19. Dennis, R.,”Time-Resolved and In-Depth Evaluation of PM and PM Precursors Using

CMAQ ”, PM Model Performance Workshop, RTP, NC, 2004.

• Evaluated the CMAQ (2003 version) performance of inorganic PM, EC, and gaseous

precursors against Atlanta 1999 supersite summer data and 2002 Pittsburgh supersite

winter data.

• Suggested that collapse of evening PBL is too fast and rise of morning PBL too slow

(based on higher modeled EC, NOy & CO against Atlanta data at sunrise & sunset)

• Performance for sulfate & ammonium was fairly good;

• Overprediction for nitrate, but updated chemistry in CMAQ (included in 2004 version)

has improved the nitrate performance (updated reaction probability for HNO3

heterogeneous rxn and remove gaseous N2O5->HNO3 rxn)

• Use ratio to define nitrate PM formation being HNO3- or NH3-limited: (NHx251

2*SO4)/(HNO3+NO3)

• Nitrate PM predictions are very sensitive to NHx, and thus the NH3 emissions need

serious attention.

20. Kumar, N.,”PM2.5 Model Performance: Lessons Learned and Recommendations ”, PM

Model Performance Workshop, RTP, NC, 2004.

 

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