The Pseudo-Spectral Technique in the Computation of Seasonal Average Concentrations and Its Comparison with the Trajectory Technique

Since there is now a greater awareness of the chronic effects of exposure to low levels of atmospheric pollutants, the long-range transport of atmospheric material is receiving increasing attention in recent years. Furthermore, there is the concern about the effects of successor species which come about by, for instance, chemical transformation or radioactive decay of the primary species during transport in the atmosphere. Concentrations of successor species may build up slowly and consequently transport processes may need to be studied over long distances.