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                        <gmd:LocalisedCharacterString locale="#EN">FSLE - Maps of Finite Size Lyapunov Exponents and Orientations of the associated eigenvectors</gmd:LocalisedCharacterString>
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            <gco:CharacterString>Produit grillé multimission altimétrique dérivé des produits Ssalto/Duacs. Exponents de Lyapunov de taille finie et orientations des vecteurs propres associés: Finite-Size Lyapunov Exponents (FSLE).

Les cartes FSLE fournissent le taux exponentiel de séparation des trajectoires de particules initialisées à proximité et advectées par les courants altimétriques. Les FSLE mettent en évidence les barrières de transport qui contrôlent les échanges horizontaux d'eau dans et en dehors du centre des tourbillons. 

Les grandes valeurs de FSLE identifient les régions où l'étirement induit par les vitesses de mésoéchelle détectées par l'altimétrie est important. Les grandes valeurs de FSLE sont typiquement organisées en lignes convoluées encerclant des filaments de (sous-)mésoéchelle. Les lignes de FLSE sont souvent en bon accord avec les filaments de traceurs biogéochimiques (couleur de l'océan, température de surface de la mer,...) affectés par l'advection horizontale. 
Les filaments observés dans les images de traceurs correspondent à des trajectoires stables (contraction) de l'écoulement où l'étirement est fort. Lorsqu'ils sont calculés en utilisant une advection à rebours dans le temps, les FSLE montrent également des lignes convoluées encerclant des filaments à méso-échelle qui sont souvent en bon accord avec les structures principales de la distribution des traceurs biologiques.

Les FSLE en temps différé (DT FSLE) sont calculés à partir des produits de vitesses géostrophiques de la topographie dynamique absolue (ADT) du niveau de la mer (niveau 4) fournis par le Copernicus Marine Service (https://doi.org/10.48670/moi-00149). En temps différé, les cartes sont calculées chaque jour depuis le 1994/04/01 et mises à jour chaque année.
Les produits FLSE en temps quasi-réel (NRT FSLE) sont basés sur des produits de vitesses géostrophiques SEA LEVEL Absolute Dynamic Topography (ADT) interne (ou niveau 4), en utilisant les mêmes corrections qu'en temps différé.  En temps quasi réel, les cartes sont livrées chaque jour, avec 20 jours de délai. 

Les produits livrés sont calculés selon la méthode détaillée dans d'Ovidio et al. 2004. Le code a été développé en collaboration entre LOCEAN (F. d'Ovidio) et CLS, et est disponible sous licence publique générale GNU. Le code source est également distribué en open source si vous avez l'intention d'appliquer vos propres paramètres et/ou dans un domaine régional (voir la description complète de la méthode et de la livraison du code dans les Ressources ci-dessous). Pour utiliser le code, veuillez citer : « Le code utilisé pour calculer les exposants de Lyapunov de taille finie a été développé en collaboration entre LOCEAN (F. d'Ovidio) et CLS, et est disponible sous licence publique générale GNU ».</gco:CharacterString>
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