Development of a high resolution integrated nested model for studying air pollution in Denmark

Abstract

A 3-D Eulerian transport-chemistry model, REGINA (REGIonal high resolutionN Air pollution model), based on models developed over the last decade at the National Environmental Research Institute (DREAM, DEHM, ACDEP and DEOM) is currently under development. The model will be applied to studies of air pollution phenomena (both monitoring, forecasts and scenarios) over Denmark, where there are extensive coastal areas that require a high resolution model in order to resolve the effects of e.g. land-sea interactions. The goal is to obtain a nested grid model capable of high resolution operation. It is very important to implement numerical methods suited for the high model resolution in order to make sure that significant errors are not introduced by the numerics. In this paper the model concepts of REGINA will be described. Special attention will be on the numerical methods and numerical test results concerning the advection and chemistry. Furthermore examples of model results and some preliminary validations with measurements from EMEP will be shown. The numerical test results show, that the methods chosen for the model are very accurate with small numerical errors. The next step will be to implement high resolution input data (emission, land use and meteorological data) and physical parameterisations.