1. CRGAQS: CAMx PSAT Results
Presentation to the
Gorge Study Technical Team By
ENVIRON International Corporation
January 10, 2007

2. Today’s Presentation Recap recommendations from last call
Describe latest CAMx simulation
Use of PSAT on the August 2004 Base Year scenario
Next Steps

3. Recap Recommendations from last call: Focus on August episode
Run 2018 Case
Run PSAT for 2004
Run 5 “What-if” scenarios for 2018
Use model trends in relative sense to scale IMPROVE observations
Relegate November episode
Revisit with possible follow-on funding?

4. PM Source Apportionment Technology
What is PSAT?
Emissions of PM and gas precursors are stratified by source category and by source region
Tracers are used to tag emissions from each category-region pair and to track their transport, chemical evolution, and fate

5. PM Source Apportionment Technology
Tracers are run for species groups:
Sulfur (SO2 and PSO4)
Nitrogen (NOx, NOy, nitric acid, ammonia, PNO3, and PNH4)
Organics (VOC, condensable hydrocarbon products, and SOA components)
Primary PM (carbonaceous, fine/coarse dust, and fine/coarse other PM)

6. PSAT for August 2004 Base Case
Quantify source attribution at Mt Zion and Wishram
12 source categories by 6 source regions
10 source categories + IC + BC
Region 6 handles all emissions outside the 4-km grid
Sulfur, nitrogen, and primary PM groups
Organics: let core model report biogenic vs. anthropogenic apportionment

7. PSAT for August 2004 Base Case

8. PSAT for August 2004 Base Case
Source categories:
On-road mobile sources
Non-road mobile sources
Ammonia sources
Other area sources
Electric generating units (EGU)
Pulp mills
Wildfires
Other fires
Other point sources
All emissions outside the 4-km grid

9. PSAT for August 2004 Base Case
6x10 category/region matrix + IC/BC = 62 unique tracers
Sulfur (2 species), Nitrogen (7 species), primary PM (6 species) for each tracer
Total = 930 total tracers in PSAT
To “fit” the model into memory:
Run only the 4- and 12-km grids
36-km grid results used to extract 12-km BC’s
10-day spin-up was not run for PSAT
12-km 3-D concentration fields on August 10 used as IC’s

10. PSAT for August 2004 Base Case
PSAT results were post-processed for two monitoring sites along the Columbia River:
Mt Zion, and Wishram
Report results for the episode-average source apportionment (August 10-22)
Tables presented for “top” ranked emission category-region pairings
Represent 90%+ mass concentrations for each species

31. Next Steps Continue with 2018 Future Year scenario
August 2004 episode only
Continue with 5 “what-if” scenarios
Determine visibility trend lines
Document in project report