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Comparison of CMAQ and CAMx for an Annual Simulation over the South Coast Air Basin

Comparison of CMAQ and CAMx for an Annual Simulation over the South Coast Air Basin. Jin Lu 1 , Kathleen Fahey 1 , Bruce Jackson 1 , Paul Livingstone 1 , Daniel Chau 1 , and Ajith Kaduwela 1,2. 1 Planning and Technical Support Division Air Resources Board

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Comparison of CMAQ and CAMx for an Annual Simulation over the South Coast Air Basin

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  1. Comparison of CMAQ and CAMx for an Annual Simulation over the South Coast Air Basin Jin Lu1, Kathleen Fahey1, Bruce Jackson1, Paul Livingstone1, Daniel Chau1, and Ajith Kaduwela1,2 1Planning and Technical Support Division Air Resources Board California Environmental Protection Agency 2Department of Land, Air and Water Resources University of California at Davis 6th Annual CMAS Meeting

  2. DISCLAIMER The content of this presentation does not necessarily reflect the views and policies of the California Air Resources Board, nor does mention of trade names or commercial products constitute endorsement or recommendation for use. 6th Annual CMAS Meeting

  3. South Coast Air Basin One of the most polluted regions and the most studied region in the world. 6th Annual CMAS Meeting

  4. South Coast Air Basin 116×80 5 km2 grid cells 6th Annual CMAS Meeting

  5. Simulation Setup for 2005 • MM5 (South Coast AQMD) • Emissions – CARB/SCAQMD • Measurements: Rubidoux – Riverside (RUB) and Los Angeles (LA) • PM species concentrations: STN database PM2.5, NO3, SO4, NH4, OC, EC • Hourly gaseous species concentrations: AIRS/AQS database O3, CO, NO, NO2, SO2 • Model predictions • PM - 9 grid cells 24-hr average concentration • O3, - 1 grid cell hourly Meteorology 6th Annual CMAS Meeting

  6. Model Configuration CMAQ Version 4.6 vs. CAMx Version 4.2 6th Annual CMAS Meeting

  7. Species Mapping: CMAQ vs. CAMx 6th Annual CMAS Meeting

  8. Outline of Comparison and Analysis • Scatter Plots • CMAQ vs. Observation • CAMx vs. Observation • CMAQ vs. CAMx • PM species, annual plots at Rubidoux • O3, quarterly plots at Rubidoux • Box Plots • PM species, weekly • Gas species, 24-hour • Statistics FBIAS - Fractional Bias FERR Fractional Error NMB - Normalized Mean Bias NME Normalized Mean Error 6th Annual CMAS Meeting

  9. PM2.5 Scatter Plots 6th Annual CMAS Meeting

  10. PM2.5 Box Plots 6th Annual CMAS Meeting

  11. PM Species Scatter Plots 6th Annual CMAS Meeting

  12. O3 Scatter Plots 6th Annual CMAS Meeting

  13. O3 Box Plots 6th Annual CMAS Meeting

  14. Statistics – Gaseous Species 6th Annual CMAS Meeting

  15. Statistics – PM species 6th Annual CMAS Meeting

  16. Statistics at Rubidoux 6th Annual CMAS Meeting

  17. Conclusions • Annual simulations over South Coast Air Basin performed with both CMAQ and CAMx • CMAQ and CAMx model performance evaluated at Roubidoux and Los Angeles • Model predictions correlate well with each other • Model predictions correlate reasonably well with observations 6th Annual CMAS Meeting

  18. International Aerosol Modeling Algorithms (I AM A) Conference • Bi-annual in-depth look at the inner-workings of aerosol models (complements the annual CMAS Meeting) • Wednesday, December 5th – Friday, December 7th, 2007 (just before the AGU meeting in San Francisco) • University of California at Davis • Impressive list of U.S. and international invited speakers • Information at http://airquality.ucdavis.edu/ 6th Annual CMAS Meeting

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