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Model Performance Zone Discussion

Explore the concept of Model Performance Zones as a solution to achieve optimal model performance in specific regions without compromising overall accuracy. This discussion covers zone options, issues, and the use of original and proposed zones.

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Model Performance Zone Discussion

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  1. Model Performance Zone Discussion Discussion Leader: Jeff Underhill NHDES Inter-RPO Modeling Meeting Denver, CO May 25-26, 2004

  2. Why Model Performance Zones? • It’s a huge task to ask the models to perform optimally on a national basis for a period of 365 days • Some of the model performance results presented so far may be compromised to some degree by regions of poor performance • Some of those areas may not be critical to the success of the modeling effort

  3. Model Performance Zones • Model Performance Zones are designed to ease the application of achieving sufficient model performance in discrete portions of the modeling domain without (yet) taking-on the task of optimal performance in all locations at all times. • Zones should be considered for large-scale regional haze, ozone, and PM modeling as well as for corresponding meteorological modeling.

  4. Options for Zones • None – require optimal performance everywhere and at all times • State-by-state • By RPO • By Class I areas or nonattainment areas • By common airsheds

  5. Issues • Option for focusing performance during critical periods • Codes to be developed to automate the application of performance zones • How should targeting performance in one area be resolved with performance in other areas? • Targeted performance for local zones at the expense of other zones may lead to result disagreement between RPOs

  6. Original Zones Used by WRAP

  7. Original Proposal for National Zones

  8. Original Revised by CENRAP

  9. DRI Zones for Haze

  10. IMPROVE Monitor Clusters

  11. Proposed Merged Concept

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