Theoretical model of the Bergeron-Findeisen mechanism of ice crystal growth in clouds

N. E. Castellano, E. E. Avila, C. P R Saunders

    Research output: Contribution to journalArticlepeer-review

    Abstract

    A numerical study of growth rate of ice particles in an array of water droplets (Bergeron-Findeisen mechanism) has used the method of electrostatic image charges to determine the vapour field in which a particle grows. Analysis of growth rate in various conditions of relevance to clouds has shown that it is proportional to liquid water content and to ice particle size, while it is inversely proportional to cloud droplet size. The results show that growth rate is enhanced by several percent relative to the usual treatment in which vapour is assumed to diffuse from infinity towards a growing ice particle. The study was performed for ice particles between 25 and 150 μm radii, water droplet sizes between 6 and 20 μm diameter and a wide range of liquid water contents. A study was also made to determine the effect of reducing the vapour source at infinity so that the droplets alone provided the vapour for particle growth. A parameterisation of ice particle growth rate is given as a function of liquid water content and ice particle and droplet sizes. These studies are of importance to considerations in thunderstorm electrification processes, where the mechanism of charge transfer between ice particles and graupel could take place. © 2004 Elsevier Ltd. All rights reserved.
    Original languageEnglish
    Pages (from-to)6751-6761
    Number of pages10
    JournalAtmospheric Environment
    Volume38
    Issue number39
    DOIs
    Publication statusPublished - Dec 2004

    Keywords

    • Bergeron-Findeisen process
    • Ice particle growth
    • Image charges
    • Mixed-phase cloud
    • Vapour diffusion

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