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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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James D. Doyle and Dale R. Durran

equations expressed using tensor notation are where c p is the specific heat at constant pressure, R d is the dry gas constant, g is the acceleration due to gravity, ρ is the density, c is the speed of sound, ν is the hyperdiffusion coefficient, and f the Coriolis force. In this study, the Coriolis force is specified as 10 −4 s −1 . The overbar variables correspond to the reference state, which is horizontally homogeneous and in hydrostatic balance. The turbulent subgrid-scale fluxes for

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Vanda Grubišić and Brian J. Billings

(MISS; Cohn et al. 2004 ). Both systems contain a 915-MHz boundary layer radar wind profiler, a Radio Acoustic Soundings System (RASS), radiosonde launch capability, and an automated surface station that measures temperature, relative humidity, pressure, wind speed and direction, rainfall accumulation, and radiative fluxes. MAPR was positioned in the center of the valley near the southern line of AWS ( Fig. 1c ). Since MAPR contains multiple vertically pointing antennae, it can obtain a horizontal

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

turbulence. A wide variety of in situ and remote sensors (both ground-based and airborne) was deployed in support of T-REX. In addition to the coherent Doppler lidars, other ground-based instrumentation included the NCAR Raman-Shifted Eye-safe Aerosol Lidar (REAL), thermosondes, sodar/RASS, flux towers, the NCAR Integrated Sounding System Multiple Antenna Profiler Radar, and HOBO weather stations (see Grubišić et al. 2004 for a more exhaustive list). Aircraft-based measurements were collected by the

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