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Bowen Zhou and Fotini Katopodes Chow

conditions of strong winds and/or large cloud cover, which leads to reduced net radiative surface cooling ( Van de Wiel et al. 2003 ). On clear nights with weak winds, the SBL cools rapidly. Turbulent motions are strongly damped by buoyancy stratification. The SBL goes into a quiescent state, where turbulence is suppressed over prolonged periods greater than the time scale of the dominant eddies ( Nakamura and Mahrt 2005 ). In the intermittently turbulent SBL, energetic mixing events known as turbulent

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Michael Hill, Ron Calhoun, H. J. S. Fernando, Andreas Wieser, Andreas Dörnbrack, Martin Weissmann, Georg Mayr, and Robert Newsom

. The ability of the lidar to capture the incoming elevated gust of westward winds (see dark region of lidar signal to the left of Fig. 6b ) was likely associated with enhanced backscatter return associated with low-level clouds rolling over the mountain range (or, perhaps less likely, with the lofting and suspension of snow or dust caused by the impingement of strong cross-barrier winds on the surface upwind). The up-valley flow was shown to be fully displaced 30 min later by this gust and the

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