Orographic Influence on Adriatic Vortex Generation
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Transcript of Orographic Influence on Adriatic Vortex Generation
Orographic Influence on Adriatic Vortex Generation
Branka Ivančan-Picek and Vesna Jurčec
Meteorological and Hydrological Service
Zagreb, Croatia
e-mail: [email protected]
ICAM/MAP2003, BRIG, 18 - 23 May 2003
ICAM/MAP2003, BRIG, 18 - 23 May 2003
Subject:
cyclonic vortex genesis in the wind field
Purpose:
is to link the Alpine mesoscale wind characteristics to the vortex appearance following an intensive local-scale convective process during MAP IOP5
Gomis et al. (1990)- Meteor.Atmos.Phys.Jurčec et al. (1996)-Meteorologische Zeitschrift Ivančan-Picek and Tutiš (1996)- TellusBrzović (1999)- Contr.Atmos.Phys.Ivančan-Picek et al. (2003) - Meteorologische Zeitschrift
ICAM/MAP2003, BRIG, 18 - 23 May 2003
Adriatic vortex and wind characteristics:
200 km
BURA
JUGO
ICAM/MAP2003, BRIG, 18 - 23 May 2003
Scale separation technique:
Maddox (1980);Gomis et al. (1990);Jurčec et al. (1996); Ivančan-Picek (1998);
F1 and F2 are for low-pass
filters used to define the bandpass (mesoscale)filter BR. F2 also defines the macroscale field.
ICAM/MAP2003, BRIG, 18 - 23 May 2003
Data: all available data in the Adriatic coast and islands in addition to ordinary synoptic data
ICAM/MAP2003, BRIG, 18 - 23 May 2003
ICAM/MAP2003, BRIG, 18 - 23 May 2003
ICAM/MAP2003, BRIG, 18 - 23 May 2003
Focus:On the identification of mesoscale vortices in the high-resolution ALADIN model wind field
MAP IOP5
ICAM/MAP2003, BRIG, 18 - 23 May 2003
IOP5, 4 Oct 00 +
ICAM/MAP2003, BRIG, 18 - 23 May 2003
IOP5, 4 Oct 00 +
ICAM/MAP2003, BRIG, 18 - 23 May 2003
Conclusions:
Orographic influence on vortex generation comes from the mountain effect on the wind field - particularly on intensity and duration of Adriaticlocal winds bura and jugo
The three main currents over Alpine region are responsible for vortex generation:large scale flow - over eastern and western side of the Alpsmesoscale cross-Alpine flow confined to valley transverse sections toward the Genoa bay