Simple Pollution Transport Model with Parameterized Vertical Structure

Abstract

The present work aims at obtaining long time air pollution evaluation with a three-layer numerical model. The model atmosphere extends from the earth’s surface to a level, which is supposed to be a free material surface where the flow disturbances caused by the earth’s surface disappear. The layer of turbulent atmosphere extends from the earth’s surface to a level, which varies as a result of the entertainment of air from or to the above lying air. The turbulent layer has a sub-layer (surface layer) with constant depth. It is assumed that the pollutants are vertically homogeneous in the layers. The model accounts for the pollution transport, chemical transformations and level to level exchange. The standard EMEP chemical transformation scheme, which considers also non-linear chemical reactions, is included as one of the model options. It accounts for 10 interacting Sulphur, Nitrogen and Ammonia compounds. Because of it’s parametrized vertical structure, the model requires small computer resources, which makes it useful for long time episode (year and more) simulations. The present work aims at presenting the model and demonstrating it’s applicability The comparison of the simulated surface concentrations with data from more than 100 monitoring stations in Bulgaria demonstrates reasonable coincidence.