7. Tonnesen, G., et al., “Regional Haze Modeling: Recent Modeling Results for VISTAS and

WRAP”, CMAS Annual workshop, RTP, NC, 2003.

• Illustrated the WRAP 1996 CMAQ 36-km modeling and performance evaluation in the

Western U.S. and VISTAS CMAQ 12-km modeling for 3 episodes: January 2002, July

1999, July 2001. Recommended to use the performance metrics of Mean Fractional

Bias (MFB)and Mean Fractional errors (MFE) over mean normalized bias & errors

(used in earlier WRAP model evaluation).

Sulfate: MFB = -47% ~ +48% (1996 WRAP domain)

Nitrate: MFB = -95% ~ +30% (1996 WRAP domain)

Organic: MFB = -20% ~ +70% (1996 WRAP domain)

OC: MFB = -45% ~ +3% (1996 WRAP domain)

• VISTAS modeling key findings (1) sulfate performance reasonably well (2) nitrate

overpredictions in the winter, underpredictions in summer, may need better NH3

emissions (3) Kv min =1 improved performance, mixing height is important (4) minor

differences in 19 vs. 34 layers

8. Zhang, Y., et al., “Performance Evaluation of CMAQ and PM-CAMx for July 1999 SOS

Episode”, AER Report for CRC, Doc# CP131-03-01, April 2003.

 

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