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Abstract. Transformation of the mass flux towards the particle from thekinetic regime to the continuum regime is often described by theFuchs–Sutugin coefficient. Kinetic regime can be obtained as a limiting casewhen only one term of the expansion of the Fuchs–Sutugin coefficient at small1∕Kn is considered. Here we take the two first terms into account,and get a mass flux which agrees well with the full mass flux down toKn∼0.5. This procedure allows an analyticalsolution of the condensation equation valid for the range of intermediateKnudsen numbers to be obtained. The expansion is further applied to analytically calculatethe condensation sink. The formula for the condensation sink is testedagainst field observations. The relative contribution of different aerosolmodes to the condensation sink is discussed. Furthermore, we present a simplemodel describing the coupled dynamics of the condensing vapour and thecondensation sink. The model gives reasonable predictions of condensationsink dynamics during the periods of the aerosol modes' growth by condensationin the atmosphere.

A simple model for the time evolution of the condensation sink in the atmosphere for intermediate Knudsen numbers