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Alan Z Liu

Selected Works

Instability

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Tomex: Mesospheric And Lower Thermospheric Diffusivities And Instability Layers, R. L. Bishop, M. F. Larsen, J. H. Hecht, Alan Z. Liu, C. S. Gardner Oct 2013

Tomex: Mesospheric And Lower Thermospheric Diffusivities And Instability Layers, R. L. Bishop, M. F. Larsen, J. H. Hecht, Alan Z. Liu, C. S. Gardner

Alan Z Liu

The Turbulent Oxygen Mixing Experiment (TOMEX), which was carried out at White Sands Missile Range in New Mexico on 26 October 2000, included a rocketborne trimethyl aluminum (TMA) chemical tracer experiment. The subsequent TMA trails provided detailed information about the horizontal neutral wind, turbulence, and diffusivity properties of the atmosphere between approximately 85 and 140 km altitude. Measurements with the University of Illinois Na wind/temperature lidar located at the Starfire Optical Range, NM, provided a detailed time history of the stability properties between 85 and 105-km altitude, including high-resolution wind and temperature measurements prior to and during the chemical tracer …


Unstable Layers In The Mesopause Region Observed With Na Lidar During The Turbulent Oxygen Mixing Experiment (Tomex) Campaign, Alan Z. Liu, Raymond G. Roble, James H. Hecht, Miguel F. Larsen, Chester S. Gardner Oct 2013

Unstable Layers In The Mesopause Region Observed With Na Lidar During The Turbulent Oxygen Mixing Experiment (Tomex) Campaign, Alan Z. Liu, Raymond G. Roble, James H. Hecht, Miguel F. Larsen, Chester S. Gardner

Alan Z Liu

The Na wind/temperature lidar located at Starfire Optical Range near Albuquerque, New Mexico, provided real time measurements of wind, temperature, and Na density in the mesopause region during the TOMEX rocket campaign in October 2000. The state of the atmosphere in which the rocket was launched into was examined using the lidar measurements. Both convectively and dynamically unstable layers were observed at various times and altitudes during the night. The low convective stability region below 90 km was found to be associated with the diurnal tide. The unstable layers are the combined results of wave and tidal perturbations. Comparison with …