Use of passive sampling methods to understand sources of mercury to high elevation sites in the Western United States Jiaoyan Huang Mae S. Gustin.

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Presentation transcript:

Use of passive sampling methods to understand sources of mercury to high elevation sites in the Western United States Jiaoyan Huang Mae S. Gustin

Acknowledgement  Undergraduate students at UNR Matthew Peckham, Douglas Yan, Travis Lyman, Musheng Alishahi, and Jennifer Arnold  The site operators Jeff Morris (BISP), Cody Tingey (CGSP), Tim Forsell (CCRS), Russ Merle (PRMP), Jerry Dries (ECHO), Daren Winkelman (AGPK), and Li Zhang (AGPK), Tony Lesperance (PAVA), Ben Roberts (GBNP), and Peter Weiss-Penzias (CHALK)

Methods

Sampling sites

Different materials and exposure times polysulfone membranes, ICE 450 polyethersulfone membrane, Mustang S

Correlations

Spatial and temporal variation

Modeled and measured results thorn shrubs sites

Probability function domain

Source regions  AGPK  LA and MBL boxes-high elevation  LA, Las Vegas, MBL, and San Joaquin Valley low elevation.  PEAV  SF all elevations  LA less points

Asian long range transport

Summary  Hg amount collected on Mustang S is comparable that on ICE 450.  Hg dry deposition was higher at high elevation sites than at low elevation sites.  Dry deposition uncertainties are still high and different GOM species were observed.  Regional and long range transport sources affect Hg level at high elevation sites in the Western US.

The Influence of a Local Coal-Fired Power Plant on Ambient Mercury Concentrations Jiaoyan Huang Yungang Wang Philip K. Hopke Thomas M. Holsen

S ITE M AP

I NSTRUMENTS  Tekran® 2537/1130/1135  Trace gases instruments (CO, ozone, SO 2 )  Scanning mobility particle sizer differential mobility analyzer 85 Kr aerosol neutralizer Condensation particle counter  PM 2.5 : tapered element oscillating microbalance (TEOM)  Two-wavelength aethalometer

P OSITIVE M ATRIX F ACTORIZATION A weighted factorization problem with non-negativity constraints using known experimental uncertainties as input data thereby allowing individual treatment (scaling) of matrix elements

A MBIENT A IR H G C ONCENTRATION D OWNWIND I NFLUENCES Significantly higher before than after the CFPP closure

PMF R ESULTS

CFPP C ONTRIBUTION

C ONDITIONAL P ROBABILITY F UNCTION black line: before the CFPP closure red line: after the CFPP closure

R EACTIVE H G P ARTITIONING C OEFFICIENT Time periodslopeinterceptr2r2 K p (m 3 /μg) Overall ± ± , p< ± /7/2007-4/24/ ± ± , p< ± /7/2008-4/24/ ± ± , p< ± 6.7 4/25/ /6/ ± ± , p< ± 1.3 4/25/ /6/ ± ± , p< ± 4.0 Partitioning coefficient significantly changed after the CFPP closure

S UMMARY  A significant reduction of three Hg concentrations after the CFPP closure  PMF results indicates a low contribution of three Hg forms for the CFPP factor after shutdown  CPF results also show the low contribution from the CFPP location after shutdown  A significant change of reactive Hg gas-particle partitioning coefficient

A CKNOWLEDGEMENTS  New York State Energy Research and Development Authority (NYSERDA)  United States Environmental Protection Agency (US EPA) through Science to Achieve Results (STAR)  US EPA Atmospheric Clean Air Markets Division and NADP Hg Monitoring Network  Syracuse Center of Excellence Collaborative Activities for Research and Technology Innovation (CARTI)  New York State Department of Environmental Conservation

R EFERENCES  Effect of the shutdown of a large coal-fired power plant on ambient mercury species Y Wang, J Huang, PK Hopke, OV Rattigan, DC Chalupa, MJ Utell,... Chemosphere 92 (4), Effect of the shutdown of a large coal-fired power plant on ambient mercury species  Ambient mercury sources in Rochester, NY: results from principle components analysis (PCA) of mercury monitoring network data J Huang, HD Choi, PK Hopke, TM Holsen Environmental science & technology 44 (22), Ambient mercury sources in Rochester, NY: results from principle components analysis (PCA) of mercury monitoring network data Q UESTIONS ??