Impacts of the Mesoscale Ocean-Atmosphere Coupling on the Peru-Chile Ocean Dynamics: The Current-Induced Wind Stress Modulation

Véra Oerder 1 François Colas 1 Vincent Echevin 1 Sébastien Masson 1 Florian Lemarié 2
1 NEMO R&D - Nucleus for European Modeling of the Ocean
LOCEAN - Laboratoire d'Océanographie et du Climat : Expérimentations et Approches Numériques
2 AIRSEA - Mathematics and computing applied to oceanic and atmospheric flows
Grenoble INP - Institut polytechnique de Grenoble - Grenoble Institute of Technology, UGA - Université Grenoble Alpes, LJK - Laboratoire Jean Kuntzmann, Inria Grenoble - Rhône-Alpes
Abstract : The ocean dynamical responses to the surface current-wind stress interaction at mesoscale are investigated in the South-East Pacific using a high-resolution regional ocean–atmosphere coupled model. Two simulations are compared: one includes the surface current in the wind stress computation while the other does not. In the coastal region, absolute wind velocities are different between the two simulations but the wind stress remains very similar. As a consequence, the mean regional oceanic circulation is almost unchanged. On the contrary, the mesoscale activity is strongly reduced when taking into account the effect of the surface current on the wind stress. This is caused by a weakening of the eddy kinetic energy generation near the coast by the wind work and to intensified offshore eddy damping. We show that, above coherent eddies, the current-stress interaction generates eddy damping through Ekman pumping and eddy kinetic energy dissipation through wind work. This alters significantly the coherent eddy vertical structures, weakening the temperature and vorticity anomalies and increasing strongly the vertical velocity anomalies associated to eddies.
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Véra Oerder, François Colas, Vincent Echevin, Sébastien Masson, Florian Lemarié. Impacts of the Mesoscale Ocean-Atmosphere Coupling on the Peru-Chile Ocean Dynamics: The Current-Induced Wind Stress Modulation. Journal of Geophysical Research. Oceans, Wiley-Blackwell, 2018, 123 (2), pp.812-833. ⟨10.1002/2017JC013294⟩. ⟨hal-01661645⟩

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