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| Titel |
Trends in concentrations of atmospheric gaseous and particulate species in rural eastern Tennessee as related to primary emission reductions |
| VerfasserIn |
R. L. Tanner, S. T. Bairai, S. F. Mueller |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1680-7316
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| Digitales Dokument |
URL |
| Erschienen |
In: Atmospheric Chemistry and Physics ; 15, no. 17 ; Nr. 15, no. 17 (2015-09-01), S.9781-9797 |
| Datensatznummer |
250120007
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| Publikation (Nr.) |
 copernicus.org/acp-15-9781-2015.pdf |
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| Zusammenfassung |
Air quality measurements at Look Rock, Tennessee – on the western edge of
the Great Smoky Mountains National Park – were begun in 1980 and expanded
during the 1980s to a National Park Service (NPS) IMPROVE network station.
Measurements were expanded again by the Tennessee Valley Authority (TVA,
1999–2007) to examine the effects of electric generating unit (EGU) emission
reductions of SO2 and NOx on air quality at the station. Analysis
of temporal trends (1999–2013) has been conducted at the site in
collaboration with activities related to the 2013 Southeast Atmosphere Study
(SAS) at Look Rock and other southeastern US locations.
Key findings from these trend studies include the observation that primary
pollutant levels have consistently tracked emission reductions from EGUs
and other primary sources in the region, but reductions in secondary
pollutants such as particulate sulfate and, specifically, ozone have been
smaller compared to reductions in primary emissions. Organic carbonaceous
material (OM) remains a major contributor (30–40 % in the period
2009–2013) to fine particulate mass at the site, as confirmed by ACSM
measurements at the site in 2013. A large portion (65–85 %) of carbon
in OM derives from modern carbon sources based on 14C measurements.
Important parameters affecting ozone levels, fine mass, and visibility also
include the specific diurnal meteorology at this ridge-top site, its
location in a predominantly mixed-deciduous forest, and the presence of
primary sources of precursors at distances of 50–500 km from the site in all
directions. |
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