TY - JOUR A1 - Terwisscha van Scheltinga, A. D. A1 - Dijkstra, H. A. T1 - Efficient estimation of time-mean states of ocean models using 4D-Var and implicit time-stepping JO - Nonlin. Processes Geophys. J1 - NPG VL - 14 IS - 6 SP - 777 EP - 788 Y1 - 2007/11/30 PB - Copernicus Publications SN - 1607-7946 UR - https://npg.copernicus.org/articles/14/777/2007/ L1 - https://npg.copernicus.org/articles/14/777/2007/npg-14-777-2007.pdf DO - 10.5194/npg-14-777-2007 ER -