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CRGAQS: CAMx PSAT Results

This presentation recaps the recommendations from the previous call, describes the latest CAMx simulation, and discusses the use of PSAT on the August 2004 Base Year scenario. It also outlines the next steps for the study.

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CRGAQS: CAMx PSAT Results

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  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

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

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