TY - CPAPER AU - T. Ackerman BT - ECMWF/EUMETSAT NWP-SAF Workshop on Bias estimation and correction in data assimilation, 8 to 11 November 2005. CY - Shinfield Park, Reading DA - 2006 LA - eng PB - ECMWF PP - Shinfield Park, Reading PY - 2006 SP - 77 EP - 92 T2 - ECMWF/EUMETSAT NWP-SAF Workshop on Bias estimation and correction in data assimilation, 8 to 11 November 2005. TI - Using validation sites and field campaigns to evaluate observational and model bias ER -