The thermally driven wind system of the Adige Valley in the Alps.
Giovannini G., Laiti L., Serafin S., Zardi D.
Data from permanent weather stations along the Adige Valley covering the period 2012--2014 are analysed, to evaluate the main characteristics of valley winds. The typical alternating pattern of upvalley winds -peaking in the afternoon- and down-valley winds -weaker but persisting throughout the night- is clearly observed. This daily wind cycle is associated with a corresponding cycle of the horizontal pressure gradient, as shown by the daily oscillation of the surface-level pressure at the valley stations. In particular, the wind intensity depends linearly on the along-valley pressure gradient, supporting the concept of a quasi-steady balance between pressure gradient and surface friction.