wrap regional modeling assessment for ozone
DESCRIPTION
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 - PowerPoint PPT PresentationTRANSCRIPT
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