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Data Assimilation Experiments Using the Diffusive Back and Forth Nudging for the Nemo Ocean Model : Volume 1, Issue 2 (16/07/2014)

By Ruggiero, G. A.

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Book Id: WPLBN0004020061
Format Type: PDF Article :
File Size: Pages 59
Reproduction Date: 2015

Title: Data Assimilation Experiments Using the Diffusive Back and Forth Nudging for the Nemo Ocean Model : Volume 1, Issue 2 (16/07/2014)  
Author: Ruggiero, G. A.
Volume: Vol. 1, Issue 2
Language: English
Subject: Science, Nonlinear, Processes
Collections: Periodicals: Journal and Magazine Collection (Contemporary), Copernicus GmbH
Publication Date:
Publisher: Copernicus Gmbh, Göttingen, Germany
Member Page: Copernicus Publications


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Auroux, D., Ruggiero, G. A., Blum, J., Cosme, E., Verron, J., & Ourmières, Y. (2014). Data Assimilation Experiments Using the Diffusive Back and Forth Nudging for the Nemo Ocean Model : Volume 1, Issue 2 (16/07/2014). Retrieved from

Description: Université de Nice Sophia-Antipolis/LJAD, Nice, France. The Diffusive Back and Forth Nudging (DBFN) is an easy-to-implement iterative data assimilation method based on the well-known Nudging method. It consists in a sequence of forward and backward model integrations, within a given time window, both of them using a feedback term to the observations. Therefore in the DBFN, the Nudging asymptotic behavior is translated into an infinite number of iterations within a bounded time domain. In this method, the backward integration is carried out thanks to what is called backward model, which is basically the forward model with reversed time step sign. To maintain numeral stability the diffusion terms also have their sign reversed, giving a diffusive character to the algorithm. In this article the DBFN performance to control a primitive equation ocean model is investigated. In this kind of model non-resolved scales are modeled by diffusion operators which dissipate energy that cascade from large to small scales. Thus, in this article the DBFN approximations and their consequences on the data assimilation system set-up are analyzed. Our main result is that the DBFN may provide results which are comparable to those produced by a 4Dvar implementation with a much simpler implementation and a shorter CPU time for convergence.

Data assimilation experiments using the diffusive back and forth nudging for the NEMO ocean model

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