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Application of the Gaussian Anamorphosis to Assimilation in a 3-d Coupled Physical-ecosystem Model of the North Atlantic with the Enkf: a Twin Experiment : Volume 5, Issue 4 (03/11/2009)

By Simon, E.

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Book Id: WPLBN0004020404
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Reproduction Date: 2015

Title: Application of the Gaussian Anamorphosis to Assimilation in a 3-d Coupled Physical-ecosystem Model of the North Atlantic with the Enkf: a Twin Experiment : Volume 5, Issue 4 (03/11/2009)  
Author: Simon, E.
Volume: Vol. 5, Issue 4
Language: English
Subject: Science, Ocean, Science
Collections: Periodicals: Journal and Magazine Collection (Contemporary), Copernicus GmbH
Publication Date:
Publisher: Copernicus Gmbh, Göttingen, Germany
Member Page: Copernicus Publications


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Bertino, L., & Simon, E. (2009). Application of the Gaussian Anamorphosis to Assimilation in a 3-d Coupled Physical-ecosystem Model of the North Atlantic with the Enkf: a Twin Experiment : Volume 5, Issue 4 (03/11/2009). Retrieved from

Description: Nansen Environmental and Remote Sensing Center, Norway. We consider the application of the Ensemble Kalman Filter (EnKF) to a coupled ocean ecosystem model (HYCOM-NORWECOM). Such models, especially the ecosystem models, are characterized by strongly non-linear interactions active in ocean blooms and present important difficulties for the use of data assimilation methods based on linear statistical analysis. Besides the non-linearity of the model, one is confronted with the model constraints, the analysis state having to be consistent with the model, especially with respect to the constraints that some of the variables have to be positive. Furthermore the non-Gaussian distributions of the biogeochemical variables break an important assumption of the linear analysis, leading to a loss of optimality of the filter. We present an extension of the EnKF dealing with these difficulties by introducing a non-linear change of variables (anamorphosis function) in order to execute the analysis step in a Gaussian space, namely a space where the distributions of the transformed variables are Gaussian. We present also the initial results of the application of this non-Gaussian extension of the EnKF to the assimilation of simulated chlorophyll surface concentration data in a North Atlantic configuration of the HYCOM-NORWECOM coupled model.

Application of the Gaussian anamorphosis to assimilation in a 3-D coupled physical-ecosystem model of the North Atlantic with the EnKF: a twin experiment

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