TY - CPAPER AU - Peter Bauer BT - ECMWF Workshop on Diagnostics of data assimilation system performance, 15 - 17 June 2009 CY - Shinfield Park, Reading DA - 2009 LA - eng PB - ECMWF PP - Shinfield Park, Reading PY - 2009 SP - 81 EP - 87 T2 - ECMWF Workshop on Diagnostics of data assimilation system performance, 15 - 17 June 2009 TI - Observing System Experiments (OSE) to estimate the impact of observations in NWP ER -