Computer Science – Sound
Scientific paper
Jan 1993
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993phdt.........9a&link_type=abstract
Ph.D. Thesis Colorado Univ., Boulder, CO.
Computer Science
Sound
Atmospheric Boundary Layer, Atmospheric Sounding, Atmospheric Temperature, Meteorological Radar, Momentum, Planetary Boundary Layer, Radar Measurement, Temperature Measurement, Wind Velocity Measurement, Acoustic Sounding, Heat Flux, Precision, Sampling, Sonic Anemometers, Turbulence, Wind (Meteorology), Wind Velocity
Scientific paper
The planetary or atmospheric boundary layer is the lowest 100-2000 m of the atmosphere, and contains the sources of most energy and pollutants that affect the entire atmosphere. Boundary-layer structure and dynamics are key to understanding, modeling, and predicting climate, weather, and pollution. New and improved techniques for measuring the dynamics of the boundary layer are needed. One of the most important needs is for improved methods of measuring the turbulent fluxes of heat and momentum. Existing methods involving towers, surface measurements, or aircraft have limited flexibility or are expensive. This dissertation describes methods for measuring heat flux (virtual temperature flux) and momentum flux in convective boundary layers. The instrument used is the 916 MHz boundary-layer radar wind profiler radio acoustic sounding system (profiler/RASS). As the name suggests, the profiler was developed to make wind measurements, and this work is an expansion of its capabilities. The radio acoustic sounding system uses the profiler and attachments to measure virtual temperature. Before the profiler/RASS could be used to make flux measurements, the ability to make simultaneous measurements of wind velocity and temperature had to be developed. A feasibility study was conducted at Platteville, Colorado, in June 1991 to determine if flux measurements were a practical application of the profiler, with encouraging results. The Rural Oxidants in the Southern Environment II (ROSE II) experiment in Alabama in June 1992 provided the opportunity to compare flux measurements from the profiler/RASS to those made by a surface sonic anemometer and an aircraft, the National Center for Atmospheric Research (NCAR) King Air. The results indicate that the profiler/RASS is capable of making heat flux measurements that compare well with aircraft and surface measurements. The primary limitation on the precision of the measurements is the sampling uncertainty of the turbulence, a limitation that is the same for any fixed instrument. The feasibility of making momentum flux measurements needs to be explored further in more favorable conditions. In the course of analyzing the flux measurements, methods of determining the mixing depth (boundary layer height) and improved data quality control techniques were developed.
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