Abstract
Parameterizations of gas transfer velocities are needed for climate
predictions. Single parameter models typically only include wind
dependence and may readily be used in climate studies. Their application
is however gas specific and limited to select environments. Mechanistic
parameterizations incorporating multiple forcing factors allow modelling
the transfer of gases with differing solubilities for a wide range of
conditions. A novel framework is put forward to model gas transfer in
the open ocean in the presence of breaking waves. It incorporates both
the turbulence- and bubble-mediated transfers based on statistics
determined from the breaking crest length distribution
($\Lambda(c)$). Testing the mechanistic model with
measurements from the HiWinGS field campaign shows promising results for
both CO\textsubscript{2} and DMS. Uncertainties remain
in the quantification of bubble clouds which are at the core of the
formulation of the bubble-mediated transfer.