After confidence has been achieved in producing UAM input

fields, the UAM should be exercised for each base case

meteorological episode. The initial run is termed a diagnostic

simulation because review of initial base case simulations usually

uncovers additional input errors requiring correction before an

acceptable set of base case inputs can be derived. During this

stage of the process, emphasis is placed on assessing the model's

ability to correctly depict plume orientation and the timing of

observed ozone maxima. Accordingly, visual methods such as mapping

and time-series plotting, using measured data as reference marks,

may be used to assess model behavior.


To aid in interpreting simulation results, it is recommended

that predicted and observed ozone concentration maps be

constructed for each base meteorological episode simulation.

Concentration maps present spatial information on the

structure of the ozone plume.

Maps at 1- or 2-hour intervals should be constructed over the

periods of most interest. While a typical period might be

defined as early morning to late afternoon for the day of

highest ozone, it is also useful to look at most time

intervals under recirculation, stagnation, and transport




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