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RECORD NUMBER: 39 OF 173

Main Title Convection Tank Experiments on Top-Down, Bottom-Up Diffusion.
Author Piper, M.; Wyngaard, J. C.; Synder, W. H.; Lawson, R. E.;
CORP Author Pennsylvania State Univ., University Park. Dept. of Meteorology. ;National Oceanic and Atmospheric Administration, Silver Spring, MD. Atmospheric Sciences Modeling Div.;Environmental Protection Agency, Research Triangle Park, NC. Atmospheric Research and Exposure Assessment Lab.
Publisher Dec 94
Year Published 1994
Report Number EPA-R821211; EPA/600/A-95/008;
Stock Number PB95-177291
Subjects Atmospheric boundary layer; Convection currents; Eddies; Turbulent diffusion; Experimental design; Air flow; Atmospheric temperature; Large-eddy simulation
Holdings
Library   Call Number Additional Info Location Date Modified
NTIS PB95-177291 Most EPA libraries have a fiche copy filed under the call number shown. Check with individual libraries about paper copy. NTIS 05/26/1995
Collation 8p
Abstract Large-eddy simulation (LES) results indicate the scalar diffusion in the convective atmospheric boundary layer (CBL) has interesting properties. A scalar introduced into the bottom of the CBL with no flux through the top (bottom-up diffusion) has a radically different eddy diffusivity profile than a scalar introduced at the CBL top with zero flux through the surface (top-down diffusion). To test the LES results, we designed and implemented a set of experiments in a replica of the original Deardorff-Willis laboratory convection tank. We measured mean gradients and inferred flux profiles of two scalars, temperature and dye concentration, to calculate vertical profiles of the top-down and bottom-up eddy diffusivities. Our experimental results were in good agreement with the LES results.
Supplementary Notes Prepared in cooperation with National Oceanic and Atmospheric Administration, Silver Spring, MD. Atmospheric Sciences Modeling Div. Sponsored by Environmental Protection Agency, Research Triangle Park, NC. Atmospheric Research and Exposure Assessment Lab.
Category Codes 55B
NTIS Prices PC A02/MF A01
Primary Description 600/09
Document Type NT
Control Number 509022255
Cataloging Source NTIS/MT
Origin NTIS
Type CAT


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