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| Titel |
Estimation of mercury emissions from forest fires, lakes, regional and local sources using measurements in Milwaukee and an inverse method |
| VerfasserIn |
B. Foy, C. Wiedinmyer, J. J. Schauer |
| 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 ; 12, no. 19 ; Nr. 12, no. 19 (2012-10-02), S.8993-9011 |
| Datensatznummer |
250011490
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| Publikation (Nr.) |
 copernicus.org/acp-12-8993-2012.pdf |
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| Zusammenfassung |
| Gaseous elemental mercury is a global pollutant that can lead to serious
health concerns via deposition to the biosphere and bio-accumulation in the
food chain. Hourly measurements between June 2004 and May 2005 in an urban
site (Milwaukee, WI) show elevated levels of mercury in the atmosphere with
numerous short-lived peaks as well as longer-lived episodes. The measurements
are analyzed with an inverse model to obtain information about mercury
emissions. The model is based on high resolution meteorological simulations
(WRF), hourly back-trajectories (WRF-FLEXPART) and a chemical transport model
(CAMx). The hybrid formulation combining back-trajectories and Eulerian
simulations is used to identify potential source regions as well as the
impacts of forest fires and lake surface emissions. Uncertainty bounds are
estimated using a bootstrap method on the inversions. Comparison with the US
Environmental Protection Agency's National Emission Inventory (NEI) and Toxic
Release Inventory (TRI) shows that emissions from coal-fired power plants are
properly characterized, but emissions from local urban sources, waste
incineration and metal processing could be significantly under-estimated.
Emissions from the lake surface and from forest fires were found to have
significant impacts on mercury levels in Milwaukee, and to be underestimated
by a factor of two or more. |
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