Mechanism of subduction processes in the North Pacific subtropical region and their interannual variations

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We have investigated the subduction processes(in which water is subducted from the sea surface to the subsurface) and their temporal variations in the North Pacific subtropical region, focusing on mode waters, which are water masses characterized by their vertical homogeneity. By analyzing Argo float data and high-resolution numerical model outputs and conducting shipboard observations, we have clarified the structure of each mode water in its winter formation region, as well as the subduction process of each mode water in association with mesoscale variability with a horizontal scale of about 100km and its decadal variation.