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DEVELOPMENT AND TESTING OF THE CBM-IV (CARBON-BOND MECHANISM) FOR URBAN AND REGIONAL MODELING
Citation:
Gery, M., G. Whitten, AND J. Killus. DEVELOPMENT AND TESTING OF THE CBM-IV (CARBON-BOND MECHANISM) FOR URBAN AND REGIONAL MODELING. U.S. Environmental Protection Agency, Washington, D.C., EPA/600/3-88/012.
Description:
The development and testing of an updated Carbon Bond Mechanism (CBM) is described. The new mechanism, called CBM-IV, was designed for use in EPA's OZIPM-EKMA model. The mechanism, however, is also suitable for use in large air quality simulation models such as the Urban Airshed Model and EPA's Regional Oxidant Model. The mechanism differs from earlier versions of the CBM in that the chemistry of aromatic hydrocarbons has been significantly altered to account for the sensitivity of ozone formation to the organic-to-NOx ratio. A new condensed chemistry for isoprene has also been incorporated into the mechanism. The CBM-IV was tested against 200 smog chamber runs that were conducted in outdoor and indoor smog chamber facilities. The mechanism was found to yield good agreement to the experimental data for a wide variety of organic systems over a wide range of organic-to-NOx ratios.