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Deposition and Emission of Gaseous Mercury to and from Lake Michigan During the Lake Michigan Mass Balance Study (July, 1994 October, 1995)

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Abstract: This paper presents measurements of dissolved gaseous mercury (DGM) concentrations in Lake Michigan and the application of a mechanistic approach to estimate deposition and emission fluxes of gaseous mercury (Hg2+ and Hg0) to and from Lake Michigan. Measurements of DGM concentrations made during May and July, 1994 and January, 1995 indicate that Lake Michigan was supersaturated with DGM suggesting that transfer of Hg0 occurs from the water to the atmosphere. Over-water concentrations of gaseous Hg2+ were estimated from total gaseous Hg (TGM) concentrations measured at five sites in the basin and used to model dry deposition fluxes of Hg2+. The modeling approach combines estimates of dry deposited Hg2+ with known photochemical and biotic reduction rates to form Hg0, which is available for re-emission. The model accounts for temporal and spatial variations in the deposition velocity of gaseous Hg2+ and the transfer velocity of Hg0 using high temporal and spatial resolution meteorological data. The modeled DGM concentrations agree well with the observed DGM concentrations in Lake Michigan. The modeled dry deposition fluxes of Hg2+ (286-797 kg yr-1) are very similar to the emission fluxes of Hg0 (320-959 kg yr-1), depending on the gaseous Hg2+ concentration used in the model.

The U.S. Environmental Protection Agency through its Office of Research and Development funded the research described here under cooperative agreement # CR820909-01 and its Great Lakes National Programs Office under grant # GL995569-01 to the University of Michican Air Quality Laboratory. It has been subjected to Agency review and approved for publication. Mention of trade names or commercial products does not constitute an endorsement or recommendation for use.
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Citation:Vette, A. F., M. S. Landis, and G. J. Keeler. Deposition and Emission of Gaseous Mercury to and from Lake Michigan During the Lake Michigan Mass Balance Study (July, 1994 October, 1995). ENVIRONMENTAL SCIENCE & TECHNOLOGY 36(21):4525-4532, (2002).
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Contact: Liz Hope - (919) 541-2785 or hope.elizabeth@epa.gov
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Division: Human Exposure & Atmospheric Sciences Division
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Branch: Source Apportionment & Characterization Branch
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Product Type: Journal
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Published: 07/30/2002
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Related Entries:
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Bullet Item Atmospheric Mercury Research
spacer Relationship Reason:   A Project of the Product
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