Data assimilation as a nonlinear dynamical systems problem: stability and convergence of the prediction-assimilation system

Carrassi, A. ORCID: https://orcid.org/0000-0003-0722-5600, Ghil, M., Trevisan, A. and Uboldi, F. (2008) Data assimilation as a nonlinear dynamical systems problem: stability and convergence of the prediction-assimilation system. Chaos: An Interdisciplinary Journal of Nonlinear Science, 18 (2). 023112. ISSN 1089-7682 doi: 10.1063/1.2909862

Abstract/Summary

We study prediction-assimilation systems, which have become routine in meteorology and oceanography and are rapidly spreading to other areas of the geosciences and of continuum physics. The long-term, nonlinear stability of such a system leads to the uniqueness of its sequentially estimated solutions and is required for the convergence of these solutions to the system’s true, chaotic evolution. The key ideas of our approach are illustrated for a linearized Lorenz system. Stability of two nonlinear prediction-assimilation systems from dynamic meteorology is studied next via the complete spectrum of their Lyapunov exponents; these two systems are governed by a large set of ordinary and of partial differential equations, respectively. The degree of data-induced stabilization is crucial for the performance of such a system. This degree, in turn, depends on two key ingredients: (i) the observational network, either fixed or data-adaptive, and (ii) the assimilation method.

Item Type	Article
URI	https://reading-clone.eprints-hosting.org/id/eprint/89727
Item Type	Article
Refereed	Yes
Divisions	Science > School of Mathematical, Physical and Computational Sciences > Department of Meteorology
Publisher	American Institute of Physics
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