Dynamical Gaussian, lognormal, and reverse lognormal maximum‐likelihood ensemble filter
Senne Van Loon,
Steven J. Fletcher,
Milija Zupanski
Abstract:We present a non‐Gaussian ensemble data assimilation method based on the maximum‐likelihood ensemble filter, which allows for any combination of Gaussian, lognormal, and reverse lognormal errors in both the background and the observations. The technique is fully nonlinear, does not require a tangent linear model, and uses a Hessian preconditioner to minimise the cost function efficiently in ensemble space. When the Gaussian assumption is relaxed, the results show significant improvements in the analysis skill … Show more
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