TY - CPAPER AU - D.M. Barker AU - A.M. Clayton BT - Seminar on Data assimilation for atmosphere and ocean, 6-9 September 2011 CY - Shinfield Park, Reading DA - 2012 LA - eng PB - ECMWF PP - Shinfield Park, Reading PY - 2012 SP - 31 EP - 44 T2 - Seminar on Data assimilation for atmosphere and ocean, 6-9 September 2011 TI - Hybrid variational-ensemble data assimilation ER -