1. TM5 stratosphere research chemistry  gas phase: implemented (BB)  photolysis: debugging (M. van Weele)  heterogeneous chemistry: implementing stage (BB) ozone-tracer (T. van Noije, J. de Laat) SF6-CO2 (H. Boenisch) PSC algorithm (M. van den Broek, J. Williams) kzz online: implemented (BB, M. van Weele) flexible vertical levels: implemented (BB, M. van Weele) second-moments advection: implemented (BB) pre-processing: pv - theta - equivalent latitude fields (A. Segers and BB) TM5 - ECHAM coupling (F. Alkemade, M. Sigmond)

2. Stratospheric chemistry both tropospheric (cbm4 up to c3 nmhc) and stratospheric chemistry, including N and H radical chemistry (upper stratosphere) Prescribed ground constraints of CFCs and N2O, using polynomial fits from CMDL data no SO2 chemistry, SO4 tropospheric fields prescribed (monthly mean). Prescribed stratospheric SAD data from SAGE-II and III

3. TM5 - ECHAM coupling TM5 pre-processing suitable to use ECHAM5 meteorological fields. First results: december 2003 (F. Alkemade) Use of TM5 tracer fields in ECHAM5 (M. Sigmond, start: january 2004) To be investigated: sensitivity towards TM5 tracer interpolation; ECHAM meteorology update frequency