Conversion of Meteorological Outputs to Air Quality Model Inputs: Even before

determining how the meteorological model is configured, careful thought should be given to the

compatibility between candidate meteorological models and the air quality model(s) chosen for

use. A variety of post-processors exist to convert the outputs from the meteorological models

into the input formats of the air quality models. Some examples include: the Meteorology

Chemistry Interface Processor (MCIP) (Otte, 2004), MM5CAMx (Environ, 2006a), and

RAMSCAMx (Environ, 2006a). These meteorological preprocessors provide a complete set of

meteorological data needed for the air quality simulation by accounting for issues related to: 1)

data format translation, 2) conversion of parameter units, 3) extraction of data for appropriate

window domains, 4) reconstruction of the meteorological data on different grid and layer

structures, and 5) calculation of additional variables.

16.3 How Should the Performance of the Meteorological Modeling Be Evaluated?

While the air quality models used in attainment demonstrations have consistently been

subjected to a rigorous performance assessment, in many cases the meteorological inputs to these

models are accepted as is, even though this component of the modeling is arguably more

complex and contains a higher quantity of potential errors that could affect the results of the

analysis (Tesche, 2002). EPA recommends that States/Tribes devote appropriate effort to the

process of evaluating the meteorological inputs to the air quality model as we believe good

meteorological model performance will yield more confidence in predictions from the air quality

model. One of the objectives of this evaluation should be to determine if the meteorological

model output fields represent a reasonable approximation of the actual meteorology that

occurred during the modeling period. Further, because it will never be possible to exactly

simulate the actual meteorological fields at all points in space/time, a second objective of the

 

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