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As part of a series of modeling applications in progress, the objective of this study was to conduct
an annual simulation over the continental United States using a comprehensive air quality
modeling system, the U.S.EPA’s Models-3/Community Multi-scale Air Quality (CMAQ)
modeling system. This work assessed the feasibility of using the Models-3/CMAQ system for
applications over an entire year on criteria pollutants such as PM2.5 and ozone and related
regional haze issues. The Models-3/CMAQ simulation covered the entire continental United
States using a 36-km grid resolution throughout the whole year of 1996. The Mesoscale Model
Version 5 (MM5) was used to provide meteorological input fields for the model simulations. The
Sparse Matrix Operator Kernel Emissions (SMOKE) Modeling System was used to prepare
emission inputs based on the recently updated National Emission Trend (NET) inventory. It was
demonstrated in this study that the Models-3/CMAQ system was capable of simulating multiple
air pollutants for an entire year reasonably well and within an acceptable timeframe. The
preliminary results showed that in the summer months when sulfate PM was the dominant PM2.5
species, the model simulated PM2.5 fairly well. However, in the winter months when nitrate PM
became a significant part of PM2.5, the model overpredicted PM2.5, possibly due to
overprediction of nitrate PM. This could be due to overestimates of ammonia emissions in the
winter months; on-going emission inventories and modeling studies indicate the likelihood of
such overestimates. The simulation results also showed that in the eastern U.S., sulfate PM was
the dominant PM 2.5 species, while in the western U.S., nitrate PM was a significant PM 2.5
constituent; this was generally consistent with observed data. The next step in this series of
modeling efforts is to evaluate the model simulation results against observations such as
IMPROVE and CASTNET data and against model results from other models such as the
Regulatory Modeling System for Aerosols and Deposition (REMSAD).
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CNumber:
ACE 2001 ORLANDO, FLORIDA
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Publication Type:
Proceedings
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Publication Date:
June 2001
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