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BORA IN REGIONAL CLIMATE MODELS: IMPACT OF MODEL RESOLUTION ON SIMULATIONS OF GAP WIND AND WAVE BREAKING

LUKAS JOSIPOVIĆ orcid.org/0000-0002-0244-5615 ; Institute for Atmospheric and Environmental Sciences, Johann-Wolfgang-von- Goethe-University, Altenhöferallee 1, 60438, Frankfurt am Main, Germany
ANIKA OBERMANN-HELLHUND orcid.org/0000-0003-4275-3986 ; Institute for Atmospheric and Environmental Sciences, Johann-Wolfgang-von- Goethe-University, Altenhöferallee 1, 60438, Frankfurt am Main, Germany
ERWAN BRISSON orcid.org/0000-0003-2558-2556 ; Institute for Atmospheric and Environmental Sciences, Johann-Wolfgang-von- Goethe-University, Altenhöferallee 1, 60438, Frankfurt am Main, Germany
BODO AHRENS orcid.org/0000-0002-6452-3180 ; Institute for Atmospheric and Environmental Sciences, Johann-Wolfgang-von- Goethe-University, Altenhöferallee 1, 60438, Frankfurt am Main, Germany

Sažetak

Bora, a mesoscale wind system on the eastern Adriatic coast, profoundly impacts the local weather conditions. During easterly inflow, wave breaking generates heavy downslope winds in the lee of the Dinaric Alps. Additionally, gap winds emerge in canyons like the Vratnik Pass near Senj and enhance the Bora to a jet-like flow. The representation of these processes in numerical models is highly dependent on the surface description and therefore on model grid spacing.
This study evaluates two simulations with the regional climate model COSMO-CLM with grid spacing of 0.025° and 0.11° regarding Bora winds. Strong Bora events are discussed in detail using observations between December 1999 and November 2000. The model results show that a 0.025° high-resolution simulation can well
reproduce both phenomena gap wind and wave breaking. The 0.11° simulation resolves gap winds surprisingly well but misses wave breaking events.

Ključne riječi

Bora; wave breaking; gap winds; regional climate models

Hrčak ID:

231266

URI

https://hrcak.srce.hr/231266

Datum izdavanja:

26.12.2019.

Posjeta: 1.800 *