the computations; concentrations may be significantly

underestimated for sources or receptors too close to the edge

of the computational grid.

Spatial Resolution

The various grid systems used in the MESOPUFF-II modeling

system are all relative to the initially defined meteorological

grid. Therefore, the resolution (grid spacing) of the

meteorological grid is of prime importance. Since the

meteorological fields, generated by the MESOPAC processor, are

defined from the interpolation of available observations, the

practical resolution of those fields will depend on the

distance between observation stations. Therefore, the maximum

recommended resolution is the median distance between 13

observation stations. Finer resolutions can be used, but at

the cost of some computation time. If an area in the domain is

considered very important and has relatively dense

meteorological observations, then the resolution should be

based on this area of more refined observations.

In general, all available meteorological stations within

the initially defined grid system should be included in the

analysis. Stations relatively near to the boundaries,

particularly upper air stations, should also be included, as

they will improve the representativeness of the wind fields

generated by the interpolation.

Temporal Scale

In order to capture year-to-year meteorological

variability and the effect that can have on air pollution

concentrations, five years of meteorological data should be run

with the MESOPUFF-II modeling system.

Precipitation and Upper Air Meteorological Processors

The version of MESOPAC, the meteorological processor for

the MESOPUFF-II modeling system, being distributed, can make

use of upper-air meteorological data in either a TD-5600 format

or the newer TD-6201 format. Processors for both of these data

types are provided with the modeling system. Precipitation

data is now distributed in a TD-3240 format. Descriptions and

information on running these processors are provided below.

User Instructions - Preprocessor Programs

READ56/READ62 Upper Air Preprocessors

READ56 and READ62 are preprocessing programs which extract

and process upper air wind and temperature data from standard



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