| The Canadian Land Surface Scheme (CLASS) is a typical land surface model representing sub-surface and boundary layer moisture, energy and momentum exchanges via surface energy balance and turbulent flux formulae. With the solution of precision related problems, minor structural changes and code modifications, CLASS, built for a 64-bit UNIX computing environment was successfully converted for use in a 32-bit Lahey FORTRAN computing environment.; Results indicate that blowing snow sublimation from grass canopies has little impact on snow depths and that significant vegetation exposure slows the blowing snow sublimation rate from the underlying ground. Hence, the presence of tall grass can result in significant reductions in the blowing snow sublimation rate, even when the 10 m wind speed and atmospheric moisture content are favourable. Indications are that a high frequency of low wind speeds near and within tall tree crowns, limit blowing snow sublimation from such surfaces to a few periodic events. (Abstract shortened by UMI.)... |
