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A New Version of CMAQ-MADRID and Comparison with CMAQ

A New Version of CMAQ-MADRID and Comparison with CMAQ. Christian Seigneur, Betty Pun, Prakash Karamchandani, Krish Vijayaraghavan, and Shu-Yun Chen AER San Ramon, California Eladio Knipping and Naresh Kumar EPRI Palo Alto, California. CMAQ-MADRID. CMAQ-MADRID 1

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A New Version of CMAQ-MADRID and Comparison with CMAQ

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  1. A New Version of CMAQ-MADRID and Comparison with CMAQ Christian Seigneur, Betty Pun, Prakash Karamchandani, Krish Vijayaraghavan, and Shu-Yun Chen AER San Ramon, California Eladio Knipping and Naresh Kumar EPRI Palo Alto, California

  2. CMAQ-MADRID • CMAQ-MADRID 1 • operational version (e.g., BRAVO) • CMAQ-MADRID 2 • research-grade version • Both versions currently available from CMAS

  3. CMAQ-MADRID 1 vs. CMAQ CMAQ Modal representation of PM 6 SOA precursors No explicit heterogeneous reactions CMAQ-MADRID Sectional representation of PM 14 SOA precursors Heterogeneous reactions

  4. CMAQ-MADRID 1 Computational Assessment July 2002 version Total CPU time = 26.3 ms grid cell-1 hr -1 AMD Athlon MP 2100+

  5. CMAQImprovement in Transport Calculations September 2003 version July 2002 version Total CPU time = 7.9 ms grid cell-1 hr -1 AMD Athlon MP 2100+ Total CPU time = 2.2 ms grid cell-1 hr -1 AMD Athlon MP 2100+

  6. Improvements inCMAQ-MADRID Computations • CMAQ 2003 version 4.3 • Reduction of the number of explicit SOA precursors from 14 to 8 • Gain in CPU time of about one order of magnitude • CMAQ-MADRID 1 is currently within 10% of CMAQ

  7. New Treatment of SOA inCMAQ-MADRID 1 Anthropogenic precursors: no changes Toluene Xylenes

  8. New Treatment of SOA inCMAQ-MADRID 1 Biogenic precursors: 12 6 Approach for optimization: Retain the precursors with significant emissions Group species according to precursor reactivity and SOA properties (molecular weight, structure & volatility)

  9. New Treatment of SOA inCMAQ-MADRID 1 a-Pinene APIN b-Pinene, D3-carene & sabinene BPIN Limonene LIM Terpinene TER Ocimene, linalool, terpineol & terpinolene OCI Humulene & caryophyllene HUM

  10. Example Simulation: CENRAPRegional Haze - Preliminary Base case • One-month simulation: July 2002 • Central and eastern United States • MM5 simulation by CENRAP • SMOKE emissions by UNC (modified for CMAQ-MADRID by AER)

  11. PM2.5 (mg/m3)

  12. Sulfate (mg/m3)

  13. Nitrate (mg/m3)

  14. OM (mg/m3)

  15. SOA (mg/m3)

  16. Chemical Composition atBig Bend National Park, TX Observation 6.2 mg/m3 CMAQ MADRID 1 3.3 mg/m3 CMAQ original 2.5 mg/m3

  17. Chemical Composition atUpper Buffalo Wilderness Area, AK Observation 13.9 mg/m3 CMAQ MADRID 1 11.2 mg/m3 CMAQ original 8.5 mg/m3

  18. Chemical Composition atVoyageurs National Park, MN Observation 7.2 mg/m3 CMAQ Madrid1 6.8 mg/m3 CMAQ original 4.9 mg/m3

  19. Conclusion • CMAQ-MADRID 1 is now comparable in computational speed to CMAQ • CMAQ-MADRID 1 has a more detailed representation of biogenic SOA and leads to more SOA formation than CMAQ

  20. Next Steps • Incorporation of MADRID 1 and MADRID 2 into the forthcoming version of CMAQ (2004) • Transfer of CMAQ-MADRID 2004 to CMAS

  21. Acknowledgements • We are grateful to CENRAP for the use of the July 2002 model inputs

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