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Jesse O. Bash, Patricia Bresnahan, and David R. Miller

surface emission models of Lin and Tao (2003) , Bash et al. (2004) , and Gbor et al. (2006) . Atmosphere–surface water fluxes are a function of the equilibrium between the atmospheric and surface water concentrations of dissolved Hg 0 and a turbulent enhanced transfer velocity ( Rolfhus and Fitzgerald 2001 ). In addition, the aqueous chemistry of mercury in the surface waters indicates that the dissolved elemental mercury primarily comes from the photoreduction of aqueous Hg 2+ and particulate

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Ho-Chun Huang, Xin-Zhong Liang, Kenneth E. Kunkel, Michael Caughey, and Allen Williams

1. Introduction Human activities have led to several important air quality issues, such as elevated tropospheric ozone (O 3 ), particulate matter, and visibility problems, which affect human health and the natural environment. Anthropogenic increases in atmospheric concentrations of greenhouse gases also are increasing concerns about future climate change ( Houghton et al. 2001 ). Global warming could have detrimental effects on future air quality, such as increased frequency of harmful

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