| Autor: |
Skelly, John M.1, Ferdinand, Jonathan A.2, Savage, James E.2, Jagodzinski, Jeanne M.3, Mulik, James D.4 |
| Předmět: |
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| Zdroj: |
Journal of the Air & Waste Management Association (Air & Waste Management Association). Sep2001, Vol. 51 Issue 9, p1280-1287. 8p. 1 Black and White Photograph, 3 Charts, 5 Graphs. |
| Abstrakt: |
Ogawa passive O[sub3] samplers were used in a 13-week study (June 1-September 1, 1999) involving 11 forested and mountaintop sites in north-central Pennsylvania. Four of the sites were collocated with TECO model 49 O[sub3] analyzers. A significant correlation (p < 0.0001) was found for 24-hr average weekly O[sub3] concentrations between the two methodologies at the four sites with collocated monitors. As expected, there were positive relationships between increasing elevation of the sites and increasing O[sub3] concentrations. No O[sub3] exposure patterns were found on a west-to-east or south-to-north basis; however, the area known for lower O[sub3] exposures within a smaller subsection of the study area showed consistently lower O[sub3] exposures. Preliminary results regarding relationships of symptom responses within O[sub3]-sensitive bioindicators are also presented with black cherry (Prunus serotina, Ehrh.) and common milkweed (Asclepias syriaca, L.) showing clear evidence of increasing injury with increasing O[sub3] exposures. Due to the extremely dry conditions encountered in north-central Pennsylvania during the 1999 growing season, O[sub3]-induced symptoms were sporadic and quite delayed until late-season rains during the latter portion of the observation period. [ABSTRACT FROM AUTHOR] |
| Databáze: |
GreenFILE |
| Externí odkaz: |
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