1. Brief evaluation of REMAD and CMAQ for east Texas tracers Mark Green, DRI Model results from Christian Seigneur and Betty Pun- AER (CMAQ and REMSAD), and Mike Barna- CIRA (REMSAD)

2. Methodology Evaluation used 6-hour tracer data and model predictions for two 10-day periods where tracer data was sequestered: August 15-25, 1999; October 5-15, 1999

4. BRAVO Study Tracer Release & Monitoring Locations

5. CMAQ

6. August- Particulate S and observed iPPCH Northeast Texas tracer and Observed S Northeast Texas tracer Observed S

7. 12km CMAQ and 36km REMSAD NE Texas tracer obs/preds time series for sequestered period August- CMAQ and observed iPPCH Look at CMAQ first…Obs Preds

8. 12km CMAQ and 36km REMSAD NE Texas tracer obs/preds time series for sequestered period August- REMSAD and observed iPPCH Now REMSAD…Obs Preds

9. Tracer Release from Big Brown, 22-Aug-1999 00:00 GMT CMAQ-12kmREMSAD-36km

10. CMAQ 36 km Obs

11. From AER

12. Model performance summary statistics – Northeast Texas tracer, August episode

13. Model performance summary statistics – Eagle Pass tracer, August episode

14. October- Particulate S and observed PTCH Houston tracer and observed S Houston tracer Observed S

15. 12km CMAQ and 36km REMSAD Houston tracer obs/preds time series for sequestered period October- CMAQ and observed PTCH Look at CMAQ first… Obs Preds

16. October- REMSAD and observed PTCH 12km CMAQ and 36km REMSAD Houston tracer obs/preds time series for sequestered period Now REMSAD… Obs Preds

17. CMAQ 12 and 4 km simulation PTCH (Houston Tracer) October 12 6-hour average starting 19 GMT 22 GMT

18. REMSAD PTCH 36 km 12 km REMSAD vs. CMAQ 36 km vs. 12 km PTCH (Houston Tracer) October 12

19. CMAQ 36 km Obs

20. From AER

21. AER summary of CMAQ tracer transport In the 36 km simulations, tracer plumes still miss monitoring sites at and near Big Bend on some days In both the 36 and 4 km simulations for August, the PPCH plumes are too far East In both the 36 and 4 km simulations for October, the PTCH plumes are too far South 36 km simulations bring plume a lot closer to Big Bend than 4 km simulations

22. Model performance summary statistics – northeast Texas tracer, August episode

23. Model performance summary statistics – Eagle Pass tracer, October episode

24. SO4 at K-BAR, July-October 1999

25. Total Sulfur at K-BAR, July-October 1999

26. From AER