Variabilité Interannuelle à Décennale en Atlantique Nord et Mers Nordiques. Etude conjointe d'Observations, de Simulations Numériques et de Réanalyses

Abstract : This work aims to characterise and quantify the differences between large-scale oceanic climatic indices simulated by a 9-member set of realistic numerical ocean models (five hindcasts and four reanalyses). The focus is on the North Atlantic region. The following climatic indices : meridional overturning circulation and meridional heat transport, are diagnosed in the various models. The models are run over a common period of nine years. The focus of this study is climatic variability at interannual scales. The influence of numerical parameters, such as spatial configuration and resolution, and the influence of various sequential data assimilation schemes, are evaluated. We evaluate them through comparison with observed large-scale climatic indices. The model solutions exhibit a strong diversity concerning the averaged values and the temporal variations of the meridional volume and heat transports. The ocean reanalyses considered in this study, although constrained towards an observed ocean, do not converge towards the coherent large-scale climatic indices. These reanalyses are not coherent, neither between each other, nor compared to available observational estimations, underlying the difficulty to simulate coherent large-scale climatic indices with local data assimilation.
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https://tel.archives-ouvertes.fr/tel-00470520
Contributor : Albanne Lecointre <>
Submitted on : Tuesday, April 6, 2010 - 5:34:34 PM
Last modification on : Thursday, January 3, 2019 - 4:30:08 PM
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Albanne Lecointre. Variabilité Interannuelle à Décennale en Atlantique Nord et Mers Nordiques. Etude conjointe d'Observations, de Simulations Numériques et de Réanalyses. Océan, Atmosphère. Université Joseph-Fourier - Grenoble I, 2009. Français. ⟨tel-00470520⟩

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