Abstract
During a coordinated campaign devoted to wave-turbulence interactions, measurements with the high vertical resolution PROUST radar and radiosounding have been performed in an upper level potential vorticity anomaly. This campaign took place during September 1996 at St Santin, France, (44° 39′N, 2° 12′E), where the radar is located. Radiosonde data reveal, along the eastern part of the nomaly, the presence of a saturated wave field, while the radar observes turbulent activity in regions of wave-induced windshears. Characteristic parameters of the a saturation mechanism determined by the radar and radiosondes are in generally good agreement with the saturation onset conditions provided by linear saturation theory. The predicted relationship between vertical wavelength, period and energy dissipation rate proposed by the saturated-cascade theory is also assessed, although the proportionality factor is smaller than foreseen. When approaching the jetstream region, modulation by the wave field of the background windshear gives rise to Kelvin–Helmholtz instabilities whose convective billows are observed by the radar.
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