Hybrid Levenberg–Marquardt and weak-constraint ensemble Kalman smoother method
Hybrid Levenberg–Marquardt and weak-constraint ensemble Kalman smoother method
Abstract. The ensemble Kalman smoother (EnKS) is used as a linear least-squares solver in the Gauss–Newton method for the large nonlinear least-squares system in incremental 4DVAR. The ensemble approach is naturally parallel over the ensemble members and no tangent or adjoint operators are needed. Furthermore, adding a regularization term results …