CCOS 2000 Model Intercomparison: Diagnostic Analyses. Gail Tonnesen, Zion Wang, Mohammad Omary, Bo Wang University of California, Riverside Bourns College of Engineering Center for Environmental Research and Technology. January 27 2002, Progress Report to CARB.
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CCOS 2000 Model Intercomparison:Diagnostic Analyses
Gail Tonnesen, Zion Wang,
Mohammad Omary, Bo Wang
University of California, Riverside
Bourns College of Engineering
Center for Environmental Research and Technology
January 27 2002, Progress Report to CARB
Integrated reaction rates (IRR) show chemical production and loss in the grid cell where the species reacted.
Results shown here as total ppb/day
Integrated Process Rates (IPR) show transport, dispersion, emissions, deposition.
Have not looked at these terms yet.Process Analysis Outputs for CAMx
Total reactivity P(Ox) = P(O3) and oxidation of NO.
Radical budget controls P(O3) and sensitivity in urban areas:
Radical propagation and termination
NOy budget controls P(O3) and O3 sensitivity in rural areas:
Conversion of NOx to Inert HNO3, RNO3, PAN.Chemical Process Analysis for CAMx
SAPRC99 has greater organic radical production and lower OH+NO2 radical termination.
SAPRC99 produces more O3 in urban areas and less in rural areas.
Consistent with box model comparisons.
Next several plots compare P(Ox) reactivity in CAMx CB4 and SAPRC99 and also show day to day variability in reactivity.CAMx CB4 vs SAPRC99 reactivity
Calculated extent using ambient data as average of measured NOx = NO+NO2 and measured NOx = NOy.
Calculated model extent as NOx=NO+NO2.
Poor agreement between models and data.
Need to further evaluate this.Extent Parameter
Comparsions of CO as a relatively inert tracer NOx = NO+NO2 and measured NOx = NOy.
Sensitivity run with met pass through for CMAQEvaluate Vertical Mixing
Hypothesis: Difference in vertical dispersion
CO Conc plots do not appear to support this.
Need to further investigate.Model CO Conc Differences
Model CO at 8:00 PDT the day.
Model CO N-S Slice at 8:00 PDT the day.
Pass through of MM5 MRF Met data
Continue to investigate CMAQ
Meteorology and vertical mixing, h-diffusion
Updated N2O5 HNO3 with aerosols
Additional CMAQ runs well be useful for corrobatory analysis.
Run both models again if there are substantial changes in emissions.Recommendations
Next Steps modeling.