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• W2108234032 abstract "Abstract Lagrangian measurements from passive ocean instruments provide a useful source of data for estimating and forecasting the ocean’s state (velocity field, salinity field, etc.). However, trajectories from these instruments are often highly nonlinear, leading to difficulties with widely used data assimilation algorithms such as the ensemble Kalman filter (EnKF). Additionally, the velocity field is often modeled as a high-dimensional variable, which precludes the use of more accurate methods such as the particle filter (PF). Here, a hybrid particle–ensemble Kalman filter is developed that applies the EnKF update to the potentially high-dimensional velocity variables, and the PF update to the relatively low-dimensional, highly nonlinear drifter position variable. This algorithm is tested with twin experiments on the linear shallow water equations. In experiments with infrequent observations, the hybrid filter consistently outperformed the EnKF, both by better capturing the Bayesian posterior and by better tracking the truth." @default.
• W2108234032 created "2016-06-24" @default.
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• W2108234032 date "2015-01-01" @default.
• W2108234032 modified "2023-10-16" @default.
• W2108234032 title "A Hybrid Particle–Ensemble Kalman Filter for Lagrangian Data Assimilation" @default.
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• W2108234032 doi "https://doi.org/10.1175/mwr-d-14-00051.1" @default.
• W2108234032 hasPublicationYear "2015" @default.
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