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Echanges indo-atlantiques d'eau subtropicale en relation aux structures frontales et de méso-échelle: Utilisation de la série temporelle altimétrique de niveau de la mer ArchiMer
Dencausse, Guillaume.
Indo-Atlantic exchanges of subtropical water play a crucial role in controlling global climate. The intense mesoscale activity south of Africa contributes to these exchanges, yet remains poorly described. A commonly accepted circulation scheme of those waters assmues that the subtropical gyres of the neighbouring oceans are partially connected, forming a super-gyre. Using an altimeter-derived sea-level time series spanning over 12 years, we study the exchanges through the "northern branch" of the super-gyre (Indian to Atlantic ocean), and through the "southern branch" (opposite direction). Regarding the northern branch, an initial study of the Agulhas Current Retroflection yields a statistical description of its behaviour, and shows the disrupting role of...
Tipo: Text Palavras-chave: Courant des Aiguilles; Anneaux des Aiguilles; Front Subtropical; Retroflection; Altimétrie; Échanges indo-atlantiques; Mésoéchelle; Agulhas Current; Agulhas Rings; 3subtropical Front; Retroflection; Altimetry; Indo-atlantic exchanges; Mesoscale.
Ano: 2009 URL: http://archimer.ifremer.fr/doc/00030/14091/11310.pdf
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Anticyclonic eddies connecting the western boundaries of Indian and Atlantic oceans ArchiMer
Laxenaire, R.; Speich, S.; Blanke, Bruno; Chaigneau, A.; Pegliasco, C.; Stegner, A..
The Indo‐Atlantic interocean exchanges achieved by Agulhas Rings are tightly linked to global ocean circulation and climate. Yet, they are still poorly understood because they are difficult to identify and follow. We propose here an original assessment on Agulhas Rings, achieved by TOEddies, a new eddy identification and tracking algorithm that we applied over 24 years of satellite altimetry. Its main novelty lies in the detection of eddy splitting and merging events. These are particularly abundant and significantly impact the concept of a trajectory associated with a single eddy, which becomes less obvious than previously admitted. To overcome this complication, we have defined a network of segments that group together in relatively complex trajectories....
Tipo: Text Palavras-chave: Agulhas Rings; Eddy tracking; Interocean exchange; Mesoscale dynamics.
Ano: 2018 URL: https://archimer.ifremer.fr/doc/00463/57516/59682.pdf
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