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.
1.2The 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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castellano: DISPER CUSTIC DESCAR RADIA italiano:
deutsch: DIS CUS DES RAD
castellano: DIS CUS DES RAD english: DIS CUS DES RAD
português: DIS CUS DES RAD italiano: DIS CUS DES RAD
français: DIS CUS DES RAD