A one-dimensional numerical model to simulate liquid phase chemical reactions within radiation fog

A one-dimensional numerical model of the atmospheric boundary layer is coupled with a bulk phase aqueous chemistry model to calculate sulfate production, ionic balance, and pH-values during radiation fog events. The model can be used to investigate the influence of the initial aerosol composition and trace gas concentrations on sulfate production within the fog water. The calculated pH within the fog is between 3 and 4 in most cases of mature fog with much lower values during the initial and the dissipation stage. The turbulent transport of oxidants can have an influence on the production of sulfate within a fog layer. A considerable amount of aerosol material is removed by droplet sedimentation during episodes of radiation fog.