Fronts of the Malvinas Current System: surface and subsurface expressions revealed by satellite altimetry, Argo floats, and Mercator operational model outputs - Archive ouverte HAL Accéder directement au contenu
Article Dans Une Revue Journal of Geophysical Research. Oceans Année : 2018

Fronts of the Malvinas Current System: surface and subsurface expressions revealed by satellite altimetry, Argo floats, and Mercator operational model outputs

Résumé

We examine the surface and subsurface signature of ocean fronts closely associated with theMalvinas Current dynamics. We first evaluate the performances of the Mercator Ocean eddy permitting (1/12°spatial resolution) global operational system in the southwestern Atlantic Ocean over the last 10 years (2007–2016) using satellite, Argo float and in situ data collected near 41°S. Observations versus model comparisons show that the model correctly reproduces the general circulation and the complex hydrographic features ofthe study area including the vicinity of the Brazil-Malvinas Confluence. The model outputs accurately match the observations except in June 2015. The causes for the June 2015 mismatch are analyzed. We then used themodel and satellite altimetry to identify isolines of absolute dynamic topography (ADT) and potential densityat different depths associated with the mean front location and establish their correspondence with specificwater mass boundaries. Frontal displacements as depicted in satellite ADT, model ADT, and model potential density at 450 m are in general agreement. The ADT and potential density at 450 m provide nonidentical and complementary information on eddies shed by the Polar Front (PF): while ADT depicts the surface circulation with PF eddies entrained into the energetic circulation over the deep Argentine Basin, potential density at 450 m is more effective at monitoring PF eddies feeding the Malvinas Current.
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hal-02190673 , version 1 (04-01-2022)

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Camila Artana, Jean-Michel Lellouche, Young-Hyang Park, Gilles Garric, Zoé Koenig, et al.. Fronts of the Malvinas Current System: surface and subsurface expressions revealed by satellite altimetry, Argo floats, and Mercator operational model outputs. Journal of Geophysical Research. Oceans, 2018, 123 (8), pp.5261-5285. ⟨10.1029/2018JC013887⟩. ⟨hal-02190673⟩
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