Abstract
Multiple layers of turbulence were observed by an acoustic sounder in the Shakwak Valley of the southern Yukon. The layers, extending in time for more than five days, were found to correlate highly with temperature steps observed by a tethered balloon system. During the period of the observation, the wind was virtually calm and the skies clear, suggesting a radiational cause for the phenomenon. Various mechanisms are discussed with particular attention to the possibility of a dynamic instability of katabatic (Stewartson) sidewall layers. Order of magnitude estimates suggest that the lateral turbulent heat flux of such eddies is comparable to the radiational heat losses of the valley walls.
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