TY - CPAPER AU - D. Fonteyn BT - ECMWF/SPARC Workshop on Modelling and Assimilation for the Stratosphere and Tropopause, 23 to 26 June 2003 CY - Shinfield Park, Reading DA - 2004 LA - eng PB - ECMWF PP - Shinfield Park, Reading PY - 2004 SP - 55 EP - 62 T2 - ECMWF/SPARC Workshop on Modelling and Assimilation for the Stratosphere and Tropopause, 23 to 26 June 2003 TI - Stratospheric chemistry and aerosols ER -