Dynamic systems approach on variations of intensive currents in ocean double gyre

From the viewpoint of nonlinear dynamics, it is investigated how the eastward strong currents induce the self-organized long-time variations that are associated with the stable and unstable modes. To identify these long-time variations, we used dynamic system models, a quasi-geostrohic model, and ocean data assimilation data. As a result, it was found that entrainment and intermittency appear in the eastward strong currents depending on strengths of seasonal varying wind stress. Moreover, decadal/interdecadal variations are generated in the double gyre based on self-organized dynamic modes.