rectangular grid become more pronounced for larger dimensions. Maximum recommended

dimensions for the modeling domain of 1000 km in the east-west direction and 600 km in the

north-south direction are suggested. Grid resolution is recommended to range from 10 to 50

km, based on the overall size of the domain and limitations in data storage.

Meteorological Domain

This domain is defined through inputs to the MESOPAC II meteorological preprocessor

(hereafter referred to as MESOPAC), and is the basic reference frame for all spatially varying

input data to MESOPUFF II. In the Phase 1 demonstration implementation of MESOPUFF II,

PSD and AQRV impacts were estimated for receptors located in and around Shenandoah

National Park (SNP) and James River Face Wilderness (JRFW) in Virginia. These Class I

areas are 250-300 km west of the Atlantic Coast. Prevailing winds tend to be from the

southwest but range from south through northwest. Considering the regional meteorology

along with known PSD source emission distributions in the eastern U.S., we suggested in the

protocol that the meteorological domain extend further to the west from SNP than it does to

the east. Consequently, we developed a preliminary domain to cover a full 1000 by 700 km

region, extending about 300 km to the north, east and south of SNP, and 500+ km to the west.

We then proposed two optional extensions to this domain. In the first option, the southern

boundary of the preliminary domain could be extended southward by 100 km to encompass a

larger potential source region, which could strongly impact the Shenandoah area under

prevailing southwest flow conditions. In the second option, the northern boundary could

similarly be extended 100 km northward, which would encompass the important source

regions of northern Ohio as well as include all of EPA Region III.

Although both extensions would safely contain (within an ample number of buffer cells) all

potential source areas to be modeled by future MESOPUFF II applications, we proposed

implementing the preliminary 1000 by 700 km domain (without extensions) for the Phase 1

MESOPUFF II demonstration. This decision was primarily based on projected data and

storage requirements and the fact that the longitudinal and meridional extents of the

preliminary domain were at recommended limits. Beyond these issues, however, we felt that

this grid represents the best balance between adequate geographical coverage and the

performance limits of the MESOPUFF II model; i.e., sources located in regions beyond the

boundaries of this grid would not be well modeled by MESOPUFF II as the model was not

designed for travel distances beyond 500 km. Further, although application of MESOPUFF II

will not necessarily utilize the full meteorological domain in this or future studies, it was

desirable to generate relatively well resolved meteorological fields on a large regional domain

so that we could establish a flexible meteorological database for future MESOPUFF II

applications.

Recommended grid spacing for MESOPUFF II is 10-50 km. The IWAQM selected a grid

spacing of 20 km for the demonstration study. To minimize storage and CPU requirements,

grid spacing of 40 or 50 km could have been used, but may have degraded model estimates.

 

 

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