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Atmospheric Mercury Deposition to Lake Michigan During the Lake Michigan Mass Balance Study

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Abstract: Wet and dry mercury (Hg) deposition were calculated to Lake Michigan using a hybrid receptor modeling framework. The model utilized mercury monitoring data collected during the Lake Michigan Mass Balance Study and the Atmospheric Exchange Over Lakes and Oceans Study together with high-resolution over-water meteorological data provided by the National Oceanic and Atmospheric Administration (July, 1994 - October, 1995). Atmospheric deposition was determined to be the primary pathway for mercury input to Lake Michigan, contributing approximately 84% of the estimated 1403 kg total annual input (atmospheric deposition + tributary input). Wet (10.6 ug m-2) and dry deposition (9.7 ug m-2) contributed almost equally to the annual atmospheric Hg deposition of 20.3 ug m-2 (1173 kg). Reemission of dissolved gaseous Hg from the lake was also significant (7.8 ug m-2), reducing the net atmospheric deposition to 12.5 ug m-2 (720 kg). A strong urban influence was observed in the over-water mercury deposition estimates in the southern portion of the lake. The Chicago/Gary urban area was estimated to contribute approximately 20% (127 kg) of the annual atmospheric mercury deposition to Lake Michigan. The magnitude of local anthropogenic mercury sources in the Chicago/Gary urban area suggests that emission reductions could significantly reduce atmospheric mercury deposition into Lake Michigan.

The U.S. Environmental Protection Agency through its Great Lakes National Program Office (Grants GL985742-01-1 and GL 985430-01-2) funded the research described here under to the University of Michigan Air Quality Laboratory (UMAQL). 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:Landis, M. S., and G. J. Keeler. Atmospheric Mercury Deposition to Lake Michigan During the Lake Michigan Mass Balance Study. ENVIRONMENTAL SCIENCE & TECHNOLOGY 36(21):4518-4524, (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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