Ground based measurements, including both conventional meteorological instruments and advanced sensors (namely an ultrasonic anemometer and a doppler sodar) have been obtained.
Also airborne measurement with an equipped motor-glider have been collected and analyzed with geostatistical techniques in order to evaluate the spatial distribution of potential temperature within a valley cross-section.
The subsequent data analysis, which includes surface fluxes estimate, exhibits specific features of the investigated area, and in particular the effects of local circulation and secondary flows like ana/katabatic winds which may possibly affect the fate of pollutants emitted by different sources.
The spectral analysis of the velocity components shows some interesting aspects too: together with the expected dependance on frequency in an inertial subrange, one may observe an excess of low frequency energy which indicates disturbances in the flow produced by terrain inhomogeneity.
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