Report on pre-operational trials of the new microphysics scheme in the mesoscale model
Radcliffe, B. ; CHALCRAFT, B. ; Wilson [D.] ; MACPHERSON, B. ; WILSON, C. ; Clark, P.
Editeur
MET. OFFICE
Année de publication
1998
Pre-operational trials of a new cloud microphysics scheme and new visibility diagnostic, have been shown to have a strong beneficial effect on mesoscale model forecasts. The new microphysics scheme uses more physical arguments in its treatment of water types, with ice becoming a prognostic variable. The new visibility diagnostic is now based on the assumption of a distribution of relative humidity within the grid-box. After a series of case studies and a parallel trial, biggest forecast improvements have been seen in fog probabilities, visibility and screen temperature.
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