Overview mercury deposition network mdn in nc
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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

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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


Pettigrew nc 42

Pettigrew (NC 42)


Aerochem wet deposition rainwater collector

Aerochem Wet Deposition Rainwater Collector


Mercury wet deposition 2010

Mercury Wet Deposition 2010


Mdn hg concentration bimonthly averages

MDN Hg Concentration Bimonthly Averages


Mdn total hg deposition bimonthly totals

MDN Total Hg Deposition Bimonthly Totals


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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