9. Morris. R., et al.,”Evaluation of CAMx: Issues Related to Section Models ”, PM Model

Performance Workshop,RTP, NC, 2004c.

• Illustrated a WRAP comparison of CMAQ (v4.3), REMSAD (v7), CAMx (bimodal

PM), and CAMx (4-section PM) based on January and July 1996 and annual 1996 over

the 36-km WRAP domain.

• Indicated that all models exhibited variations in performance, but no clear winner

across all species and periods. Sulfate predictions were reasonable, but nitrate was

significantly overpredicted. For all three models,

Sulfate : MFE = 40% ~ 60%, MFB = -40% ~ +14% (July 96)

Nitrate : MFE = 105% ~ 200%, MFB = +45% ~> +100% (Jan. 96)

Organic: MFE = 50% ~ 75%, MFB = -65% ~ +5% (July 96)

EC : MFE = 47% ~ 105%, MFB = -48% ~ +25% (Jan. 96)

• The 1996 model performance is less than stellar, indicating potential issues in 1996

MM5 and emissions.

• Showed the effects of sectional PM distribution on PM Modeling in the Western US.

Based on a study in the South Coast Air Basin using CAMx4+, which allows side-byside

comparisons of aqueous-phase chemistry modules (bulk vs. variable size

resolution) and of PM size distribution treatments (bimodal vs. sectional).

10. Tonnesen, G., et al..,”Model Performance Metrics, Ambient Data Sets and Evaluation

Tools”, PM Model Performance Workshop, RTP, NC, 2004a.

 

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