HR: 1330h
AN: A53A-09    [Abstracts]
TI: The Simulation of a Hailstorm Using a Multi-Moment Bulk Microphysics Scheme
AU: * Milbrandt, J A
EM: jason.milbrandt@mcgill.ca
AF: McGill University Department of Atmospheric and Oceanic Sciences, 805 Sherbrooke Street West, Montreal, QC H3A 2K6 Canada
AU: * Milbrandt, J A
EM: jason.milbrandt@mcgill.ca
AF: Meteorological Services of Canada, 2121 Trans-Canada Highway, Dorval, QC H9P 1J3 Canada
AU: Yau, M
EM: peter.yau@mcgill.ca
AF: McGill University Department of Atmospheric and Oceanic Sciences, 805 Sherbrooke Street West, Montreal, QC H3A 2K6 Canada
AB: A multi-moment bulk microphysics scheme has been designed and interfaced with the Canadian MC2 mesoscale model and applied to conduct high-resolution simulations of a hailstorm. Comparisons are made between the control simulation, which used the full three-moment version of the new scheme, and sensitivity runs with various one-moment and two-moment versions. We examine how the different approaches affected the simulated storm structure, hail sizes, and quantity and phase of the precipitation at the surface. It will be shown that there is a fundamental improvement in the overall simulation skill for multi-moment over one-moment schemes. Further, the versions which allow the relative dispersion parameter to vary, either prognostically or diagnostically, are able to control the problems associated with excessive size-sorting due to differential sedimentation that are inherent in standard fixed-dispersion two-moment schemes.
DE: 0320 Cloud physics and chemistry
DE: 3329 Mesoscale meteorology
DE: 3354 Precipitation (1854)
SC: Atmospheric Sciences [A]
MN: 2005 Joint Assembly