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MODELS - 3
Models-3 is a third generation air quality modeling system that contains a variety of tools to perform research and analysis of critical environmental questions and problems. These tools provide regulatory analysts and scientists with quicker results, greater scientific accuracy and reliability, and better support for environmental decision making. The initial version of Models-3 focuses on urban to regional scale air quality simulation of ground level ozone, acid deposition, visibility and fine particulate. Models-3 will help you with a wide range of environmental management tasks, from performing regulatory and policy analysis to understanding the interactions of atmospheric chemistry and physics. Using Models-3, you can prepare meteorological and emissions data for urban and regional scale models and perform quality control of the models input data. An air quality modeling system is a computational system environment; it combines physical and chemical models that describe the atmospheric processes for simulating gas distributions in the atmosphere. Three types of models in Models-3 are meteorological, emissions, and chemistry transport. The features for these models include: ? Meteorological model - simulates atmospheric motions, fields of pressure, moisture, and temperature; fluxes of momentum, moisture, and heat; turbulence characteristics; clouds and precipitation; and atmospheric radiative characteristics ? Emissions model - simulates gas and particulate emissions into the atmosphere, and is dependent upon the surrounding meteorological conditions and socioeconomic activities. ? Chemistry Transport Model (CTM) - simulates various chemical and physical processes that are thought to be important for understanding the atmospheric gas transformations and distributions.