TY - GEN AU - Carla Cardinali AU - Erik Andersson AU - P. Viterbo AU - Jean-Noël Thépaut AU - Drasko Vasiljevic BT - ECMWF Technical Memoranda CY - Shinfield Park, Reading DA - 11/1994 DO - 10.21957/p6p470k5x LA - eng M1 - 207 PB - ECMWF PP - Shinfield Park, Reading PY - 1994 EP - 31 T2 - ECMWF Technical Memoranda TI - Use of conventional surface observations in three-dimensional variational assimilation UR - https://www.ecmwf.int/node/8577 ER -