A Mesoscale Transport and Diffusion Model


Roland R. Draxler


NOAA Technical Memorandum ERL ARL-64,  June 1977


Abstract - A mesoscale Lagrangian trajectory transport and diffusion model has been developed which takes into account stability changes along the trajectory.  The required input data for trajectory computations are hourly surface meteorological observations and standard upper air observations.  A one-dimensional finite difference model for vertical diffusion and deposition is used in the calculations with each trajectory.  The vertical mixing coefficient is based upon the Pasquill stability at each trajectory segment.  Dry deposition and washout are calculated if required. The transport layer, that layer that contains 90% of the mass as calculated by the finite difference method, grows with time along the trajectory.  Air concentrations are calculated for specified sampling periods at selected receptor locations.


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