The thermally driven wind system of the Adige Valley in the Alps.

Giovannini G., Laiti L., Serafin S., Zardi D.
  Mercoledì 13/09   09:00 - 13:00   Aula A210   IV - Geofisica e fisica dell'ambiente
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.