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Croatian Meteorological Journal, Vol. 40 No. 40, 2005.

Original scientific paper

ALADIN/HR: TESTING THE NEW SUB-GRID SCALE OROGRAPHY REPRESENTATION ON BURA CASES

Dunja Drvar orcid id 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

Full text: english pdf 425 Kb

page 304-307

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Abstract

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.

Keywords

Orography; Envelope; Gravity Wave Drag; Parametrization; Bura

Hrčak ID:

64568

URI

https://hrcak.srce.hr/64568

Publication date:

15.12.2005.

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