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• W3104779762 abstract "The iterative ensemble Kalman filter (IEnKF) in a deterministic framework was introduced in Sakov et al. [Mon. Wea. Rev. 140: 1988–2004 ( )] to extend the ensemble Kalman filter (EnKF) and improve its performance in mildly up to strongly nonlinear cases. However, the IEnKF assumes that the model is perfect. This assumption simplified the update of the system at a time different from the observation time, which made it natural to apply the IEnKF for smoothing. In this study, we generalize the IEnKF to the case of an imperfect model with additive model error. The new method called IEnKF‐Q conducts a Gauss–Newton minimization in ensemble space. It combines the propagated analysed ensemble anomalies from the previous cycle and model noise ensemble anomalies into a single ensemble of anomalies, and by doing so takes an algebraic form similar to that of the IEnKF. The performance of the IEnKF‐Q is tested in a number of experiments with the Lorenz'96 model, which show that the method consistently outperforms both the EnKF and the IEnKF naively modified to accommodate additive model noise." @default.
• W3104779762 created "2020-11-23" @default.
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• W3104779762 creator A5045900742 @default.
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• W3104779762 date "2018-02-01" @default.
• W3104779762 modified "2023-10-10" @default.
• W3104779762 title "An iterative ensemble Kalman filter in the presence of additive model error" @default.
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• W3104779762 doi "https://doi.org/10.1002/qj.3213" @default.
• W3104779762 hasPublicationYear "2018" @default.
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