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Developed by NCAS-MAN, PyACPIM is a cloud parcel model including detailed, binned cloud microphysics. It is based on the underlying science of the Aerosol‐Cloud‐Precipitation‐Interactions Model, (Connolly et al, 2012). PyACPIM has been specifically designed to aid the understanding of experiments conducted in cloud chambers. The model comes with a graphical user interface which allows easy of use of the model. Temperature and pressure profiles during model simulations can be fit to those observed during chamber experiments, allowing for as accurate as possible representation of specific chamber experiments. As
inputs the model takes any number of lognormal aerosol size distributions, of any composition (internally and/or internally mixed), initial relative humidity, temperature and pressure. The activation of aerosol particles into cloud drops follows κ‐koehler theory (Petters and Kreidenweis, 2007). Ice nucleation follows the ice‐active‐surface‐site‐density parameterisations, (Niemand et al 2012). The model outputs time series of cloud droplet, and ice crystal, number concentration as well as cloud liquid, and ice, water contents. Time series of temperature, pressure and relative humidity are also outputted. Initial comparison between model results and chamber observations under warm cloud conditions for two different aerosol types show very good agreement.
The software can be downloaded through this link https://data.eurochamp.org/modelling-tools.