Seafloor Pressure Change Excited at the Northwest Corner of the Shikoku Basin by the Formation of the Kuroshio Large-Meander in September 2017

The Kuroshio takes a greatly southward displaced path called large-meander (LM) off the southern coast of Japan on interannual to decadal time scales. transition current from non-large-meander an LM is most salient ocean variation south Japan. change in pressure seafloor due formation September 2017 critical importance understand dynamics and distinguish changes crustal deformation. Hence, we examined across continental slope eastern Kyushu for period March 2014 April 2019. its cross-slope gradient over shallower than 3,000 m beneath near are invariable. As mesoscale disturbance, small meander, passed observation stations, decreased by approximately 0.1 dbar deeper 3000 was kept low until end (April 2019). decrease consistent with sea surface height subsurface water density caused baroclinic enhancement Shikoku Basin local recirculation. This implies strengthening deep southwestward current, possibly as part cyclonic circulation Basin. present study demonstrated that, addition altimetric data, hydrographic data useful deformation, vice versa.