| Main Title |
Comparison of Telephotometer Measurements of Extinction Coefficients with Scattering and Absorption Coefficients. |
| Author |
Dzubay, T. G. ;
Clubb, K. W. ;
|
| CORP Author |
Environmental Sciences Research Lab., Research Triangle Park, NC. |
| Year Published |
1981 |
| Report Number |
EPA-600/J-81-015; |
| Stock Number |
PB82-205881 |
| Additional Subjects |
Light transmission ;
Light scattering ;
Visibility ;
Sulfates ;
Air pollution ;
Reprints ;
Extinction coefficients ;
Atmospheric transmissivity ;
Telephotometry ;
Air quality
|
| Holdings |
| Library |
Call Number |
Additional Info |
Location |
Last
Modified |
Checkout
Status |
| NTIS |
PB82-205881 |
Some EPA libraries have a fiche copy filed under the call number shown. |
|
07/26/2022 |
|
| Collation |
11p |
| Abstract |
During the summer of 1979, coefficients for light extinction in the atmosphere were calculated from measurements made with a telephotometer placed 251 m from a black target in Research Triangle Park, North Carolina. The results are well correlated (r = 0.92 to 0.96) with integrating nephelometer measurements of scattering coefficients and are highly correlated (r = 0.99) with daily averages of sums of scattering and absorption coefficients. The average sum of scattering and absorption coefficients accounts for about 90% of the average telephotometrically measured extinction coefficient; absorption by particles and nitrogen dioxide contributes 7% and 2%, respectively. From analysis of aerosol mass and composition, it is inferred that sulfate and its cations were the major cause of light extinction and haze at the measurement site. |
| Supplementary Notes |
Pub. in Atmospheric Environment, v15 n12 p2617-2624 1981. |
| NTIS Title Notes |
Journal article. |
| Title Annotations |
Reprint: Comparison of Telephotometer Measurements of Extinction Coefficients with Scattering and Absorption Coefficients. |
| PUB Date Free Form |
1981 |
| Category Codes |
4A; 55E; 68A |
| NTIS Prices |
PC A02/MF A01 |
| Primary Description |
600/09 |
| Document Type |
NT |
| Cataloging Source |
NTIS/MT |
| Control Number |
323814814 |
| Origin |
NTIS |
| Type |
CAT |
