In a horizontally isothermal atmosphere for an arbitrary unknown condensation rate S the continuity equation has the form (see (A7) on p. 1053 in the paper) (judithcurry.com)
The Venus surface would not be hot if there were a propensity for isothermal conditions in a gravitational field, as Roy Spencer claimed. (judithcurry.com)
But this is a separate story beyond the horizontally isothermal case considered in the paper.) (judithcurry.com)