Relation between subduction processes and surface-layer nutrient variations in the North Pacific subtropical gyre

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Based on the analyses of ocean climatology, repeat hydrography and the data from profiling floats equipped with oxygen sensors, variations of nutrient and dissolved oxygen along the advection path from the formation region of major water masses in the North Pacific are described. In particular, a vertical profile of time rate of dissolved-oxygen-concentration change in the area dominated by the subtropical mode water is revealed. Significant change in the subduction rate associated with the Pacific Decadal Oscillation is detected, with suggesting its influence on subsurface nutrient distribution.