Scavenging trace gases from an arbitrary dynamical source in the below-cloud layer of the atmosphere

We consider the scavenging of trace gases in the below-cloud layer with their evaporation from droplets and atmospheric turbulent diffusion. This problem is solved by the method of splitting into physical processes where the dynamics of scavenging of trace gases is treated separately on the background of atmospheric diffusion and transport. These processes produce a dynamical background source of trace gases. We obtain a general solution of kinetic equations of scavenging for a source with an arbitrary background distribution. This solution is analyzed for two limiting cases: slow and fast time-varying sources (compared to the process of scavenging). The results of illustrative calculations are presented and practical recommendations are given on the calculation of the scavenging rate for numerical systems.