The new model developed by AERMIC is aimed at short-range dispersion from stationary

industrial sources, the same scenario handled by the EPA Industrial Source Complex Model,

ISC3 (U.S.Environmental Protection Agency 1995). This work clearly has benefitted from the

model development activities of the1980's especially in the parameterization of mean winds and

PBL turbulence, dispersion in the CBL, and the treatment of plume/terrain interactions.

Techniques used in the new model for PBL parameterizations and CBL dispersion are similar to

those used in earlier models. Turbulence characterization in the CBL adopts "convective

scaling" as suggested by Deardorff (1972) as is included in most of the models mentioned above

(e.g., PPSP, OML, and HPDM). Algorithms used in these earlier models were considered along

with variants and improvements to them. In addition, the developers of OML met with

AERMIC to discuss their experiences. Thus, much credit for the AERMIC model development

is to be given to the pioneering efforts of the 1980s.

1.2 The AERMIC Focus: A Replacement for the ISC3 Model

AERMIC’s initial focus has been on the regulatory models that are designed for estimating

near-field impacts from a variety of industrial source types. EPA’s regulatory platform for

near-field modeling, during the past 25 years has, with few exceptions, remained fundamentally

unchanged. During this period, ISC3 was the workhorse regulatory model (used in the

construction of most State Implementation Plans, new source permits, risk assessments and

exposure analysis for toxic air pollutants) with code structure that is conducive to change.

Therefore, AERMIC selected the EPA’s ISC3 Model for a major overhaul. AERMIC’s

objective was to develop a complete replacement for ISC3 by: 1) adopting ISC3's input/output

computer architecture; 2) updating, where practical, antiquated ISC3 model algorithms with

newly developed or current state-of-the-art modeling techniques; and 3) insuring that the source

and atmospheric processes presently modeled by ISC3 will continue to be handled by the

AERMIC Model (AERMOD), albeit in an improved manner.

The AERMOD modeling system consists of two pre-processors and the dispersion model.

The AERMIC meteorological preprocessor (AERMET) provides AERMOD with the

meteorological information it needs to characterize the PBL. The AERMIC terrain


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