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Chemical Transport Models

Model Model for Ozone and Related chemical Tracers (MOZART)
Description / Purpose 3D global chemical transport model developed at NCAR, MPI-Met and NOAA/GFDL. Comprehensive model of atmospheric composition to simulate chemical and transport processes. Includes tropospheric and stratospheric chemistry. Resolves the Earth’s chemical composition from the ground to altitude far above the highest flight cruise level, giving better perturbation signal in the upper troposphere.
Data source / Input Standard meteorological fields, anthropogenic emissions, aviation and shipping emissions.
Output Extensive chemical scheme: CO, NOx, OH, CH4, NMHCs etc in T42LR or T63LR
Spatial dimension Global
Temporal dimension Daily, monthly, annual.
Sample applications Widely used and many papers by developers and users. Currently used at MMU in 2 PhDs and work underway for publication on aircraft and shipping applications.
Description / Purpose 2D global chemical transport model that is computationally efficient. Designed to provide estimates of atmospheric composition quickly. Can be used in transient mode and useful in the investigation of NOx-related aviation impacts.
Data source / Input Standard meteorological fields, anthropogenic and aviation emissions.
Output Extensive chemical scheme including CO, NOx, OH, CH4, NMHCs etc.
Spatial dimension Global
Temporal dimension Monthly, annual.
Sample applications Developed and used at MMU for long-term integrations (100 years) and calculation of inputs to climate metric models. Basis of 1 PhD.


  • Brasseur G.P., Hauglustaine D.A., Walters S., Rasch R.J., Müller J.-F., Granier C. and Tie X. X. (1998) MOZART, a global chemical transport model for ozone and related chemical tracers 1. Model description. J. Geophys. Res., 103(D21), 28265–28289.
  • Hauglustaine D.A., Brasseur G.R., Walters S., Rasch P.J., Müller J.-F., Emmons L.K. and Carroll M.A. (1998) MOZART, a global chemical transport model for ozone and related chemical tracers 2. Model results and evaluation. J. Geophys. Res., 103(D21), 28291–28335.
  • Horowitz L.W., et al. (2003) A global simulation of tropospheric ozone and related tracers: Description and evaluation of MOZART, version 2. J. Geophys. Res., 108(D24), 4784, doi: 10.1029/2002JD002853.
  • Kinnison D.E., et al. (2007) Sensitivity of chemical tracers to meteorological parameters in the MOZART-3 chemical transport model. J. Geophys. Res., 112, D20302, doi: 10.1029/2006JD007879.
  • Emmons L.K., Walters S., Hess P.G., Lamarque J.-F., Pfister G.G., Fillmore D., Granier C., Guenther A., Kinnison D., Laepple T., Orlando J., Tie X., Tyndall G., Wiedinmyer C., Baughcum S.L. and Kloster S. (2010) Description and evaluation of the Model for Ozone and Related chemical Tracers, version 4 (MOZART-4). Geosci. Model Dev., 3, 43-67.



  • Hough A.M. (1989) The development of a two-dimensional global tropospheric model. 1. The model transport. Atmospheric Environment, 23, 1235-1261.
  • Hough A.M. and Derwent R.G. (1990) Changes in the global concentration of tropospheric ozone due to human activities. Nature, 344, 645-650.
  • Hough A.M. (1991) Development of a two-dimensional global tropospheric model: model chemistry. Journal of Geophysical Research, 96, 7325-7362.
  • Hough A.M. and Johnson C.E. (1991) Modelling the role of nitrogen oxides, hydrocarbons and carbon monoxide in the global formation of tropospheric oxidants. Atmospheric Environment – Part A General Topics, 25 A, 1819-1835.
  • Derwent R.G. (1996) The influence of human activities on the distribution of hydroxyl radicals in the troposphere. Philosophical Transactions of the Royal Society A: Mathematical, Physical and Engineering Sciences, 354, 501-531.
  • Johnson C.E. and Derwent R.G. (1996) Relative radiative forcing consequences of global emissions of hydrocarbons, carbon monoxide and NOx from human activities estimated with a zonally-averaged two-dimensional model. Climatic Change, 34, 439-462.