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| Titel |
Concentration-weighted trajectory approach to identifying potential sources of speciated atmospheric mercury at an urban coastal site in Nova Scotia, Canada |
| VerfasserIn |
I. Cheng, L. Zhang, P. Blanchard, J. Dalziel, R. Tordon |
| 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 ; 13, no. 12 ; Nr. 13, no. 12 (2013-06-23), S.6031-6048 |
| Datensatznummer |
250018718
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| Publikation (Nr.) |
 copernicus.org/acp-13-6031-2013.pdf |
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| Zusammenfassung |
| Regional and local sources contributing to gaseous
elemental mercury (GEM), gaseous oxidized mercury (GOM), and particle-bound
mercury (PBM) at an urban coastal site in Dartmouth, Nova Scotia, Canada
were investigated using the Concentration-Weighted Trajectory model (CWT)
and Conditional Probability Function. From 2010–2011, GEM, GOM, and PBM
concentrations were 1.67 ± 1.01 ng m−3, 2.07 ± 3.35 pg m−3,
and 2.32 ± 3.09 pg m−3, respectively. Seasonal
variability was observed, with statistically higher GEM and PBM
concentrations in winter and spring and higher GOM in spring. In the CWT,
concentrations are the weighting factors for the trajectory residence time
in modeled grid cells, which results in the identification of source areas
based on the CWT values in the grid cells. Potential source areas were
identified in regions with known industrial Hg sources particularly in the
fall season, but also in regions without these sources (e.g. Atlantic Ocean,
northern Ontario and Quebec). CWTs for GOM and PBM that were associated with
≥ 5 kg industrial Hg emissions from 2010–2011 were statistically larger
than those with zero Hg emissions, despite a lack of strong correlations. A
large proportion of elevated CWTs (85–97%) was in regions with zero
industrial Hg sources indicating the potential role of non-point sources,
natural emissions, and residential-scale combustion. Analysis of wind data
suggests that a commercial harbor and vehicular traffic were potential
local sources. Evaluating modeled source areas against Hg emissions
inventories was not an ideal method for assessing the CWT model accuracy
because of insufficient data on Hg emissions at more precise locations. |
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