On Aug 16, 9:30*pm, Alastair wrote:

I think the reason that the two scales are used is that for CO2
dissolved in the ocean ppmv would not make sense.

A litre of the gas at stp will dissolve in a litre of water. (Or is it
the other way around?)

Considering the amount of superheated carbonate and the underlying
carbon rich strata oil companies drill through it to, it doesn't make
any sense at all.