Main Title |
Stagnation Diffusion Observed in a Deeply Pooling Valley during STAGMAP. |
Author |
Briggs, G. A. ;
|
CORP Author |
National Oceanic and Atmospheric Administration, Research Triangle Park, NC. Atmospheric Sciences Modeling Div.;Environmental Protection Agency, Research Triangle Park, NC. Atmospheric Research and Exposure Assessment Lab. |
Publisher |
1992 |
Year Published |
1992 |
Report Number |
EPA/600/A-92/233; |
Stock Number |
PB93-120897 |
Additional Subjects |
Stagnation point ;
Air pollution ;
Valleys ;
Heat flux ;
Atmospheric diffusion ;
Aerosols ;
Tracer studies ;
Atmospheric models ;
Field tests ;
Stagnation Model Analysis Program ;
Medford air basin
|
Holdings |
Library |
Call Number |
Additional Info |
Location |
Last Modified |
Checkout Status |
NTIS |
PB93-120897 |
Some EPA libraries have a fiche copy filed under the call number shown. |
|
07/26/2022 |
|
Collation |
10p |
Abstract |
Stagnation conditions are characterized by synoptic pressure gradients so weak that they have little or no effect on air flow near the ground. This flow and the turbulence accompanying it are driven mostly by surface heat flux inducing buoyancy, which interacts with terrain slopes. The resulting flows and diffusion patterns created by these flows are as varied as are topographies. Short-term diffusion is also strongly affected by uneven surface heating or cooling induced by various sun azimuths and elevations, uneven surface cover, soil type and moisture, and by uneven cloud shadowing. The endless possibilities makes the task of predicting 'worst case' concentrations from a particular source in a particular place seem almost impossible, but there is hope for useful predictions for time averaged impacts from arrays of many small sources, such as woodstoves. This is the primary focus of the experiment described in the paper. |
Supplementary Notes |
Sponsored by Environmental Protection Agency, Research Triangle Park, NC. Atmospheric Research and Exposure Assessment Lab. |
Category Codes |
68A; 55B |
NTIS Prices |
PC A02/MF A01 |
Primary Description |
600/09 |
Document Type |
NT |
Cataloging Source |
NTIS/MT |
Control Number |
300826097 |
Origin |
NTIS |
Type |
CAT |