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• W1964660219 abstract "Abstract We present a new ensemble-based approach that handles nonlinearity based on a simplified divided difference approximation through Stirling’s interpolation formula, which is hence called the simplified divided difference filter (sDDF). The sDDF uses Stirling’s interpolation formula to evaluate the statistics of the background ensemble during the prediction step, while at the filtering step the sDDF employs the formulae in an ensemble square root filter (EnSRF) to update the background to the analysis. In this sense, the sDDF is a hybrid of Stirling’s interpolation formula and the EnSRF method, while the computational cost of the sDDF is less than that of the EnSRF. Numerical comparison between the sDDF and the EnSRF, with the ensemble transform Kalman filter (ETKF) as the representative, is conducted. The experiment results suggest that the sDDF outperforms the ETKF with a relatively large ensemble size, and thus is a good candidate for data assimilation in systems with moderate dimensions." @default.
• W1964660219 created "2016-06-24" @default.
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• W1964660219 date "2012-03-01" @default.
• W1964660219 modified "2023-09-24" @default.
• W1964660219 title "On a nonlinear Kalman filter with simplified divided difference approximation" @default.
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• W1964660219 doi "https://doi.org/10.1016/j.physd.2011.12.003" @default.
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