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Data assimilation by delay-coordinate nudging

AuthorsPazó, Diego ; Carrassi, A.; López, Juan M.
Data assimilation
Issue Date2016
PublisherJohn Wiley & Sons
Royal Meteorological Society (Great Britain)
CitationQuarterly Journal of the Royal Meteorological Society 142(696): 1290-1299 (2016)
AbstractA new nudging method for data assimilation, delay-coordinate nudging, is presented. Delay-coordinate nudging makes explicit use of present and past observations in the formulation of the forcing driving the model evolution at each time step. Numerical experiments with a low-order chaotic system show that the new method systematically outperforms standard nudging in different model and observational scenarios, also when using an unoptimized formulation of the delay-nudging coefficients. A connection between the optimal delay and the dominant Lyapunov exponent of the dynamics is found based on heuristic arguments and is confirmed by the numerical results, providing a guideline for the practical implementation of the algorithm. Delay-coordinate nudging preserves the easiness of implementation, the intuitive functioning and the reduced computational cost of the standard nudging, making it a potential alternative especially in the field of seasonal-to-decadal predictions with large Earth system models that limit the use of more sophisticated data assimilation procedures.
Publisher version (URL)https://doi.org/10.1002/qj.2732
Identifiersdoi: 10.1002/qj.2732
e-issn: 1477-870X
issn: 0035-9009
Appears in Collections:(IFCA) Artículos
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