Simulating aerosol nucleation bursts in a coniferous forest

We modified a numerical model of atmospheric aerosol nucleation bursts to include the dry deposition of ions and freshly nucleated particles onto tree needles in a coniferous forest. The dry deposition is estimated using the Churchill-Bernstein approximation, which is adapted from the theory of heat transfer. The model includes an improved submodel of the sink of ions and nucleation mode particles onto large particles of the background aerosol. The user can edit the values of 95 input parameters by altering a control file. The computing time on an ordinary PC is counted in seconds in case of a typical task, which is characterized by several thousands of time steps and several thousands of size sections. The numerical examples show that, during atmospheric aerosol nucleation events, the dry deposition of ions and nanometer scale particles onto the conifer needles has a considerable effect on the respective concentrations.