1 / 21

A New Version of CMAQ-MADRID and Comparison with CMAQ

Explore the features of the new CMAQ-MADRID versions, improvements in computational speed and PM representation, and a case study comparison with CMAQ. Enhance your air quality modeling experience with the latest advancements.

oclark
Download Presentation

A New Version of CMAQ-MADRID and Comparison with CMAQ

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  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

More Related