Main Title |
Continued Research in Mesoscale Air Pollution Simulation Modeling. Volume 5. Refinements in Numerical Analysis, Transport, Chemistry, and Pollutant Removal. |
Author |
Killus, J. P. ;
Meyer, J. P. ;
Durran, D. R. ;
Anderson, G. E. ;
Jerskey, T. N. ;
|
CORP Author |
Systems Applications, Inc., San Rafael, CA.;Environmental Sciences Research Lab., Research Triangle Park, NC. |
Year Published |
1984 |
Report Number |
EPA-68-02-2216; EPA/600/3-84/095A; |
Stock Number |
PB85-137362 |
Additional Subjects |
Air pollution ;
Mathematical models ;
Atmospheric models ;
Computerized simulation ;
Transport properties ;
Chemistry ;
Air pollution control ;
Aerosols ;
Concentration(Composition) ;
Ozone ;
Nitrogen dioxide ;
Sulfur dioxide ;
Airshed model ;
Numerical solution
|
Holdings |
Library |
Call Number |
Additional Info |
Location |
Last Modified |
Checkout Status |
NTIS |
PB85-137362 |
Some EPA libraries have a fiche copy filed under the call number shown. |
|
07/26/2022 |
|
Collation |
238p |
Abstract |
Two numerical integration methods identified as having features that provided significant improvements over the technique originally embedded in the Airshed Model have been evaluated. Of particular concern was the treatment of horizontal transport. In the evaluation of the schemes, the predictions resulting from the SHASTA method differed no more than about 20 percent from those generated using the original method. In addition, SHASTA posseses the better blend of computational speed and minimum error propagation. An objective analysis technique for obtaining a gridded, time-varying, fully three-dimensional wind field for the Airshed Model from available measurements has been developed. The technique accounts for urban heat island effects and should be directly applicable to relatively flat areas. A 42-step chemical kinetic mechanism for describing the chemical transformations of organics, NOx, O3, and SO2 and the production of sulfate, nitrate, and organic aerosols is presented. A unique feature of this mechanism is the explicit consideration given to the carbon bonds making up each organic molecule. An algorithm that relates the effective deposition velocity to the stability of the atmosphere and the type of surface has been implemented in the Airshed Model. Surface removal processes may significantly affect the concentrations of O3, NO2, and SO2. |
Supplementary Notes |
See also PB-257 529, and PB85-137370. Portions of this document are not fully legible. |
NTIS Title Notes |
Final rept. Oct 79-Jul 82. |
PUB Date Free Form |
Dec 84 |
Category Codes |
13B; 68A |
NTIS Prices |
PC A11/MF A01 |
Primary Description |
600/09 |
Document Type |
NT |
Cataloging Source |
NTIS/MT |
Control Number |
507411640 |
Origin |
NTIS |
Type |
CAT |