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WRAP Regional Modeling Assessment for Ozone John Vimont.

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Presentation on theme: "WRAP Regional Modeling Assessment for Ozone John Vimont."— Presentation transcript:

1 WRAP Regional Modeling Assessment for Ozone John Vimont

2 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

3 Chemical Mechanisms Original WRAP runs used CB4 –Not considered as appropriate as others for regional modeling –Tuned toward hi-NO X in urban areas WRAP looking at sensitivity of newer chemical mechanisms –SAPRC99 & CB4-2000

4 SAPRC99 vs. CB4 O3; AQS FE%FB% SAPRC CB CB cross comparisons

5 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

6 How Best To Use WRAP O 3 ? Evaluate secondary effects of PM strategies Evaluate potential source areas for elevated O 3 levels Use as tool for EIS work – already set up as cumulative analysis tool –Will development increase O 3 ? Use as boundary for 1-way nests for urban-scale analyses –Denver’s how much coming from outside area

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