TY - CPAPER AU - S. Saarinen AU - N. Sokka BT - Workshop on Re-analysis, 5-9 November 2001 CY - Shinfield Park, Reading DA - 2001 LA - eng M1 - 3 PB - ECMWF PP - Shinfield Park, Reading PY - 2001 SP - 71 EP - 88 T2 - Workshop on Re-analysis, 5-9 November 2001 T3 - ERA-40 Project Report Series TI - Merging of the observation sources ER -