Papers Online - #158

A Simulation of an Extreme Katabatic Wind Event

by
  • Hubert Gallee and Olivier Brasseur
    Laboratorie d'etude des Transferts en Hydrologie et Environnement
    Grenoble, France

    and

    Gerd Wendler
    Geophysical Institute
    University of Alaska, Fairbanks
    Alaska, USA

    Abstract

    The polar limited area model MAR is used to assess the ability of a mesoscale model to simulate extreme katabatic wind events, in order to forecast them over the Antarctic ice sheet. MAR simulates the event of 23 February 2001 at Cape Denison, even when using a coarse horizontal resolution of 55 km. Nevertheless the maximum wind speed is underestimated. Sensitivity experiments to the representation of turbulence above the SL confirm the relatively good performances of the E-e scheme proposed by Duynkerke (1998). It is confirmed that the blowing snow process is responsible for an increase of the wind speed. An increase of the horizontal resolution slightly improves the simulation.

     

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    Gerd Wendler
    gerd@gi.alaska.edu
    Date Last Modified: 4/30/00