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            <gco:CharacterString>La Topographie Dynamique Moyenne MDT-CNES-CLS2022 est une estimation de la moyenne sur la période 1993-2012 de la hauteur de la surface de la mer au-dessus du géoïde. Utilisation du dernier modèle de géoïde GOCO06S (basé sur la mission GOCE entièrement retraitée et 14 ans de données GRACE) et 30 ans de données altimétriques et in-situ (hydrologiques, dériveurs et radar Haute Fréquence sur une zone limitée).

La topographie dynamique moyenne (MDT) est une surface de référence essentielle pour l'altimétrie. Elle est nécessaire au calcul de la topographie dynamique absolue de l'océan, et dans l'approximation géostrophique, à l'estimation des courants de surface.  

Cette nouvelle Topographie Dynamique Moyenne combinée MDT CNES-CLS22 régionale définit de meilleurs courants près de la côte, estimés à partir de données in situ radars haute fréquence (HF).

Les différentes étapes de calcul de la MDT CNES-CLS22 :
a) Dans un premier temps, 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.
b) 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. 
c) 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.
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                              <gco:Date>2024-09-16</gco:Date>
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                     <gmd:textGroup>
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                  <gco:CharacterString>Citation : Any use of this dataset must cite its reference: DOI https://doi.org/10.24400/527896/a01-2023.003</gco:CharacterString>
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                        <gml:TimePeriod gml:id="d82125312e505a1051934">
                           <gml:beginPosition>1993-01-01</gml:beginPosition>
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                        <gmd:LocalisedCharacterString locale="#FR">NetCDF</gmd:LocalisedCharacterString>
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                        <gmd:URL>https://tds-odatis.aviso.altimetry.fr/thredds/catalog/auxiliary/AUXILIARY-MDT.html</gmd:URL>
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               <gmd:statement xsi:type="lan:PT_FreeText_PropertyType">
                  <gco:CharacterString>Contenu: moyenne sur la période 1993-2018 de la hauteur de mer par rapport au géoïde. La MDT_CNES-CLS18 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
- Mulet, S., Rio, M.-H., Etienne, H., Artana, C., Cancet, M., Dibarboure, G., Feng, H., Husson, R., Picot, N., Provost, C., and Strub, P. T.: The new CNES-CLS18 Global Mean Dynamic Topography, Ocean Sci., 17, 789-808, https://doi.org/10.5194/os-17-789-2021, 2021 
- Mulet et al., "The new CNES-CLS18 Mean Dynamic Topography", OceanPredict'19. https://www.godae.org/~godae-data/OP19/posters/P9-Poster_MDT18.pdf
- Rio et al., "New CNES-CLS18 Mean Dynamic Topography of the global ocean from altimetry, gravity and ins-situ data, OSTST 2018 https://meetings.aviso.altimetry.fr/fileadmin/user_upload/GEO_05_Rio.pdf</gco:CharacterString>
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