| Autor: |
John M. McManus, Jay S. Jacobson |
| Rok vydání: |
1985 |
| Předmět: |
|
| Zdroj: |
Atmospheric Environment (1967). 19:501-506 |
| ISSN: |
0004-6981 |
| DOI: |
10.1016/0004-6981(85)90170-2 |
| Popis: |
SO 2 concentrations for two consecutive growing seasons were obtained from an eleven-station monitoring network in a portion of the Ohio River Valley that contains four coal-fired generating stations. Elevated SO 2 concentrations occurred at all sites with a diurnal pattern that provided higher frequencies of occurrence between 1100 and 1700 hours. Most episodes with concentrations equal to or greater than 267 μg m −3 (0.1 ppm) were brief, lasting for two hours or less. These episodes rarely occurred on two or more consecutive days. Elevated NO x was associated with elevated SO 2 . Temporal patterns of SO 2 occurrence as well as concentrations and durations of exposures should be duplicated in experiments with annual vegetation species if results are to relate to actual field conditions near sources. Since patterns vary with topography, climate and source-receptor relationships, SO 2 exposure patterns in experiments with vegetation should be tailored to the particular region under study. |
| Databáze: |
OpenAIRE |
| Externí odkaz: |
|
