Physical modelling of baroclinic development in the lee of the Alps

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A. Longhetto
L. Briatore
G. Chabert d'Hieres
H. Didelle
E. Ferrero
C. Giraud

Abstract

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.

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How to Cite
1.
Longhetto A, Briatore L, Chabert d’Hieres G, Didelle H, Ferrero E, Giraud C. Physical modelling of baroclinic development in the lee of the Alps. Ann. Geophys. [Internet]. 1997Nov.25 [cited 2021Jun.14];40(5). Available from: https://www.annalsofgeophysics.eu/index.php/annals/article/view/3861
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