Hybrid Variational/Ensemble Data Assimilation combines features from the Ensemble Kalman Filter and Variational assimilation methods to improve the NCEP Global Forecast System. It incorporates ensemble perturbations into the variational cost function, leading to more accurate forecasts. The approach

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This study explores data assimilation strategies for coupled atmosphere-ocean systems using an Ensemble Kalman Filter (EnKF) and a low-order analogue of the climate system. Motivated by the growing interest in near-term climate predictions, the challenges of interacting slow and fast components of t

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