The basic formulae that this phenomenon is derived from relies upon a 'conjunction' of both 'Charles's Law' and 'Boyle's Law' (P.V.T). However, this formula doesn't account for any changes for either the 'gasses involved', or any 'change in salinity' at the 'interface' between 'atmosphere/sea surface' in an 'open environment'. Thus, the formulation of 'P.Vnr.T' was employed to account for changes in the 'atmospheric mix' at the 'interface', but this doesn't account for the 'sea surface' change of 'salinity' that follows the 'evaporation of water' and the 'concentration of salts' there due to 'the evaporation process'.
If it helps, on the 'sea/lake' side of the 'interface'. As 'water' evaporates the 'interface' becomes more 'saline' on the 'water' side of the equation. Thus, its harder for water to 'evaporate' into the 'atmosphere'. Moreover, because the water in contact with the 'interface' is now more 'saline' than the 'water below' and is also 'heavier', 'Archimedes Principle' should be applied to 'this part' of the 'equation'. Its a 'headache'!
Kind regards, Ray Dart (AKA suricat).