Towards advection on a full reduced grid for TM5

In this report we describe generalizations which have been made to the advection scheme of the TM5 chemistry-transport model. TM5 [Krol et al., 2005] is a global atmospheric model used by an international research community for the purpose of long range transport of chemical species and their subsequent effect on the regional atmosphere.The model is driven by meteorological fields originating from the IFS operational model used at ECMWF (European Center for Medium-range Weather Forecast). The data is stored offline as a pre-processed input and updated every 3 or 6 hours.