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Briatore, L.
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Briatore, L.
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- PublicationOpen AccessPhysical modelling of baroclinic development in the lee of the Alps(1997-10)
; ; ; ; ; ; ;Longhetto, A.; Dipartimento di Fisica Generale, Università di Torino, Italy ;Briatore, L.; Dipartimento di Fisica Generale, Università di Torino, Italy ;Chabert d'Hieres, G.; IMG, Institute of Mechanics University of Grenoble, France ;Didelle, H.; IMG, Institute of Mechanics University of Grenoble, France ;Ferrero, E.; Dipartimento di Scienze e Tecnologie Avanzate, Università di Alessandria, Italy ;Giraud, C.; Istituto di Cosmo-Geofisica, C.N.R., Torino, Italy; ; ; ; ; When baroclinic development is triggered by an obstacle, like an extended mountain range, the so-called lee, or secondary cyclogenesis can develop. The presence of the obstacle exerts a blocking effect on the lower layers of the impinging airflow, forcing them to go round its borders and reach the lee region with a delay. Blocking and delay are both responsible for the initial pressure decrease downwind of the mountain and for the subsequent proper downstream baroclinic development. According to this rather simple scheme, a cyclogenesis episode in the lee of the Alps was simulated in a hydraulic turntable. The results of these experiments showed a good agreement, both from a qualitative and quantitative point of view, with the analysis of an episode of lee cyclogenesis coupled to a cold outbreak in the Mediterranean, which actually occured in Southern Europe downstream of the Alps.112 132