General chemical reaction simulation applied to below-cloud scavenging

Reactive below-cloud scavenging is simulated using general chemical reaction simulation. Modelling of mass transfer is mathematically equivalent to modelling of chemical reactions. The computer model is flexible as regards input of chemical reactions and transport of species, which means that changes in the zomponents, reactions, and transport of species can be made without reprogramming. The numbers of species, reactions, and compartments between which mass transfer takes place may be large and they are only limited by computing time and memory capacity. The set-up of the matrix equation necessary for general simulation of chemical reactions and transport of species is applied for scavenging of a NH3 plume.