Scire, J.S., F.W. Lurmann, A. Bass, and S.R. Hanna. 1984a.

Development of the MESOPUFF-II Dispersion Model. EPA-

600/3-84-057. U.S. Environmental Protection Agency,

Atmospheric Research and Exposure Assessment Laboratory,

Research Triangle Park, NC.

Scire, J.S., F.W. Lurmann, A. Bass, and S.R. Hanna. 1984b.

User's Guide to the MESOPUFF-II Model and Related

Processor Programs. EPA-600/8-84-013. U.S. Environmental

Protection Agency, Atmospheric Research and Exposure

Assessment Laboratory, Research Triangle Park, NC.

Thomson, R.B., R.P. Angle, and S. Sakiyama. 1987. Selecting

Air Quality-Acid Deposition Models for Mesoscale

Application. J. Air Pollution Cont. Assoc., 37(3):260-

265.

Appendix A

IWAQM Recommendations for

Running The MESOPUFF-II

Modeling System

A-1

IWAQM RECOMMENDATIONS FOR RUNNING THE

MESOPUFF-II MODELING SYSTEM

The MESOPUFF-II modeling system was designed to include

flexibility in its use, so it could be used to simulate a wide

variety of conditions. Therefore, a number of user specifiable

parameters were included as input to the system. Furthermore,

the MESOPUFF-II modeling system is capable of simulating

varying spatial and temporal scales, which also need

specification. The purpose of the recommendations contained in

this appendix is to provide consistent, technically credible

methods for operating the MESOPUFF-II modeling system for

regulatory applications. These recommendations refer to model

specific variables and options without detailed definition of

the options. The user is referred to the MESOPUFF-II user's

manual for further information, where needed.

The primary focus of these recommendations is for the

evaluation of air pollution impacts on Class I areas, both

increment consumption and the impacts on Air Quality Related

Values (AQRVs), from sources located more than 50 kilometers

from the potentially affected area. The general procedures

outlined could also be used for the assessment of pollution

impacts, for source-receptor distances greater than 50 km,

outside of Class I areas. The applicability of such techniques

should, however, be confirmed with the appropriate regulatory

authorities.

Other documents which may be useful to the users of these

recommendations include:

User's Guide to the MESOPUFF-II Model and Related

Processor Programs, (EPA-600/8-84-013).

A Modeling Protocol for Applying MESOPUFF-II to Long Range

Transport Problems, (EPA-454/R-92-021).

Development of the MESOPUFF-II Dispersion Model, (EPA-

600/3-84-057).

Spatial Scale

The MESOPUFF-II modeling system is generally applicable to

source-receptor distances greater than 50 kilometers. The grid

dimensions used in the MESOPUFF-II system, upon which the

meteorological fields are defined and the puff calculations are

performed, should not exceed 1000 km in the east-west direction

or 600 km in the north-south direction (EPA-454/R-92-021).

With grid distances greater than this, significant errors can

be introduced through the orthogonal nature of the modeling

grid, superimposed on the curved surface of the earth. The

computational grid size should be such that sources and

receptors of interest are not too close to the edge of the

grid, since once puffs leave the grid, they are eliminated from

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