Carbon Dioxide Fractionation at Air-Ocean Interface

[Questioning_Climate]

Carbon Dioxide Fractionation at Air-Ocean Interface:
The ratio of 13C/12C is altered during CO2 transfer from air to sea and vice versa. Importantly, this is dynamic and the effect is much larger going from ocean to atmosphere. Since the oceans are assumed to cycle CO2 with a half-life of less than a decade, this effect is very significant. This should lead to serious questioning of the premise that 13C/12C ratio changes in atmospheric CO2 are of anthropogenic origin, i.e. burning hydrocarbons.

http://data.ieda.org.cn/upload/fckeditor...281%29.pdf

Quote:ABSTRACT
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. 13C/12C fractionations are found to be -1.8 to - 2.3 per mil for atmosphere-to-ocean transfer, and -9.7 to -10.2 per mil 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 13C/12C of about -27 per mil.