Transboundary ManMade Impacts at Class I Areas

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Transboundary Man-Made Impacts at Class I Areas

• Jim Boylan
• Georgia Department of Natural Resources
• VISTAS Joint Work Group MeetingDurham,
  NCSeptember 22, 2005

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GEOS-CHEM Simulations

• Harvard performed three GEOS-CHEM runs
• Run 1 Basecase with all emissions (MPE BCs)
• Run 2 Sensitivity with no U.S. anthropogenic
  emissions
• Run 3 Sensitivity with no global anthropogenic
  emissions (natural conditions)
• Transboundary Man-Made Impacts at Class I Areas
  calculated by (Conc. from Run 2) (Conc.
  from Run 3)
• Modeling performed for VISTAS and EPRI

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GEOS-CHEM Simulations

• VISTAS Runs
• 4 x 5 Grid Resolution
• 2002 Meteorology
• 2002 Biomass burning emissions inventory
• Original EPRI Runs (OLD)
• 1 x 1 Grid Resolution
• 2001 Meteorology
• 2001 Biomass burning emissions inventory
• Revised EPRI Runs (NEW)
• Canadian emissions reduced by 30
• New 1 x 1 grid definition better distinguishes
  U.S. and Canadian emissions

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Original 1 x 1 GEOS-CHEM Grid
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Updated 1 x 1 GEOS-CHEM Grid
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Ammonium Sulfate
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Ammonium Nitrate
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Organic Carbon Mass
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Elemental Carbon
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Dry Light Extinction (New EPRI)
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Dry Light Extinction (New EPRI)
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Dry Light Extinction (New EPRI)
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VISTAS CMAQ Modeling

• VISTAS will perform two annual CMAQ simulation on
  their 36 km grid
• Run 1 Basecase with all emissions (MPE)
• 2018 OTW BaseF Emissions (latest inventory)
• 36 km BCs from GEOS-CHEM to account for transport
  from outside North America
• Run 2 Sensitivity with clean BCs and Mexican
  and Canadian anthropogenic emissions removed.
• Assume all fires outside U.S. are natural
• Transboundary Man-Made Impacts at each Class I
  Areas calculated by (Conc. from Run 1)
  (Conc. from Run 2)

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VISTAS 36 km Grid