Abstract
The effects of surface films in reducing air-water exchange rates are discussed, an example being given to illustrate effects on solute concentrations and persistence. It is suggested that films may have two additive retarding effects. First is a hydrodynamic effect in which turbulence in the interfacial region is rendered more sluggish, this effect being identifiable by changes in drag coefficient, friction velocity, and surface roughness. Second is a diffusive resistance effect for which a three phase resistance model is derived. The effects are combined to give model results which compare favourably with experimental data. Suggestions are made for experimental testing of the model hypotheses.
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