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Current Mercury Monitoring Approaches in Tribal Country

Current Mercury Monitoring Approaches in Tribal Country. David Gay NADP Program Office, dgay@uiuc.edu, http://nadp.sws.uiuc.edu, (217) 244-0462. What Can Be Measured? . Mercury Cycle. Deposition is a very good starting point!. It is the starting place of Hg moving into the biosphere;

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Current Mercury Monitoring Approaches in Tribal Country

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  1. Current Mercury Monitoring Approaches in Tribal Country David Gay NADP Program Office, dgay@uiuc.edu, http://nadp.sws.uiuc.edu, (217) 244-0462

  2. What Can Be Measured? Mercury Cycle

  3. Deposition is a very good starting point! • It is the starting place of Hg moving into the biosphere; • It is rather simple, • Straightforward • Inexpensive • Little training or experience needed.

  4. Dry Deposition Wet Deposition Bacterial action (water and sediment) predatoryfish Bioaccumulation of Methyl Mercury Through Fall (wet+dry) Geologic Sources (soil, rock, base flow etc.) Litter Fall Hg Hg Hg Me-Mercury Concentration Methylation Small fish Zooplankton Water Body/pore water

  5. Oxidation (long lifetime) How Mercury is Wet Deposited? Hgp RGM RGM Hgo Hgo Hgp rainout Hgp RGM washout

  6. Wet deposition Mercury sample

  7. Tribal Lands and Mercury Sources

  8. What is the NADP?

  9. A Cooperative Research Program (Un. Of Illinois) • Measure wet deposition, dry deposition & litterfall concentrations of mercury • North America • Taiwan, Mexico, South America • Owned and operated by our members • Decisions made by our members • Started in 1978, 35th year • Over 400,000 precipitation samples

  10. dry wet

  11. Wet Deposition

  12. Mercury Deposition Network (MDN) Collects one-week precipitation-only samples with MDN wet-dry collector Measures precipitation with gage Analyses Total Mercury Methyl Mercury Other options

  13. Typical Wet Deposition Site (MDN)

  14. Wet Deposition Collection

  15. Brief Look at Frontier Geosciences, Analytical Laboratory

  16. Dry Deposition

  17. dry wet

  18. Global Mercury Observation System (GMOS)

  19. Atmospheric Mercury Network (AMNet) • A New NADP Network • Measure: • Hg species (Tekran system) • meteorology and land cover variables • Elemental mercury (Hg0) • Gaseous oxidized mercury (GOM) • Particulate bound mercury (PBM) • Estimate Dry Deposition

  20. Coming Soon: Dry Deposition Estimates • flux (F ) = air concentration x dry deposition velocity (Vd) • F= Vdeposition * Concentrationair • where: • Ra as aerodynamic resistance, Rb as quasi-laminar resistance, and Rc as canopy resistance

  21. Product • Weekly estimates of dry deposition of • GOM • PBM2.5 • To align with weekly wet deposition values • (wet + dry ~ total) • Downward dry deposition of GEM • Working & coming soon • No evasion estimate (re-emission) • Not net deposition

  22. New Trial Network, Litterfall Mercury

  23. Results And what can be done with this information

  24. New NADP Trial Network: Mercury Litterfall • Started in 2012 • In cooperation with USGS • and USGS Mercury Research Lab • 14 stations (w/MDN) • Monthly observations • (May to Nov)

  25. Network Cost

  26. What Are People Doings with Our data?

  27. What factors are affecting fish concentrations of Hg? Water pH Total dissolved solids Dissolved sulfate Hg is overwhelmingly deposition Overwhelmingly anthropogenic Wiener et al., 2006 Environmental Science and Technology Vol40 p 6261.

  28. Mercury in Human Hair, By Region

  29. Mercury Deposition Higher in Urban Areas

  30. Gold Mining Locations important to Western Sites

  31. Typical Mercury Concentrations in Fish

  32. Trends In Precipitation Concentration

  33. Questions and Answers

  34. Current Mercury Monitoring Approaches in Tribal Country David Gay NADP Program Office, dgay@uiuc.edu, http://nadp.sws.uiuc.edu, (217) 244-0462

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