13C/12C fractionation during CO2 transfer from air to sea

Siegenthaler, U.; Münnich, K.O. (1981). 13C/12C fractionation during CO2 transfer from air to sea. In: Bolin, Bert (ed.) Carbon Cycle Modelling. SCOPE: Vol. 16 (pp. 249-257). John Wiley

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Isotopic fractionation factors for the CO2 transfer between atmosphere and ocean are calculated, taking into account equilibrium and kinetic fractionation. Diffusion of CO2 into the water, which is rate limiting for mean oceanic conditions, fractionates the carbon isotopes only little. I3C/I2C fractionations are found to be -1.8 to - 2.3‰ for atmosphere-to-ocean transfer, and -9.7 to -10.2‰ for ocean-to-atmosphere transfer.
A different case is absorption by alkaline solutions which is controlled simultaneously by CO2 diffusion and the reaction between CO2 and OH-. The reaction rate exhibits a fractionation for I3C/I2C of about -27‰.

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