At the 650 m depth, the location of 7 °C isotherm agrees well with the location of maximum current. It suggests the cross-stream structure of the Kuroshio is fairly stable and most variations are induced by the north-south migration of the Kuroshio.
Even if the Kuroshio often changes its location horizontally, it keeps the geostrophic balance well.
The time series of current meter data processed by 5 days time-running mean with a Godin filter provide the best result.
High correlation of transport per unit depth between the sea surface and 650 m depth is found, indicating that the Kuroshio transport fluctuates synchronously in vertical at least in upper 650 m.
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