1. CAMx-PSAT Source Apportionment Modeling 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
ICON
Initial conditions
BCON
Boundary conditions PT
Point sources MV
Mobile sources
ANF
WRAP anthropogenic fires
Natural
WRAP natural fires and biogenics
NWF
Elevated fires in other RPOs AR
All other sources (non-elevated fires in other RPOs, area sources, offshore, oil & gas area sources, etc.)
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)

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

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

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

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

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

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

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

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

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

19. 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.

20. For More Information Modeling results available at:
WRAP Technical Support System
WRAP Regional Modeling Center