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OLS Field Name OLS Field Data
Main Title Elevated Plume Transport and Diffusion: 20-150 km Downwind of Beijing, P.R.C.
Author Lamb, B. ; Fu, Z. X. ; Eskridge, R. E. ; Benner, R. ; Westberg, H. ;
CORP Author Washington State Univ., Pullman. Lab. for Atmospheric Research. ;Academia Sinica, Beijing (China). ;Computer Sciences Corp., Research Triangle Park, NC.;Environmental Protection Agency, Research Triangle Park, NC. Atmospheric Research and Exposure Assessment Lab.
Publisher c1990
Year Published 1990
Report Number EPA-R-810230-01 ;EPA-R-812632-01; EPA/600/J-90/463;
Stock Number PB91-183269
Additional Subjects Plumes ; Dispersing ; Atmospheric circulation ; Pollution transport ; Simulation ; Diffusion ; Sulfur hexafluoride ; Field tests ; Mathematical models ; Gauss equation ; Reprints ; Tracer gas ; Beijing(Peoples Republic of China)
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NTIS  PB91-183269 Most EPA libraries have a fiche copy filed under the call number shown. Check with individual libraries about paper copy. NTIS 09/04/1991
Collation 11p
Abstract
Three mobile continuous analyzers and an array of fixed sequential syringe samplers were used to measure plume dispersion rates of SF6 released from a 300 m tower in Beijing during strong, steady winds with neutral conditions. The plume trajectories over the flat, open terrain downwind of Beijing were relatively straight. Predicted plume trajectories based on interpolated wind fields from surface and upper air data exhibited a mean separation error of 4 km at 70 km downwind. Maximum predicted concentrations from a Gaussian puff model agreed within a factor of two with observed surface profiles when the source was given an initial vertical distribution to account for the effects of wind shear upon horizontal dispersion. Short-term (i.e., 10 to 20 min averaging time) horizontal dispersion rates were essentially equal to the neutral Pasquill-Gifford curve. Dispersion coefficients from hourly-averaged concentration profiles were 30% larger than the PG neutral curve, but 50% smaller than a linear neutral curve based upon dispersion data collected downwind of a power plant.