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Model Error Estimation in Ensemble Data Assimilation : Volume 14, Issue 1 (31/01/2007)

By Gillijns, S.

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Book Id: WPLBN0003977969
Format Type: PDF Article :
File Size: Pages 13
Reproduction Date: 2015

Title: Model Error Estimation in Ensemble Data Assimilation : Volume 14, Issue 1 (31/01/2007)  
Author: Gillijns, S.
Volume: Vol. 14, Issue 1
Language: English
Subject: Science, Nonlinear, Processes
Collections: Periodicals: Journal and Magazine Collection, Copernicus GmbH
Historic
Publication Date:
2007
Publisher: Copernicus Gmbh, Göttingen, Germany
Member Page: Copernicus Publications

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Moor, B. D., & Gillijns, S. (2007). Model Error Estimation in Ensemble Data Assimilation : Volume 14, Issue 1 (31/01/2007). Retrieved from http://hawaiilibrary.net/


Description
Description: SCD-SISTA-ESAT, Katholieke Universiteit Leuven, Leuven, Belgium. A new methodology is proposed to estimate and account for systematic model error in linear filtering as well as in nonlinear ensemble based filtering. Our results extend the work of Dee and Todling (2000) on constant bias errors to time-varying model errors. In contrast to existing methodologies, the new filter can also deal with the case where no dynamical model for the systematic error is available. In the latter case, the applicability is limited by a matrix rank condition which has to be satisfied in order for the filter to exist.

The performance of the filter developed in this paper is limited by the availability and the accuracy of observations and by the variance of the stochastic model error component. The effect of these aspects on the estimation accuracy is investigated in several numerical experiments using the Lorenz (1996) model. Experimental results indicate that the availability of a dynamical model for the systematic error significantly reduces the variance of the model error estimates, but has only minor effect on the estimates of the system state. The filter is able to estimate additive model error of any type, provided that the rank condition is satisfied and that the stochastic errors and measurement errors are significantly smaller than the systematic errors. The results of this study are encouraging. However, it remains to be seen how the filter performs in more realistic applications.


Summary
Model error estimation in ensemble data assimilation

Excerpt
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