Bin Diffusion Model is a bin microphysics parcel model to solve for the condensational growth of liquid aerosol particles into cloud droplets. It also calculates the homogeneous nucleation of water ice in both aqueous solution droplets and cloud drops. The model treats each liquid size bin in a novel way, treating the diffusion of water through each liquid droplet. It can therefore answer questions about the importance of ultra viscous aerosol on cloud formation processes. This version of the code enables the calculation of homogeneous nucleation of a distribution of aerosol particles with each bin, solving a separate radially symmetric Fickian diffusion equation. Diffusion coefficients can either be constant or can be calculated according to published values that depend on water mole fraction. Output is to a NetCDF file, which must be read and plotted with the user's own program (see GitHub wiki page for an example). See Fowler et al (2019) for details: https://doi.org/10.5194/acp-2019-401

Natural Environment Research Council (NERC) EAO Doctoral Training Partnership under grant reference number NE/L002469/1 Natural Environment Research Council (NERC) "The effects of organic material on warm and cold cloud formation: from the laboratory to regional and global impacts" under grant reference number NE/L007827/1