Institut Méditerranéen d’Océanologie
Accueil du site > Agenda > Nos séminaires > Séminaire MIO : Rappel/Pierre Garreau, Chercheur à Ifremer, animera un (...)

Séminaire MIO : Rappel/Pierre Garreau, Chercheur à Ifremer, animera un séminaire intitulé : Observation haute résolution d’un tourbillon à deux coeurs dans le Front des Baléares (P. Garreau /F. Dumas /S. Louazel/A. Stegener/B. Le Vu)

Version imprimable de cet article

Lundi 20 novembre, à 13h, dans l’amphithéâtre Océanomed à Luminy

Ci-après le résumé (en anglais) pour un exposé (en français).

High resolution in situ observations and tracking of a dual core anticyclonic eddy in the North Balearic Front .
Pierre Garreau (IFREMER/LOPS), F. DUMAS et S. Louazel (SHOM), A. Stegener et B Le Vu (LMD, CNRS, Ecole Polytechnique)

The mesoscale dynamics in the Mediterranean sea has been investigated for years and anticyclonic eddies are recurrent and regularly observed features in the Algerian Basin. Thanks to the AMEDA eddy detection algorithm a particular anticyclonic eddy was tracked and monitored from its birth to its death. The analysis of remote sensing data sets (AVISO and SST) reveals that this anticyclone splits from an Algerian Eddy in October 2015, interacts with the North Balearic Front and merge seven months later, in May 2016, with the same Algerian Eddy. During the early spring of 2016, the field experiment ProtevsMed 2016 had thoroughly investigated this specific eddy, when it was located next to the Balearic front. High resolution hydrological transects, several CTD casts and LADCP measurements were performed. In addition, four surface drifting buoys were released in the eddy core. Theses in-situ measurements reveals that the vertical structure of this anticyclone was made of two water lenses from very different origin (Atlantic Water (AW) above and Western Intermediate Water (WIW) bellow) spinning together. In the vicinity of the North Balearic Front, the eddy interacts with a subsurface anticyclonic eddy made of modal water which might act both as a dynamical barrier and foster cross-front exchanges. The high resolution sampling reveals fine structures both aside the eddy and within its core ; they might be related to sub-mesoscale processes (O(1km)).