Microphysics of clouds: Model vs measurements

A. Hallberg, W. Wobrock, A. I. Flossmann, K. N. Bower, K. J. Noone, A. Wiedensohler, H. C. Hansson, M. Wendisch, A. Berner, C. Kruisz, P. Laj, M. C. Facchini, S. Fuzzi, B. G. Arends

    Research output: Contribution to journalArticlepeer-review

    Abstract

    In order to study the relation between the initial aerosol particle spectrum at cloud base and the resulting droplet spectrum in cloud for the 'Ground-based Cloud Experiment' field campaign at the Great Dun Fell in 1993 numerical model simulations have been performed. The droplet spectra were calculated from a microphysical model coupled to a dynamic air flow model. The resulting droplet spectra were compared with cloud droplet spectra measured with a forward scattering spectrometer probe. The size distribution and chemical composition of the initial aerosol population were derived from a combination of size distribution and size-segregated chemical measurements below cloud base. From this we concluded that the aerosol particles consisted almost entirely of an inorganic salt. As part of the sensitivity studies two different microphysical models were used, as well as the dynamic flow fields from two different air flow models. As in previous studies we found that the measured droplet spectra were broader and contained larger drops than the modelled spectra. From the sensitivity studies we identified fluctuations in the dynamics as the most likely explanation for these differences.
    Original languageEnglish
    Pages (from-to)2453-2462
    Number of pages9
    JournalAtmospheric Environment
    Volume31
    Issue number16
    DOIs
    Publication statusPublished - Aug 1997

    Keywords

    • Aerosol particles
    • CCN
    • Cloud chemistry
    • Cloud physics
    • Fog

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