TY - CPAPER AU - P. Gauthier AU - M. Buehner AU - L. Fillion BT - Workshop on Diagnosis of Data Assimilation Systems, 2 - 4 November 1998 CY - Shinfield Park, Reading DA - 1999 LA - eng PB - ECMWF PP - Shinfield Park, Reading PY - 1999 SP - 131 EP - 146 T2 - Workshop on Diagnosis of Data Assimilation Systems, 2 - 4 November 1998 TI - Background-error statistics modelling in a 3D variational data assimilation scheme estimation and impact on the analyses ER -