[CF-metadata] standard name proposal for CCMVal

[Jonathan Gregory]

Dear Martin

> Concerning the passivity of passive ozone, I believe that it is absolute. I.e. 
> it has no feedbacks on the model evolution. If we start listing the feedbacks 
> which it doesn't have we need to anticipate all feedbacks for true ozone that 
> might be incorporated into the models in the future. Isn't it simpler to say 
> that there are none?

> Chemically_passive would be wrong, as it is also radiatively passive.

Ah. Obviously that didn't occur to me or Alison, and my feeling is that 
indicates "passive" to be an uninformative term. In what respect is it "ozone"?

Cheers

Jonathan