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Permanent link (DOI): https://doi.org/10.7939/R3PN8XJ00

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Source-receptor relationships for speciated atmospheric mercury at the remote Experimental Lakes Area, northwestern Ontario, Canada Open Access

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Author or creator
Cheng, I.
Zhang, L.
Blanchard, P.
Graydon, J.A.
St. Louis, V.L.
Additional contributors
Subject/Keyword
particulate matter
network data
United States
wet deposition
positive matrix factorization
natural sources
inorganic ions
source aportionment
reactive gaseous mercury
trajectory statistical-methods
Type of item
Journal Article (Published)
Language
English
Place
Time
Description
Source-receptor relationships for speciated atmospheric mercury measured at the Experimental Lakes Area (ELA), Northwestern Ontario, Canada were investigated using various receptor-based approaches. The data used in this study include gaseous elemental mercury (GEM), mercury bound to fine airborne particles (< 2.5 μm) (PHg), reactive gaseous mercury (RGM), major inorganic ions, sulphur dioxide, nitric acid gas, ozone, and meteorological variables, all of which were measured between May 2005 and December 2006. The source origins identified were related to transport of industrial and combustion emissions (associated with elevated GEM), photochemical production of RGM (associated with elevated RGM), road-salt particles with adsorption of gaseous Hg (associated with elevated PHg and RGM), crustal/soil emissions, and background pollution. Back trajectory modelling illustrated that a remote site, like the ELA, is affected by distant Hg point sources in Canada and the United States. The sources identified from correlation analysis, principal components analysis and K-means cluster analysis were generally consistent. The discrepancies between the K-means and Hierarchical cluster analysis were the clusters related to transport of industrial/combustion emissions, photochemical production of RGM, and crustal/soil emissions. Although it was possible to assign the clusters to these source origins, the trajectory plots for the Hierarchical clusters were similar to some of the trajectories belonging to several K-means clusters. This likely occurred because the variables indicative of transport of industrial/combustion emissions were elevated in at least two or more of the clusters, which means this Hg source was well-represented in the data.
Date created
2012
DOI
doi:10.7939/R3PN8XJ00
License information
Creative Commons Attribution 3.0 Unported
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Citation for previous publication
Cheng, I., Zhang, L., Blanchard, P., Graydon, J. A., & Louis, V. L. S. (2012). Source-receptor relationships for speciated atmospheric mercury at the remote Experimental Lakes Area, northwestern Ontario, Canada. Atmospheric Chemistry and Physics, 12(4), 1903-1922.
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