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                  <gco:CharacterString>Cette version MDT CNES-CLS22 prend en compte le dernier modèle de géoide GOCO06S (basé sur la mission complète GOCE et 14 années de données de la mission GRACE)  et 30 années de données altimétriques et de données in situ (hydrologiques, bouées dérivantes et radar Haute Fréquence sur une zone restreinte)

Contenu: moyenne sur la période 1993-2018 de la hauteur de mer par rapport au géoïde. La MDT_CNES-CLS22 est une estimation de la topographie dynamique moyenne sur la période [1993-2012]. Cette version est calculée sur une nouvelle période de référence de 20 ans [1993-2012] qui correspond à celle de la précédente version (MDT_CNES-CLS13) et compatible à la période de référence des produits CMEMS (Produits altimétriques global MSLA et MADT - Hauteurs et courants - (multimissions, niveau 4).
Utilisation: étude de la circulation océanique, océanographie opérationnelle
Description: produit combiné utilisant 4 années de données GOCE, 10.5 années de données de la mission GRACE, ainsi que 25 années de données altimétriques et 23 années de données in-situ (hydrologiques, bouées dérivantes).

Dans un premier temps, on effectue une ébauche ou first guess: à méso-échelle en utilisant seulement les données satellites, altimétriques et de gravimétrie. La différence brute entre la surface moyenne MSS et le modèle de géoide est filtrée avec un filtre optimal afin de retirer le bruit et le signal géodésique résiduel.
D'autre part on calcule une estimation synthétique (synthetic estimate) de la MDT et des courants géostrophiques avec les données océaniques in situ (profils T/S et bouées dérivantes)
Dans un premier temps les données sont traitées de manière à avoir le même contenu physique que les données altimétriques :
Les données des bouées dérivantes (SVP et ARGO dérivant en surface) sont traitées de manière à n'extraire que la composante géostrophique.
Les composantes barotropes et baroclines sont aussi ajoutées à la hauteur dynamique calculée à partir des profils T/S.
Les anomalies du niveau de la mer sont interpolées et soustraites aux  mesures in situ faites sur l'océan afin d'estimer une MDT moyenne et les vitesses géostrophiques moyennes de surface correpondantes. 
Ensuite en utilisant une méthode d'analyse objective multivariée, l'estimation synthétique des hauteurs moyennes et des vitesses moyennes sont combinées pour effectuer une première ébauche de la MDT.
Enfin, on effectue une validation en comparant la MDT obtenue aux autres versions de la MDT et des données in situ indépendantes.

Références
- Jousset S., Mulet S., Wilkin J., Greiner E., Dibarboure G. and Picot N.: “New global Mean Dynamic Topography CNES-CLS-22 combining drifters, hydrological profiles and High Frequency radar data”, OSTST 2022, https://doi.org/10.24400/527896/a03-2022.3292.</gco:CharacterString>
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