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            <gco:CharacterString>La surface moyenne océanique (Mean Sea Surface MSS, en anglais) est un élément important en océanographie physique, en géophysique et en géodésie. 
Elle correspond à la hauteur moyenne stable, de la surface de l'océan..
Le produit MSS CNES CLS est un produit altimétrique auxiliaire représentant la hauteur moyenne de l'océan par rapport à l'ellipsoïde de référence T/P ou WGS84. Cette surface est fournie sur une grille régulière (1/60°x1/60°, 1 minute). Une grille d'erreur d'estimation est également fournie.
La Surface Moyenne Océanique MSS_CNES_CLS2022 a été calculée sur une période de 29 ans [1993-2021] de données altimétriques.

Par rapport à la version précédente de 2015, cette nouvelle détermination porte sur une meilleure prise en compte de la variabilité océanique interannuelle et saisonnière, sur l'amélioration significative dans les océans polaires, et sur l'amélioration des longueurs d'onde plus courtes des parties statiques de la MSS.

Comme d'habitude, les profils moyens des missions ERM (Exact Repeat Mission) qui fournissent l'estimation la plus précise du contenu océanique moyen sont utilisés. Par rapport à la version précédente MSS CNES_CLS2015, cette version inclut de nouveaux jeux de données Haute Résolution de CryoSat-2 et AltiKa, filtrés à 5 Hz pour obtenir un meilleur rapport signal sur bruit.
Cette nouvelle solution est également améliorée dans l'Océan Arctique en utilisant une combinaison optimale entre les SSH conventionnelles et les LEADS (fractures linéaires) sur les zones de glace libre.</gco:CharacterString>
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