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 task supports ORD's strategy by providing responsive technical support of EPA's mission and provides credible state of the art air quality models and guidance. This research effort is to develop and improve the Community Multiscale Air Quality (CMAQ) modeling system, a multiscale and multi-pollutant chemistry-transport model (CTM). Specific research components include: evolvement of science in the CMAQ modeling system, generalized coordinate system: matching met/CTM multi-scaling capabilities, plume-in-grid approach, atmospheric modeling of PM at neighborhood scales, chemical mechanism reader and solvers, fluid modeling simulations of subgrid scale phenomena, "one-atmosphere" modeling framework (Models-3), and EBM/OBM modeling framework.

This task utilizes high performance computing and scientific visualization resources provided by EPA's National Environmental Scientific Computing Center (NESC2).

Record Details:

Record Type:PROJECT

Start Date:07/01/1998

Completion Date:09/30/2002

Record ID: 15865

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Project Information:

Progress :
Byun, D.W. et al. Description of Models-3 Community Multiscale Air Quality (CMAQ) Model: System Overview, Governing Equations, and Science Algorithms. To be submitted to Applied Mechanics Reviews. (A)

Schere, K.L. "U.S. EPA Models-3/CMAQ - status and applications." Paper presented at: US/German Ozone/Fine Particle Science and Environmental Chamber Workshop, Riverside, CA, October 4-6, 1999. (A)

Revised public release of the CMAQ model as part of the June 2000 Models-3 and CMAQ release package. (A)

Byun, D.W. and J. E. Pleim: "Sensitivity of ozone and aerosol predictions to the transport algorithms in the Community Multi-scale Air Quality (CMAQ) Modeling System" Paper presented at the Millennium NATO/CCMS International Technical Meeting on Air Pollution Modeling and Its Application, held May 15-19, 2000 in Boulder, CO. (A)

Meteorology-Chemistry Interface Processor (MCIP) Version 2, re-engineered software in Fortran 90 with significant new scientific features and capabilities. Part of CMAQ community release, November 2001. (B)

Byun, D.W. "Description of atmospheric transport processes in Eulerian air quality models." Published in: Mesoscale Atmospheric Dispersion: Advances in Air Pollution Series, Feb. 2000. (B)

Byun, D.W., A. Lacser, W. Benjey, and J.K.S. Ching: "Effects of grid resolution on the simulation of urban air quality: Application of Models-3/CMAQ to the Philadelphia Metropolitan Area at 12-, 4-, and 1.3-km resolutions" Paper presented at the Third Symposium on the Urban Environment, 14-18 August, 2000, Davis, CA. (B)

Sugata, S., Byun, D.W., and Uno, I. "Simulation of sulfate aerosol in east Asia using Models-3/CMAQ with RAMS meteorological data." Paper presented at: Millennium NATO/CCMS International Technical Meeting,Boulder, CO, May 16-19, 2000 (B)

Han, J., and Byun, D.W. "A multi-stream model for vertical mixing of a passive tracer in the convective boundary layer." Paper presented at 11th Joint Conference on the Applications of Air Pollution Meterology with the AWMA, Long Beach, CA, January 9-14, 2000. (B)


Godowitch, J.M.: "Results of photochemical simulations of subgrid scale point source emissions with the Models-3 CMAQ modeling system" Paper presented at the AMS Symposium on Atmospheric Chemistry, 14-19 January 2001, Albuquerque, NM (C)

Godowitch, J.M. and J.O. Young: "Photochemical simulations of point source emissions with the Models-3 CMAQ Plume-in-Grid Approach" Paper presented at the AWMA 93rd Annual Conference, 18-22 June, 2000, Salt Lake City, UT (C)

Ching, J., A. Lacser, D. Byun, and W. Benjey, 2001: Air quality modeling at neighborhood scales to improve human exposure assessment. Proceedings of the Third International Conference on Urban Air Quality, 19-23 March 2001, Loutraki, Greece.

Ching, J., A. Lacser, T. Otte, D. Byun, and J. Herwehe: "Modeling air toxics and PM-2.5 concentration fields as a means for facilitating human exposure assessments." Proceedings of the 10th Interantional Symposium "Transport and Air Pollution", Boulder, CO, September 17-19, 2001. (D)

Otte, T.L., and A. Lacser, 2001. Implementation of an urban canopy parameterization in MM5 for meso-gamma-scale air quality modeling applications. Preprints, AMS Ninth Conf. on Mesoscale Processes, Ft. Lauderdale, FL, 78-81. (D)

Ching, J.K.S. "Air quality modeling of PM and air toxics at neighborhood scales."Paper presented at: 11th Joint Conference on the Application of Air Pollution with the AWMA, Long Beach, CA, January 9-14, 2000. (D)

Ching, J., A. Lacser, D. Byun, W. Benjey: Air quality modeling of PM and air toxics at neighborhood scales to improve human exposure assessments. Paper presented at AMS Urban Environment Symposium, August 2000, Davis, CA (D)

Byun, D.W., A. Lacser, W. Benjey, J. Ching: Effects of Grid Resolution on the simulation of urban air qua

Relevance :There is a need for a common work environment for comprehensive air quality modeling. As our knowledge on the environment improves, the linkage of natural processes will be diversified. Because no one group of scientists can have expertise in all required diverse air quality science areas, we promote a community modeling paradigm. A common modeling framework will change the modeling culture by making modelers more open and collaborative and allowing verification of modeling results by other scientists. Air quality model users demand that multi- pollutants and multiscale modeling should be done within one system. Models must be designed with highly modular characteristics that permit major process components to be "plugged in" and readily exercised, because the science of many key processes is constantly improving and there are many alternative physical/chemical parameterization's that need to be tested. The system also needs sound diagnostic tools as well as analysis and visualization components.

Clients :Joe Tikvart, David Mobley -OAR/OAQPS

Project IDs:

ID Code :3873

Project type :OMIS