1 / 54

Results of URM Runs with Updated Stack Parameters and Corrected Secondary Organic Aerosols

Results of URM Runs with Updated Stack Parameters and Corrected Secondary Organic Aerosols. Talat Odman, James Boylan, James Wilkinson, Ted Russell. Outline. URM Modeling Run for the July 1995 Episode with Updated Stack Parameters and Corrected Secondary Organic Aerosols

dorjan
Download Presentation

Results of URM Runs with Updated Stack Parameters and Corrected Secondary Organic Aerosols

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. Results of URM Runs with Updated Stack Parameters and Corrected Secondary Organic Aerosols Talat Odman, James Boylan, James Wilkinson, Ted Russell Georgia Institute of Technology

  2. Outline • URM Modeling Run for the July 1995 Episode with Updated Stack Parameters and Corrected Secondary Organic Aerosols • Updated Results vs. Old Results • Performance Evaluation • URM Model Results for the July 2010 Episode • 1995 vs. 2010 OTW • Status of Other SAMI Episodes • Conclusions Georgia Institute of Technology

  3. Updated July 1995 Episode • Corrected Stack Parameters in Emission Files • Most changes in Tennessee and Kentucky • Corrected Organic Aerosols • Secondary Formation was not properly treated • Changes in organic aerosols, PM2.5, and PM10 Georgia Institute of Technology

  4. Maximum Ozone on July 11, 1995 Georgia Institute of Technology

  5. Maximum Ozone on July 13, 1995 Georgia Institute of Technology

  6. Maximum Ozone on July 15, 1995 Georgia Institute of Technology

  7. Maximum Ozone on July 18, 1995 Georgia Institute of Technology

  8. Ozone Performance Georgia Institute of Technology

  9. Fine Sulfate on July 12, 1995 Georgia Institute of Technology

  10. Fine Sulfate on July 15, 1995 Georgia Institute of Technology

  11. Fine Nitrate on July 12, 1995 Georgia Institute of Technology

  12. Fine Nitrate on July 15, 1995 Georgia Institute of Technology

  13. Fine Organics on July 15, 1995 Georgia Institute of Technology

  14. Fine Sulfate Performance Georgia Institute of Technology

  15. Fine Nitrate Performance Georgia Institute of Technology

  16. Fine Ammonium Performance Georgia Institute of Technology

  17. Fine Organics Performance Georgia Institute of Technology

  18. Fine Elemental Carbon Performance Georgia Institute of Technology

  19. Fine Soils Performance Georgia Institute of Technology

  20. PM 2.5 Performance Georgia Institute of Technology

  21. PM 10 Performance Georgia Institute of Technology

  22. Coarse PM Performance Georgia Institute of Technology

  23. Fine Sulfate Georgia Institute of Technology

  24. Fine Organics Georgia Institute of Technology

  25. PM 2.5 Georgia Institute of Technology

  26. PM 10 Georgia Institute of Technology

  27. July 2010 Episode • NOx emissions decreased by 39% • NO and NO2 initial conditions decreased by 39% • SO2 emissions decreased by 32% • SO2, SO4, and NH4 initial conditions decreased by 32% Georgia Institute of Technology

  28. Daily Maximum Ozone on July 15 Georgia Institute of Technology

  29. Daily Average Sulfate on July 15 Georgia Institute of Technology

  30. Daily Average Nitrate on July 15 Georgia Institute of Technology

  31. Daily Average PM 2.5 on July 15 Georgia Institute of Technology

  32. Ozone at GSM Georgia Institute of Technology

  33. Ozone at Shenandoah Georgia Institute of Technology

  34. Georgia Institute of Technology

  35. Georgia Institute of Technology

  36. Georgia Institute of Technology

  37. Georgia Institute of Technology

  38. Georgia Institute of Technology

  39. Status of SAMI Runs Georgia Institute of Technology

  40. Conclusions • The corrections to the stack parameters do not show a significant impact on GSM or SHEN. • The corrections to the stack parameters can have a significant impacts on some areas of the Appalachian Mountains (KY, TN, VA, AL). • The correction to the secondary organic aerosols makes a significant impact everywhere in the domain. • Improved model performance for organics, PM2.5, and PM10. • Sulfate and ozone decreased in July 2010. However, nitrate has increased. Georgia Institute of Technology

  41. The Effect of Cations on the Heterogeneous Sulfate Production Georgia Institute of Technology

  42. Introduction • Wet deposition modeling results show ammonium, calcium, and magnesium mass fluxes to be higher than observed and hydrogen mass fluxes to be lower than observed. • S(IV) ==> S(VI) Heterogeneous Pathways • SO2 + H2O2 ==> sulfate • dominant at pH < 5.5 • SO2 + O3 ==> sulfate • dominant at pH > 5.5 • pH = - log[H] Georgia Institute of Technology

  43. July ‘95 Episode Georgia Institute of Technology

  44. May ‘95 Episode Georgia Institute of Technology

  45. May ‘93 Episode Georgia Institute of Technology

  46. February ‘94 Episode Georgia Institute of Technology

  47. March ‘93 Episode Georgia Institute of Technology

  48. Cation Contributions to Acidity • When representing acidity-related measurements, mass concentrations (g/L) are converted to units of equivalents per liters (eq/L) • meq/L = [mg/L] * valence /MW • NH4 (meq/L) = [NH4]/18 • H (meq/L) = [H] • Ca (meq/L) = [Ca]*2/40 • Mg (meq/L) = [Mg]*2/24 Georgia Institute of Technology

  49. July ‘95 Episode Georgia Institute of Technology

  50. May ‘95 Episode Georgia Institute of Technology

More Related