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ALADIN/HR: TESTING THE NEW SUB-GRID SCALE OROGRAPHY REPRESENTATION ON BURA CASES
Dunja Drvar
orcid.org/0000-0002-0194-7111
; Croatian Meteorological and Hydrological Service, Grič 3, 10000 Zagreb
Ivana Stiperski
; Croatian Meteorological and Hydrological Service, Grič 3, 10000 Zagreb
Martina Tudor
; Croatian Meteorological and Hydrological Service, Grič 3, 10000 Zagreb
Vlasta Tutiš
; Croatian Meteorological and Hydrological Service, Grič 3, 10000 Zagreb
Sažetak
Especially important for the coastal area of Croatia is the wind forecast, particularly during the bura windstorm episodes. Current operational version of ALADIN model is rather satisfactory for the wind field forecast, although in many cases the wind speed is somewhat overestimated. A modified subgrid scale orography representation was introduced and tested. The envelope was removed and to compensate for the loss of volume, changes in gravity wave drag parametrisation were introduced. New orography representation resulted in slight enhancement of upstream and general decrease of downstream wind speed, as well as reduction of mountain wave amplitude.
Ključne riječi
Orography; Envelope; Gravity Wave Drag; Parametrization; Bura
Hrčak ID:
64568
URI
Datum izdavanja:
15.12.2005.
Posjeta: 1.012 *