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Overview Mercury Deposition Network (MDN) in NC. Jim Bowyer, PhD NC Division of Air Quality Toxics Protection Branch Raleigh, NC. Mercury In the Atmosphere. Three types (species) Elemental Mercury vapor (Hg 0 ) - >98% of the mercury species in the air

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overview mercury deposition network mdn in nc

Overview Mercury Deposition Network (MDN) in NC

Jim Bowyer, PhD

NC Division of Air Quality

Toxics Protection Branch

Raleigh, NC

mercury in the atmosphere
Mercury In the Atmosphere

Three types (species)

Elemental Mercury vapor (Hg0)

- >98% of the mercury species in the air

- longest transport range, globally

Reactive Gaseous Mercury (RGM)

- divalent mercury (HgCl2)

- short range transport

Particulate Bound Mercury (PBM)

- short range transport

mercury deposition
Mercury Deposition

Dry deposition

Atmospheric transfer to surfaces during dry weather & occurs at all times to all surfaces.

Deposits all three types of atmospheric Hg.

Wet deposition – Atmospheric transfer to surfaces thru precipitation (rain, snow, etc)

Deposits all three but more readily water soluble RGM & PBM.

mercury deposition network
Mercury Deposition Network

Mercury wet-deposition monitoring arm of the National Atmospheric Deposition Program (NADP)

Begun in 1996

Provides a nationally consistent survey of mercury wet-deposition concentration & fluxes showing regional & international deposition patterns.

Identifies long-term pattern changes in wet-deposition rates over time and space.

Provides high-quality data for use in estimating wet deposition rates locally or between sites, and for current and future mercury policy and modeling efforts.

mdn sites
MDN Sites

Pettigrew

Candor

Elkmont (Great Smokies)

Waccamaw

field operations
Field Operations
  • Wet deposition sampling (rain water)
  • Weekly composite samples
  • Collected every Tuesday
  • Analyses at Frontier Geosciences, Bothell, WA
  • Data analysis by University of Illinois, Champaign
mdn total hg deposition seasonal
MDN Total Hg Deposition Seasonal

From MDN Brochure http://nadp.sws.uiuc.edu/lib/brochures/mdn.pdf

links to additional information
Links to Additional Information

Mercury Deposition Network Web Page http://nadp.sws.uiuc.edu/MDN/

http://nadp.sws.uiuc.edu/lib/brochures/mdn.pdf

NC Division Air Quality Mercury Information

http://daq.state.nc.us/quick/mercury/

National Atmospheric Deposition Program (NADP) Annual Reports

http://nadp.sws.uiuc.edu/lib/dataReports.aspx

questions
Questions

Contact Information

Jim Bowyer

NC DAQ, Chemist III

919-715-7484

[email protected]

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