Main Title |
Continued Research in Mesoscale Air Pollution Simulation Modeling. Volume 6. Further Studies in the Modeling of Microscale Phenomena. |
Author |
Lamb, R. G. ;
Durran, D. R. ;
Reid, L. E. ;
Shu, W. R. ;
Seinfeld, J. H. ;
|
CORP Author |
Systems Applications, Inc., San Rafael, CA. ;California Inst. of Tech., Pasadena.;Environmental Sciences Research Lab., Research Triangle Park, NC. |
Year Published |
1984 |
Report Number |
EPA-68-02-2216; EPA/600/3-84/095B; |
Stock Number |
PB85-137370 |
Additional Subjects |
Air pollution ;
Atmospheric models ;
Mathematical models ;
Urban areas ;
Ozone ;
Nitrogen oxides ;
Exhaust emissions ;
Transport properties ;
Concentration(Composition) ;
Point sources
|
Holdings |
Library |
Call Number |
Additional Info |
Location |
Last Modified |
Checkout Status |
NTIS |
PB85-137370 |
Some EPA libraries have a fiche copy filed under the call number shown. |
|
07/26/2022 |
|
Collation |
307p |
Abstract |
This report describes the development of techniques for modeling the microscale phenomena associated with urban air pollution. Such phenomena include turbulent diffusion, turbulent concentration fluctuations, and sub-grid scale variations in the time averaged concentration field. Optimal eddy diffusivities were reexamined to determine whether (1) the diffusivities are unique, (2) they have a universal form when properly scaled, and (3) they are dependent on source height. A model for describing the effects of turbulent concentration fluctuations on second-order chemical reactions has also been developed and tested. It was applied to the case of NO emanating from a point source into an O3 laden atmosphere. Results showed that the rate of conversion of NO to NO2 is greatly inhibited by turbulent concentration fluctuations, even under stable conditions. A method of paramaterizing the effects of chemical reaction rates of both subgrid-scale concentration variations arising from ground-level sources and turbulence-induced concentration fluctuations has also been developed. In addition, theoretical frameworks for two models of pollutant levels around roadways are introduced. |
Supplementary Notes |
See also PB85-137362, and PB85-137388. Prepared in cooperation with California Inst. of Tech., Pasadena. |
NTIS Title Notes |
Final rept. Oct 79-Jul 82. |
PUB Date Free Form |
Dec 84 |
Category Codes |
13B; 68A; 91A |
NTIS Prices |
PC A14/MF A01 |
Primary Description |
600/09 |
Document Type |
NT |
Cataloging Source |
NTIS/MT |
Control Number |
507411659 |
Origin |
NTIS |
Type |
CAT |