TY - JOUR A1 - Bonavita, M. A1 - Lean, P. A1 - Holm, E. T1 - Nonlinear effects in 4D-Var JO - Nonlin. Processes Geophys. J1 - NPG VL - 25 IS - 3 SP - 713 EP - 729 Y1 - 2018/09/19 PB - Copernicus Publications SN - 1607-7946 UR - https://npg.copernicus.org/articles/25/713/2018/ L1 - https://npg.copernicus.org/articles/25/713/2018/npg-25-713-2018.pdf DO - 10.5194/npg-25-713-2018 ER -