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            <gco:CharacterString>La Topographie Dynamique moyenne (MDT - Mean Dynamic Topography) résulte d'une moyenne des hauteurs de mer (SSH Sea Surface Height) au-dessus du géoïde sur une période de référence, ici la période1993-2012.

La topographie dynamique moyenne hybride contient la MDT-CNES-CLS18 pour la couverture globale et la MDT CMEMS 2020 pour la mer Noire (MDT-CMEMS2020-BLK) et la mer Méditerranée (MDT-CMEMS2020-MED).

La MDT hybride MDT-HYBRID-CNES-CLS18-CMEMS2020 est un produit combiné utilisant les données de la mission complète de GOCE (nov. 2009- oct. 2013), 10.5 années de données de la mission GRACE, ainsi que 25 années de données altimétriques (1993-2018) et 23 années de données in-situ (hydrologiques 1993-2016, bouées dérivantes 1997-2016).

La méthode utilisée pour calculer la topographie dynamique moyenne est similaire à celle utilisée dans les versions précédentes de la MDT CNES-CLS. Une description détaillée peut être trouvée dans Rio et Hernandez, 2004, Rio et al, 2011, Rio et al, 2014a. Il s'agit d'une approche en trois étapes.

1/ Dans une première étape, une solution MDT de première approximation est calculée à partir des différences filtrées de manière optimale entre une surface moyenne de la mer (MSS) altimétrique et un modèle de géoïde.

2/ Dans la deuxième étape de la méthode, des estimations synthétiques de la MDT et des vitesses géostrophiques moyennes sont calculées en utilisant des mesures in-situ des hauteurs dynamiques de l'océan et des vitesses de surface. Les mesures in situ sont d'abord traitées de manière à extraire la composante géostrophique uniquement des vitesses totales des bouées dérivantes, et à compléter les hauteurs dynamiques avec les composantes barotropes et baroclines profondes manquantes. La variabilité temporelle des hauteurs et des vitesses mesurées est ensuite éliminée en soustrayant respectivement les anomalies de niveau de la mer et de vitesse géostrophique de l'altimètre. Les mesures in-situ traitées sont ensuite moyennées dans des boîtes pour obtenir respectivement les hauteurs et les vitesses moyennes synthétiques.

3/ dans la troisième étape, 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.</gco:CharacterString>
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               <gmd:level>
                  <gmd:MD_ScopeCode codeList="http://standards.iso.org/iso/19115/resources/Codelists/cat/codelists.xml#MD_ScopeCode"
                                    codeListValue="dataset"/>
               </gmd:level>
            </gmd:DQ_Scope>
         </gmd:scope>
         <gmd:lineage>
            <gmd:LI_Lineage>
               <gmd:statement xmlns:gco="http://standards.iso.org/iso/19115/-3/gco/1.0" gco:nilReason="missing"
                              xsi:type="lan:PT_FreeText_PropertyType">
                  <gco:CharacterString xmlns:gco="http://www.isotc211.org/2005/gco"/>
               </gmd:statement>
               <gmd:source uuidref="b01f1bbb-c04f-42e2-8e22-6367081c368f"
                           xlink:title="Topographie Dynamique Moyenne MDT"
                           xlink:href="https://sextant.ifremer.fr/geonetwork/srv/fre/csw?service=CSW&amp;request=GetRecordById&amp;version=2.0.2&amp;outputSchema=http://www.isotc211.org/2005/gmd&amp;elementSetName=full&amp;id=b01f1bbb-c04f-42e2-8e22-6367081c368f"/>
            </gmd:LI_Lineage>
         </gmd:lineage>
      </gmd:DQ_DataQuality>
  </gmd:dataQualityInfo>
</gmd:MD_Metadata>