WRAP Regional Modeling Assessment for Ozone
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Transcript of WRAP Regional Modeling Assessment for Ozone
WRAP Regional Modeling Assessment for Ozone
John Vimont
WRAP Modeling Constraints
• Focus on PM and how it affects visibility• Coarse Grids (36 or 12 km)• Ozone evaluated as indicator of
performance – doesn’t get NAAQS level of scrutiny
• CMAQ does 1-way nesting – may need finer resolution in urban areas to get effect beyond area
Chemical Mechanisms
• Original WRAP runs used CB4– Not considered as appropriate as others for
regional modeling
– Tuned toward hi-NOX in urban areas
• WRAP looking at sensitivity of newer chemical mechanisms– SAPRC99 & CB4-2000
SAPRC99 vs. CB4O3; AQS
FE% FB%
SAPRC99 49.0 -48.9
CB4 51.0 -50.9
CB4-2002 49.2 -49.1
cross comparisons
Difference?
• Very little difference in performance
• Should break out different geographic areas for further evaluation
• Fast solver for mechanism drives choice– Being implemented for other mechanisms
How Best To Use WRAP O3?
• Evaluate secondary effects of PM strategies• Evaluate potential source areas for elevated O3
levels• Use as tool for EIS work – already set up as
cumulative analysis tool– Will development increase O3?
• Use as boundary for 1-way nests for urban-scale analyses– Denver’s how much coming from outside area