| Main Title |
Surface inhomogeneity effects on convective diffusion / |
| Author |
Briggs, Gary A.
|
| CORP Author |
Environmental Sciences Research Lab., Research Triangle Park, NC. Meteorology and Assessment Div. |
| Publisher |
United States Environmental Protection Agency, Office of Research and Development, Atmospheric Sciences Research Laboratory, |
| Year Published |
1988 |
| Report Number |
EPA/600/J-88/334 |
| Stock Number |
PB89-206650 |
| Additional Subjects |
Atmospheric diffusion ;
Urban areas ;
Heat flux ;
Wind velocity ;
Atmospheric models ;
Mathematical models ;
Reprints ;
Convection(Atmospheric) ;
Atmospheric turbulence ;
Saint Louis(Missouri)
|
| Holdings |
| Library |
Call Number |
Additional Info |
Location |
Last
Modified |
Checkout
Status |
| NTIS |
PB89-206650 |
Some EPA libraries have a fiche copy filed under the call number shown. |
|
07/26/2022 |
|
| Collation |
21 pages ; 28 cm |
| Abstract |
It is suggested that convective scaling, with appropriate extensions, provides the most useful framework for estimating the effects of urban-scale surface inhomogeneities on diffusion in convective conditions. Strong contrasts in surface heat flux exist between cropland, forests, urban areas, and water or marshland surfaces. It is argued that a typical fetch for convective turbulence to readjust to changed heat (or buoyancy) input from the surface below is 2(U/w*)z(j), where U is the mean wind speed in the mixing layer, w* is the convective scaling velocity, and z(j) is the mixing depth. The ratio w*/U is the best index of diffusion rates in moderately to very unstable conditions. General urban effects on heat flux, z(j), and U are discussed separately, then their combined effects on w*/U are estimated. Finally, some examples of heat flux inhomogeneities causing stationary convective features are presented. |
| Notes |
"Reprint article published in Boundary-Layer Meteorology, vol. 45(1988), pp. 117-135." Caption title. "Journal article." Microfiche. |
| Contents Notes |
EPA/600/J-88/334. |
| Place Published |
Research Triangle Park, NC : |
| Supplementary Notes |
Pub. in Boundary-Layer Meteorology 45, p117-135 1988. |
| Corporate Au Added Ent |
Atmospheric Sciences Research Laboratory. |
| PUB Date Free Form |
1988. |
| NTIS Prices |
PC A03/MF A01 |
| BIB Level |
m |
| Cataloging Source |
OCLC/T |
| OCLC Time Stamp |
20000810131103 |
| Language |
eng |
| Origin |
NTIS |
| Type |
MERGE |
| OCLC Rec Leader |
01045nam 2200253Ka 45020 |
