Aqueous Elemental Mercury Production versus Mercury Inventories in the Lake Michigan Airshed: Deciphering the Spatial and Diel Controls of Mercury Gradients in Air and WaterClick to copy article linkArticle link copied!
- Ryan F. Lepak*Ryan F. Lepak*U.S. EPA Office of Research and Development, Center for Computational Toxicology and Exposure, Great Lakes Toxicology and Ecology Division, 6201 Congdon Blvd., Duluth, MN 55804. Email: [email protected]Environmental Chemistry and Technology Program, University of Wisconsin−Madison, 660 North Park Street, Madison, Wisconsin 53706, United StatesUpper Midwest Water Science Center, USGS Mercury Research Laboratory, U.S. Geological Survey, 8505 Research Way, Middleton, Wisconsin 53562, United StatesCenter for Computational Toxicology and Exposure, Great Lakes Toxicology and Ecology Division, U.S. EPA Office of Research and Development, 6201 Congdon Boulevard, Duluth, Minnesota 55804, United StatesMore by Ryan F. Lepak
- Michael T. TateMichael T. TateUpper Midwest Water Science Center, USGS Mercury Research Laboratory, U.S. Geological Survey, 8505 Research Way, Middleton, Wisconsin 53562, United StatesMore by Michael T. Tate
- Jacob M. OgorekJacob M. OgorekUpper Midwest Water Science Center, USGS Mercury Research Laboratory, U.S. Geological Survey, 8505 Research Way, Middleton, Wisconsin 53562, United StatesMore by Jacob M. Ogorek
- John F. DeWildJohn F. DeWildUpper Midwest Water Science Center, USGS Mercury Research Laboratory, U.S. Geological Survey, 8505 Research Way, Middleton, Wisconsin 53562, United StatesMore by John F. DeWild
- Benjamin D. PetersonBenjamin D. PetersonEnvironmental Chemistry and Technology Program, University of Wisconsin−Madison, 660 North Park Street, Madison, Wisconsin 53706, United StatesMore by Benjamin D. Peterson
- James P. HurleyJames P. HurleyEnvironmental Chemistry and Technology Program, University of Wisconsin−Madison, 660 North Park Street, Madison, Wisconsin 53706, United StatesUniversity of Wisconsin Aquatic Sciences Center, 1975 Willow Drive, Madison, Wisconsin 53706, United StatesMore by James P. Hurley
- David P. KrabbenhoftDavid P. KrabbenhoftUpper Midwest Water Science Center, USGS Mercury Research Laboratory, U.S. Geological Survey, 8505 Research Way, Middleton, Wisconsin 53562, United StatesMore by David P. Krabbenhoft
Abstract

Atmospheric delivery of mercury (Hg) is important to the Upper Great Lakes, and understanding gaseous Hg exchange between surface water and air is critical to predicting the effects of declining mercury emissions. Speciated atmospheric Hg, dissolved gaseous Hg (DGM), and particulate and filter passing total Hg were measured on a cruise in Lake Michigan. Low mercury levels reflected pristine background conditions, especially in offshore regions. In the atmosphere, reactive and particle-associated fractions were low (1.0 ± 0.5%) compared to gaseous elemental Hg (1.34 ± 0.14 ng m–3) and were elevated in the urbanized southern basin. DGM was supersaturated, ranging from 17.5 ± 4.8 pg L–1 (330 ± 80%) in the main lake to 33.2 ± 2.4 pg L–1 (730 ± 70%) in Green Bay. Diel cycling of surface DGM showed strong Hg efflux during the day due to increased winds, and build-up at night from continued DGM production. Epilimnetic DGM is formed from photochemical reduction, while hypolimnetic DGM originates from biological Hg reduction. We found that DGM concentrations were greatest below the thermocline (30.8 ± 13.6 pg L–1), accounting for 68–92% of the total DGM in Lake Michigan, highlighting the importance of nonphotochemical reduction in deep stratified lakes.
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