A Comparative Study of Two Trajectory Models of Long-Range Transport

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Abstract
The objective of this paper is to compare two widely used Lagrangian trajectory models: The Air Resources Laboratory Atmospheric Transport and Dispersion Model and the Meso-Scale Transport and Diffusion Model. The method used is a direct comparison of model trajectories calculated under various meteorological situations. An attempt is made to relate the observed differences between the trajectories computed from each model to the treatment of the physics in each model. The meteorological conditions conducive to the production of errors in the trajectory computations and the weaknesses of each model in treating complex meteorological regimes are discussed.