Box models such as Geocarbsulf (2006) indicate that the mass of O2 has changed over geological time and Johnson & Goldblatt note in their EarthN model that N2 has also not been constant; thus Patm has probably varied together with pCO2.
At the ocean interface there is a fractionation of 13C which has been actively examined at different temperatures and values are higher, for example, in colder waters. It seems likely that the very high Henry's Constant for CO@ would alos facilitate higher 13C values at higher Patm. I could not find, however, any experimental (or theoretical) work on this
Regards
Alan
There were a couple of typos in the question, a cleaner version follows:
"Box models such as Geocarbsulf (2006) indicate that the mass of O2 has changed over geological time and Johnson & Goldblatt note in their EarthN model that N2 has also not been constant; thus Patm has probably varied over time as has pCO2.
At the ocean interface there is a fractionation of 13C which has been actively examined at different temperatures and values are higher, for example, in colder waters. At higher Patm (i.e. higher energy) the stronger 13C bonds may be more easily overcome allowing for higher 13C values. I could not find, however, any experimental (or theoretical) work on this.
Best
Alan
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