The diagnostic analyses described in this chapter are
considered to be a starting point for a specific modeling study.
Diagnostic tests discussed in Reference 17 should be considered
whenever possible. Also, the EPA is developing a UAM Postprocessing
System18 to assist in diagnostic testing of the base
meteorological episodes. Availability of this software will be
announced through the SCRAM BBS.
Diagnostic testing of the model should begin with quality
assurance testing on input data files (Section 4.1).
Diagnostic testing of each base meteorological episode should
follow (Section 4.2). Additional diagnostic sensitivity tests
for the base episode should also be considered (Section 4.3),
including using zero emissions and/or zero boundary conditions,
and varying mixing height and wind speed estimates.
Agreement should be obtained among members of the Technical
Committee concerning input field modifications arising from
the quality assurance testing. These modifications should be
based on scientific or physical reasoning and not just on what
will improve model performance. All changes to the data that
result from the diagnostic testing should be documented and
In addition, all diagnostic steps should be documented to
avoid misinterpretation of model performance results. After
confidence is gained that the simulation is based on
reasonable interpretations of observed data, and model
concentration fields generally track (both spatially and
temporally) known urban-scale plumes, a performance evaluation
based on numerical measures is conducted for each base
meteorological episode (see Chapter 5).
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castellano: DISPER CUSTIC DESCAR RADIA italiano:
deutsch: DIS CUS DES RAD
castellano: DIS CUS DES RAD english: DIS CUS DES RAD
português: DIS CUS DES RAD italiano: DIS CUS DES RAD
français: DIS CUS DES RAD