Increased atmospheric deposition of mercury in reference lakes near major urban areas

Environmental Pollution
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Abstract

Atmospheric deposition of Hg is the predominant pathway for Hg to reach sensitive ecosystems, but the importance of emissions on near-field deposition remains unclear. To better understand spatial variability in Hg deposition, mercury concentrations were analyzed in sediment cores from 12 lakes with undeveloped watersheds near to (<50 km) and remote from (>150 km) several major urban areas in the United States. Background and focusing corrected Hg fluxes and flux ratios (modern to background) in the near-urban lakes (68 ?? 6.9 ??g m -2 yr -1 and 9.8 ?? 4.8, respectively) greatly exceed those in the remote lakes (14 ?? 9.3 ??g m -2 yr -1 and 3.5 ?? 1.0) and the fluxes are strongly related to distance from the nearest major urban area (r 2 = 0.87) and to population and Hg emissions within 50-100 km of the lakes. Comparison to monitored wet deposition suggests that dry deposition is a major contributor of Hg to lakes near major urban areas. ?? 2011 Elsevier Ltd. All rights reserved.

Additional publication details

Publication type Article
Publication Subtype Journal Article
Title Increased atmospheric deposition of mercury in reference lakes near major urban areas
Series title Environmental Pollution
DOI 10.1016/j.envpol.2011.11.003
Volume 162
Year Published 2012
Language English
Larger Work Type Article
Larger Work Subtype Journal Article
Larger Work Title Environmental Pollution
First page 209
Last page 215