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Issue 12, 2013
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Mercury wet deposition in the eastern United States: characteristics and scavenging ratios

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Abstract

Wet deposition is an important atmospheric mercury (Hg) pathway between air and terrestrial ecosystems. It is measured at numerous locations in the United States (U. S.) as part of the Mercury Deposition Network (MDN). The annual Hg wet deposition flux in 2009 at four locations in the northeastern U. S. (MDN sites MD08, VT99, NY20, and NY43) ranged from 6.4 to 13.4 μg per m2 year which is higher than modeled reactive Hg (RM) dry deposition for this region. The highest ambient RM concentrations were seen at MD08, which is closest to significant anthropogenic sources; however, the volume-weighted mean Hg concentrations in precipitation were similar at these four sites. Mass based scavenging ratios (SC) of RM ranged from 1700 to 4500. Differences in SCs were likely a result of differences in meteorological conditions, the forms of RM in the atmosphere, vertical concentration variations, and measurement uncertainties, including precipitation depth and RM concentrations. RM SCs were higher than those reported for other soluble species. Multiple linear regression suggests that gaseous oxidized Hg is responsible for the majority of the scavenged RM.

Graphical abstract: Mercury wet deposition in the eastern United States: characteristics and scavenging ratios

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Publication details

The article was received on 30 Aug 2013, accepted on 24 Oct 2013 and first published on 04 Nov 2013


Article type: Paper
DOI: 10.1039/C3EM00454F
Environ. Sci.: Processes Impacts, 2013,15, 2321-2328

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    Mercury wet deposition in the eastern United States: characteristics and scavenging ratios

    J. Huang, F. Chang, S. Wang, Y. Han, M. Castro, E. Miller and T. M. Holsen, Environ. Sci.: Processes Impacts, 2013, 15, 2321
    DOI: 10.1039/C3EM00454F

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