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Regional Ozone Assessment for Visibility: Balancing Modeling Constraints

Explore the effectiveness of the WRAP Model in assessing ozone levels, focusing on how it impacts visibility across different grid resolutions. Evaluate chemical mechanisms like CB4 and SAPRC99 for accuracy in regional modeling, considering performance against NAAQS levels. Discover the potential of WRAP O3 as a tool for analyzing PM effects, identifying high O3 source areas, and predicting ozone increase due to development. Implement finer resolution for urban areas and boundary nests for detailed analyses. Enhance modeling sensitivity and cross-comparisons for improved regional air quality evaluation.

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Regional Ozone Assessment for Visibility: Balancing Modeling Constraints

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  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-NOX in urban areas • WRAP looking at sensitivity of newer chemical mechanisms • SAPRC99 & CB4-2000

  4. SAPRC99 vs. CB4 O3; AQS 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 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

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