| 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 |
| Additional 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 |
Last
Modified |
Checkout
Status |
| NTIS |
PB95-177291 |
Some EPA libraries have a fiche copy filed under the call number shown. |
|
07/26/2022 |
|
| 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 |
| Cataloging Source |
NTIS/MT |
| Control Number |
509022255 |
| Origin |
NTIS |
| Type |
CAT |
