engleski

Mountain Wave related turbulence derived from sonic anemometers and an elastic backscatter Lidar

A case study of mountain wave related turbulence during the Terrain-induced Rotor EXperiment in the Owens Valley is presented. Large spatial and temporal variability in aerosol backscatter was observed in the valley atmosphere associated with mountain wave activity. The corresponding turbulence structure along and across the valley was investigated using data collected by three 30 m NCAR towers equipped with 6 levels of ultrasonic anemometers. Time series of turbulent kinetic energy (TKE) show much higher levels of TKE in the valley center than on the sloping western part of the valley. An analysis of the TKE budget shows that mechanical production of turbulence is dominant and balanced by turbulent dissipation in central parts of the valley. The data and analysis from this case study can be used to evaluate and improve turbulence parameterization schemes in atmospheric numerical models.

T-REX experiment; turbulent kinetic energy; budget equation; dissipation rate

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