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CMAQ 4.5 and 4.4 Comparison. August 6 – 16, 2002 episode 217 ozone monitoring sites in OTR The response from the CAIR 2010 control plus 50% VOC reduction within OTR PM comparison - TEOM hourly PM 2.5 measurements - STN speciated data. Scatter plot. - PowerPoint PPT Presentation
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CMAQ 4.5 and 4.4 Comparison
• August 6 – 16, 2002 episode• 217 ozone monitoring sites in OTR• The response from the CAIR 2010 control
plus 50% VOC reduction within OTR• PM comparison - TEOM hourly PM 2.5 measurements - STN speciated data
Scatter plot
Statistics: 8-Hour Daily Max Ozone
CMAQ V4.4 CMAQ v4.5
Mean Bias -11.93 -8.19
Mean Absolute Gross Error
16.11 13.40
RMSE 19.65 16.84
Mean Normalized Bias
-13.16% -7.51%
R 0.71 0.74
Ratio of CAIR 2010+50VOCOTR Control to 2002 Base (above 60 ppb)
Daily Averaged PM2.5
Diurnal Variation PM2.5
STN PM2.5
STN SO4
STN NO3
STN NH4
EC at STN
OC at STN
Summary• CMAQ 4.5 predicted higher 8-hour ozone
concentration than CMAQ 4.4.• CMAQ 4.5 response to emission reduction
more sensitive than CMAQ 4.4 in this August 2002 episode.
• CMAQ 4.5 predicted lower PM2.5 concentration than CMAQ 4.4.
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