Impact/Purpose:

The goal of this research is to develop and test appropriate chemical and physical mechanisms for use in EPA's Models-3 chemical/transport models. These models will be addressing issues of tropospheric photochemistry, fine particles, toxic and semi-volatile substances, and acid deposition. As such, scientifically credible mechanisms for atmospheric gas- and aqueous-phase chemistry as well as heterogeneous chemistry, applicable to the particular pollutant regimes must be included in Models-3.

Description:

The goal of this task is to develop and test chemical and physical mechanisms for use in the chemical transport models of EPA's Models-3. The target model for this research is the Community Multiscale Air Quality (CMAQ) model. These mechanisms include gas and aqueous phase photochemistry, and heterogeneous chemistry and physics of fine particle formation. Research components include gas phase chemistry, cloud dynamics and aqueous chemistry, photolysis rates and radiative transfer model improvements, aerosol representations for grid models, modeling of transport and deposition of air toxics, and modeling of transport and deposition of mercury.

Record Details:

Record Type:PROJECT

Start Date:07/01/1998

Completion Date:09/30/2002

Record ID: 56138

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Project Information:

Progress :Gipson, G. Technical Issues Associated with the Implementation of Morphecules in Models-3/CMAQ. EPA Internal Report. FY-01 APM#91, September 2001. (A)

Gipson, G., and J. Young. Gas-phase chemistry. In Science algorithms of the EPA Models-3 Community Multiscale Air Quality (CMAQ) modeling system. Part I: Chapters 1-8. D.W. Byun and J.K.S. Ching (Eds.). EPA-600/R-99/030, National Exposure Research Laboratory, U.S. Environmental Protection Agency, Research Triangle Park, NC, 8-1-8-28 (1999). (A)

Roselle, S.J., and F.S. Binkowski. Cloud dynamics and chemistry. In Science algorithms of the EPA Models-3 Community Multiscale Air Quality (CMAQ) modeling system. Part II: Chapters 9-18. D.W. Byun and J.K.S. Ching (Eds.). EPA-600/R-99/030, National Exposure Research Laboratory, U.S. Environmental Protection Agency, Research Triangle Park, NC, 11-1-11-8 (1999). (B)

Roselle, S.J., K.L. Schere, J.E. Pleim, and A. Hanna. Photolysis rates for CMAQ. In Science algorithms of the EPA Models-3 Community Multiscale Air Quality (CMAQ) modeling system. Part I: Chapters 9-18. D.W. Byun and J.K.S. Ching (Eds.). EPA-600/R-99/030, National Exposure Research Laboratory, U.S. Environmental Protection Agency, Research Triangle Park, NC, 14-1-14-5 (1999). (C)

Kondragunta, S., Udelhofen, P.M., Schere, K.L., Roselle, S.J., and Holben., B."Attenuation of solar UV radiation by aerosols during air pollution episodes." Paper presented at AMS Conference, Long Beach, CA, January 9-14, 2000. (C)

Binkowski, F.S. and S.J. Roselle, 2001: Models-3 Community Multiscale Air Quality (CMAQ) Model Aerosol Component. I. Description. FY-01 APM#26, to be submitted to Journal of Geophysical Research (D)

Mebust, M.R., B.K. Eder, F.S. Binkowski, and S.J. Roselle, 2001: Models-3 Community Multiscale Air Quality (CMAQ) Model Aerosol Component. II. Model Evaluation. To be submitted to Journal of Geophysical Research (D)

The CMAQ aerosol model was revised to add prediction of aerosol surface area concentration for the Aitken and accumulation modes thus allowing for a variable geometric standard deviation. All parameters of the lognormal size distribution (number, geometric mean diameter, and geometric standard deviation) at each grid cell are now time varying. This new version was incorporated into CMAQ model and included in the June 2000 release. (D)

Binkowski, F.S. The aerosol portion of Models-3 CMAQ. In Science algorithms of the EPA Models-3 Community Multiscale Air Quality (CMAQ) modeling system. Part II: Chapters 9-18. D.W. Byun and J.K.S. Ching (Eds.). EPA-600/R-99/030, National Exposure Research Laboratory, U.S. Environmental Protection Agency, Research Triangle Park, NC, 10-1-10-16 (1999). (D)

Zhang, Y., C. Seigneur, J.H. Seinfeld, M. Jacobson, S.L. Clegg, and F.S. Binkowski. A comparative study of inorganic aerosol thermodynamic equilibrium modules: similarities, differences, and their likely causes. Atmospheric Environment 34:117-137 (2000). (D)

Zhang, Y., C. Seigneur, J. H. Seinfeld, M.Z. Jacobson, and F.S. Binkowski. Simulation of aerosol dynamics: a comparative review of algorithms used in air quality models. Aerosol Science and Technology, 31:487-514 (1999a). (D)

Zhang, Y., C. Seigneur, J. H. Seinfeld, M.Z. Jacobson, and F.S. Binkowski. A comprehensive evaluation of aerosol dynamics modules in 3-d PM air quality models. Presented at the 18th Annual Conference of the American Association for Aerosol Research, Tacoma, Washington, October 11-15 (1999b). (D)

W. Hutzell and E. Cooter. "A regional atmospheric fate and transport model for atrazine Part I: Development and Implementation." In Agency Review (Sept. 2001). (E)

Cooter, E. and W. Hutzell. "A regional atmospheric fate and transport model for atrazine Part II: Evaluation." In Agency Review (Sept. 2001). (E)

Cooter, E.J. and Y. Cohen, "Modeling

Relevance :The research performed in this task is designed to provide the necessary simulation capabilities for the Models-3/CMAQ air quality model, and to keep the science in the model at the state-of-the-art. This model, used for research and regulatory applications by the EPA, states, and others must have current up-to-date science for the highest level of credibility.

Clients :Joseph Tikvart, David Mobley - OAR/OAQPS

Project IDs:

ID Code :3872

Project type :OMIS