Analysis of biogeochemical changes in the North Pacific using long-term time-series data of dissolved oxygen

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Data of dissolved oxygen in the western North Pacific were compiled and quality-checked by a statistical technique. The errors due to interpolation of discrete oxygen data were also evaluated by comparing with vertical continuous data obtained by a new rapid-response oxygen sensor that was introduced and examined in this study. In the northern subtropical and subarctic zones, significant trend of oxygen decreases were determined at depths between 500m and 2000m. These decreasing trend are mainly attributable to the decrease in density that is associated with ocean warming, but those at the depth around 1000m is ascribed to the changes in the ocean circulation.