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PLUME DISPERSION IN THE CONVECTIVE BOUNDARY LAYER PART I: CONDORS FIELD EXPERIMENT AND EXAMPLE MEASUREMENTS
Citation:
Eberhard, W., W. Moniger, AND G. Briggs. PLUME DISPERSION IN THE CONVECTIVE BOUNDARY LAYER PART I: CONDORS FIELD EXPERIMENT AND EXAMPLE MEASUREMENTS. U.S. Environmental Protection Agency, Washington, D.C., EPA/600/J-88/331 (NTIS PB89206684), 1989.
Description:
The dispersion of plumes of passive tracers in highly convective boundary layers was measured during late summer in 1982 and 1983. he 30O-m tower of the Boulder Atmospheric Observatory supplied meteorological data and served as the platform for elevated sources. he parameters in convective scaling theory were determined, and extensive information on wind statistics was gathered. ixed layer height was a consensus of determinations-from the vertical extent of remotely sensed tracers, from on-site radiosonde profiles, and from lidar-observed gradients of the haze. The lidar measured the three-dimensional distribution of oil fog, and a radar similarly observed a plume of microwave-scattering chaff. areful processing successfully removed interfering effects, such as attenuation of the lidar radiation and ground clutter in the radar signal. lthough these tracers were not conserved, the profile, shapes are trustworthy, and local downwind flux of measured concentrations was successfully applied in place of the release rate. owever, any interpretation of the chaff data must consider the effect of gravitational settling. wo conservative gas tracers were also sampled on a single arc at the surface during the 1983 phase. reliminary examination of the results indicates that the average vertical profiles are significantly non-Gaussian in shape in agreement with earlier laboratory and numerical simulations.