Accueil > Actualités > Séminaires > Séminaire de Bruno Deremble au LOCEAN


Titre : On the Potential Vorticity Dynamics of Eighteen Degree Water
Nom du conférencier : Bruno Deremble
Son affiliation : Florida State University
Laboratoire organisateur : LOCEAN
Date et heure : 12-05-2015 14h00
Lieu : salle de réunion LOCEAN, tour 45/55, 4eme étage
Résumé :

Mode waters are a distinctive baroclinic feature of the World Ocean characterized by relatively weak vertical stratification. They correspond dynamically to low potential vorticity (PV). In the North Atlantic subtropical gyre, the mode waters have become known as Eighteen Degree Water. Their dynamics involves air-sea interaction, diapycnal and isopycnal mixing, and subduction. Understanding mode water dynamics is therefore both challenging and important since it connects several aspects of the ocean circulation. Mass and PV budget of the mode water's core, evaluated in a realistic primitive equation North Atlantic model, are used to characterize mode water maintenance. It is shown that the surface PV flux has very little impact on mode water; the surface buoyancy flux in combination with eddy mass flux is the most important control on mode water structure. A mean PV formalism is used to show that the PV and water-mass formation budgets are intrinsically linked. A decomposition of the budget demonstrates the role of the mean PV field in permitting the eddy mass flux to discharge the net formation to the surrounding fluid.