Author(s)

J.R. Manson, S.G. Wallis & D. Wang

Abstract

The paper describes a semi-Lagrangian transport algorithm for predicting the fate of episodically released atmospheric pollutants in multi-dimensions. The method employs a computational grid that aligns with the natural coordinate system of the atmospheric flow field. This results in a simplified advection- diffusion-reaction system that is perfectly suited to solution using an unconditionally stable semi-Lagrangian method. This uses third order interpolation for the advective fluxes with a convexity preservation algorithm to prevent grid scale oscillations: solutions are thus conservative, monotonic and highly accurate. The meth

Keywords