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COMPARISON OF MODELED CONCENTRATION PROFILES USING SITE-SPECIFIC AND CONSTANT-CONDITION METEOROLOGICAL DATA FOR THE ISCLT AND PAL MODELS
Citation:
Streicher, J. AND B. Templeman. COMPARISON OF MODELED CONCENTRATION PROFILES USING SITE-SPECIFIC AND CONSTANT-CONDITION METEOROLOGICAL DATA FOR THE ISCLT AND PAL MODELS. U.S. Environmental Protection Agency, Washington, D.C., EPA/600/A-92/236 (NTIS PB93120921).
Description:
Modeling atmospheric pollutant dispersion from ground-level area sources generally requires site-specific, or at least site-representative meteorological data. odels that predict annual-average concentrations as a function of radial distance and azimuthal direction accept data in standard formats such as STability ARray (STAR), or hourly (CD-144) format. he Industrial Source Complex - Long Term (ISCLT) model and the Point, Area, Line Source (PAL) model are two examples. owever, an air quality screening analysis may only require estimates of the annual-average radial maximum concentrations. odeled annual-average radial maximum concentrations (azimuth-independent) are less sensitive to the variations inherent in site-specific meteorological data. uch a one-dimensional treatment does not fully utilize, and therefore may not require, the two-dimensional information that is available in conventional meteorological data formats such as STAR or CD-144. s there a single combination of atmospheric stability, wind speed, and frequency of occurence (i.e., an azimuth-independent "constant-condition" pseudo-meteorological data input) which can provide a useful screening estimate of the annual-average radial maximum concentration profiles for ground-level area sources? omparison of modeled annual-average radial maximum concentration profiles, from a small area source, was made between several constant conditions and meteorological data from several site. wo models were selected representing different modeling approaches, the ISCLT model (a sector-average Gaussian plume dispersion algorithm), and the PAL omdel (a finite-line-source "point estimate" Gaussian plume dispersion algorithm). easonably good representation of annual-average radial maximum concentration profiles from ground-level area sources for five meteorological sites was simulated using constant conditions; however, the resulting single combination of atmospheric stability, wind speed, and frequency of occurrence that produced radial maximum concentrations are model dependent.
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COMPARISON OF MODELED CONCENTRATION PROFILES USING SITE-SPECIFIC AND CONSTANT-CONDITION METEOROLOGICAL DATA FOR THE ISCLT AND PAL MODELS