This report is part of the description of a tentative version of the three-dimensional regional air quality model LOTOS-HPCN. The starting-point of these models is the solution of the continuity equation that describes the change in concentration of a chemical species in the air as a result of transport, emissions, chemistry and some other processes. The physical domain of the model is part of a shell around the earth. In the vertical direction hybrid coordinates are used: the lower boundary is given by the orography of the earth and the upper boundary by a surface having equal pressure. For reasons of computational simplicity such an irregular physical domain is often transformed into a rectangular computational domain. The necessary transformation of the model equation is also described in this report.

Meteorology and atmospheric physics (msc 86A10), Classical flows, reactions, etc. (msc 92E20)
Modelling, Analysis and Simulation [MAS]
Computational Dynamics

Blom, J.G, & Roemer, M.G.M. (1997). Description of the 3D LOTOS model. Modelling, Analysis and Simulation [MAS]. CWI.