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In this study we have provided simple analytical formulae to estimate thegrowth rate of a nucleation mode due to self-coagulation and the apparentgrowth rate due to coagulation scavenging by larger particles. Theseformulae were used on a set of simulations covering a wide range ofatmospheric conditions. The modal growth rates were determined from thesimulation results by summing the contribution of each process, bycalculating the increase rate in the count mean diameter of the mode and byfollowing the peak concentration of the mode. The results of these threemethods were compared with each other and the means used to estimate thegrowth rate due to self-coagulation and coagulation scavenging were found togive accurate values. We also investigated the role of charged particles andelectric interactions in the growth of a nucleation mode. Charged particleswere found to increase the growth rate due to both self-coagulation andcoagulation scavenging by a factor of ~1.5 to 2. In case of increasedcondensation onto charged particles, the total condensational growth rate ofa nucleation mode may increase significantly in the very early steps of thegrowth. The analytical formulae provided by this paper were designed toprovide the growth rates due to different processes from aerosol dynamicsimulations, but the same principles can be used to determine the growthrates from measurement data

Atmospheric new particle formation: real and apparent growth of neutral and charged particles