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TitreThe mean surface circulation of the North Atlantic subpolar gyre: A comparison of estimates derived from new gravity and oceanographic measurements
AuteurHigginson, S; Thompson, K R; Huang, J; Véronneau, M; Wright, D G
SourceJournal of Geophysical Research vol. 116, C08016, 2011 p. 1-14, (Accès ouvert)
Séries alt.Secteur des sciences de la Terre, Contribution externe 20110378
Documentpublication en série
Mediapapier; en ligne; numérique
ProvinceRégion extracotière de l'est
Lat/Long OENS-60.0000 -20.0000 68.0000 44.0000
Sujetslevés océanographiques; océanographie; courants dirigés vers le large; courants; levés géophysiques; gravité; levés gravimétriques; géologie marine; géophysique
Illustrationslocation maps
Diffusé2011 08 20
Résumé(disponible en anglais seulement)
A new mean sea surface topography (MSST) is used to estimate the surface circulation of the subpolar gyre of the northwest Atlantic. The MSST is produced using a new geoid model derived from a blend of gravity data from the Gravity Recovery and Climate Experiment (GRACE) satellite mission, satellite altimeters, and terrestrial measurements. The MSST is compared with a topography produced by an ocean model which is spectrally nudged to a new Argo period temperature and salinity climatology. The mean surface circulation associated with the geodetic MSST is compared with estimates of the circulation from surface drifters, moorings, and other in situ measurements. The geodetic MSST and circulation estimate are found to be in good agreement with the other estimates, both qualitatively and quantitatively. The topography is found to be an improvement over an earlier geodetic estimate with better resolution of the coastal currents. Deficiencies are identified in the ocean model's estimate of flow over shelf regions.