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Vous êtes ici : Accueil / Actualités / Séminaires / Seminaires Septembre 2017-Aout 2018 / Mercredi 7 Mars - Eddies in the Gulf of Aden and the Gulf of Oman, from the Mesoscale to Submesoscale Interactions

Mercredi 7 Mars - Eddies in the Gulf of Aden and the Gulf of Oman, from the Mesoscale to Submesoscale Interactions

Par SEMSOU Dernière modification 20/02/2018 13:55
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Mathieu Morvan

Laboratoire d'Océanographie Physique et Spatiale - LOPS, Brest

 

Title: Eddies in the Gulf of Aden and the Gulf of Oman, from the Mesoscale to Submesoscale Interactions


Abstract: The Gulf of Oman and the Gulf of Aden are intermediate basins which receive the outflows of salty water from the Persian Gulf and from the Red Sea, but also the waves and eddies from the Arabian Sea. These outflows settle at 250-300m and 600-1000m depths, respectively. The surface eddies in these two gulfs are dynamically deep reaching, and they strongly perturb these deep outflows. In the absence of these eddy fields, these two outflows should follow the coasts of Oman or of Somalia. But these eddies divert their paths away from the coast, advect them along curved trajectories around the eddy rims, elongate these outflows as salty filaments into these two gulfs and finally, can break these filaments into small eddies. First, we will show that during the spring 2011 and 2014, the PhysIndien 2011 and PhysIndien 2014 surveys revealed the presence of submesoscale eddies at the depth of the Persian Gulf Water in the Sea of Oman. In the same periods of time, the altimetry suggests that the surface dynamics was dominated by a row of mesoscale eddies alternatively signed. Thanks to high resolution realistic numerical simulation performed with the HYCOM model over the Gulf of Aden and the Gulf of Oman, we will show the formation of submesoscale eddies and filaments at the surface and at depth and compare such submesoscale dynamics between both regions. Then, we will investigate the lifecycle of small scale eddies and filaments through idealized numerical simulation performed with CROCO at high resolution. Finally, since strong interactions between submesoscale and mesoscale eddies were observed, we will propose to use the Contour-Advective Semi-Lagrangian (non-hydrostatic) algorithm to investigate the full properties of the interaction between a large vortex and a smaller but more intense one.


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