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CAMx-PSAT Source Apportionment Modeling Results

This report summarizes the findings from the CAMx PSAT Source Apportionment Modeling conducted for stationary sources during the Joint Forum Meeting on November 14, 2006, in Tempe, AZ. The modeling tracks contributions of sulfate and nitrate from various sources, analyzing two cases: Plan 2002c and Base 2018b. It includes data on Colorado mobile sources, boundary conditions, and contributions from Canada, Mexico, and Pacific Ocean points. The results highlight the significant role of WRAP point sources in sulfate and nitrate levels, emphasizing the need for continued strategies to meet natural conditions beyond 2018.

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CAMx-PSAT Source Apportionment Modeling Results

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  1. CAMx-PSATSource ApportionmentModeling Results Stationary Sources Joint Forum Meeting November 14, 2006 Tempe, AZ

  2. Source Apportionment Technique • CAMx air quality model with PM Source Apportionment Technology (PSAT) • Tracks sources of sulfate and nitrate • PSAT completed for 2 cases: • Plan 2002c • Base 2018b

  3. 18 Source Regions on a 36 km Grid

  4. Eight Source Categories • Examples of PSAT “sources”: • MV_CO = mobile sources in Colorado • PT_CE = point sorces in CENRAP • BCON = transport from modeling domain boundaries (derived from GEOS-CHEM)

  5. Contribution of Colorado Mobile Sources to January 2002 Average NO3 Concentration

  6. Contribution of Colorado Mobile Sources to January 2018 Average NO3 Concentration

  7. Contribution of Boundary Conditions to August 2018 Average SO4 Concentration

  8. Contribution of Canada Point Sources to August 2018 Average SO4 Concentration

  9. Contribution of CENRAP Point Sources to August 2018 Average SO4 Concentration

  10. Contribution of Mexico Point Sources to August 2018 Average SO4 Concentration

  11. Contribution of Pacific Ocean Sources to August 2018 Average SO4 Concentration

  12. Contribution of Colorado Point Sources to August 2018 Average SO4 Concentration

  13. Contribution of Wyoming Point Sources to August 2018 Average SO4 Concentration

  14. Summary • WRAP point sources are a significant contributor to SO4 and NO3 at many Class I areas • However, reasonable progress towards meeting natural conditions, especially beyond 2018, will require additional strategies.

  15. For More Information • Modeling results available at: • WRAP Technical Support System • http://vista.cira.colostate.edu/tss/ • WRAP Regional Modeling Center • http://pah.cert.ucr.edu/rmc/

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