TY - CPAPER AU - A. McDonald BT - Seminar on Recent Developments in Numerical Methods for Atmospheric Modelling, 7-11 September 1998 CY - Shinfield Park, Reading DA - 1998 LA - eng PB - ECMWF PP - Shinfield Park, Reading PY - 1998 SP - 308 EP - 334 T2 - Seminar on Recent Developments in Numerical Methods for Atmospheric Modelling, 7-11 September 1998 TI - The origin of noise in semi-Lagrangian integrations ER -