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ONE-ATMOSPHERE DYNAMICS DESCRIPTION IN THE MODELS-3 COMMUNITY MULTI-SCALE QUALITY (CMAQ) MODELING SYSTEM
Citation:
Byun, D W. ONE-ATMOSPHERE DYNAMICS DESCRIPTION IN THE MODELS-3 COMMUNITY MULTI-SCALE QUALITY (CMAQ) MODELING SYSTEM. Presented at Air Pollution 99, Seventh International Conference, San Francisco, CA, July 27-29, 1999.
Impact/Purpose:
The objectives of this task are to continuously develop and improve the Community Multiscale Air Quality (CMAQ) modeling system, which is the science implementation within the Models-3 system framework for air quality simulation. CMAQ is a multiscale and multi-pollutant chemistry-transport model (CTM) that includes the necessary critical science process modules for atmospheric transport, deposition, cloud mixing, emissions, gas- and aqueous-phase chemical transformation processes, and aerosol dynamics and chemistry. It relies on Models-3 I/O API to support machine independent data access and maintains simple interfaces among science processor modules to provide a high-level of modularity.
Description:
This paper proposes a general procedure to link meteorological data with air quality models, such as U.S. EPA's Models-3 Community Multi-scale Air Quality (CMAQ) modeling system. CMAQ is intended to be used for studying multi-scale (urban and regional) and multi-pollutant (ozone, aerosol, and acid/nutrient depositions) air quality problems. The Models-3 CMAQ system is expected to be a common vehicle to advance environmental modeling techniques for scientist and the regulatory community. To provide multi-scale capability for meteorological and air quality modeling, a set of governing equations for the fully compressible atmosphere is introduced. By recasting input meteorological data with the variables that satisfy the governing equations in a generalized coordinate system, CMAQ can follow the dynamics and thermodynamics of the meteorological model closely. A robust mass conservation scheme is introduced and discussed.