invasion of Fossil Fuel CO2 into the Ocean

Uptake of fossil fuel CO₂ by the ocean is calculated using one-dimensional box-diffusion-type ocean models and two-dimensional isopycnal ventilation-type models. The total uptake of CO₂ using the individual box-diffusion model calibrated for different regions of the ocean is essentially the same as that predicted by the original Oeschger global box-diffusion model. A modified box-diffusion model with deep-water formation, upwelling, nutrient cycling, and two separate vertical-mixing rates predicts an uptake about 25% higher. The temperate thermocline model of the North Atlantic indicates that the two-dimensional isopycnal ventilation model may not necessarily take up more excess CO₂ than the one-dimensional vertical-mixing-type model.