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. Oceanic dissolved organic carbon (DOC) represents one ofthe largest carbon reservoirs on Earth, and its distribution andbiogeochemical cycles play important roles in carbon cycling and otherbiogeochemical processes in the ocean. We report the distribution andconcentrations of DOC for water samples collected from the shelf-edge andslope regions in the East China Sea (ECS) and the Kuroshio Extension (KE) inthe northwestern North Pacific during two cruises in 2014–2015. The DOCconcentrations were 45–88  µ M in the ECS and 35–65  µ M in theKE. In addition to biological processes that are estimated to account for7 % and 8 %–20 % in shaping the DOC distribution in the ECS and KEregions, respectively, the DOC distribution is largely controlled byhydrodynamic mixing of different water masses. By comparing the DOC resultswith dissolved inorganic carbon (DIC) and dissolved inorganic radiocarbon( Δ14C -DIC) measured from the same water samples, we furtherdemonstrate that the intrusion of the Kuroshio Current could dilute the DOCconcentrations at stations in the outer shelf and slope regions of the ECS.The concentrations of DOC in the KE were significantly lower in surfacewaters than in the ECS, and a relatively low and stable DOC level( ∼40 µ M) was found in deep water (below 1500 m) at allstations. Based on the previously reported DIC and Δ14C -DICvalues for the stations, the observed spatial variations of DOC in the upper700 m among the stations in the KE were mainly influenced by mixing of thetwo water masses carried by the Kuroshio and Oyashio, the two dominantwestern boundary currents in the region. The hydrodynamic processes are thusimportant factors in the distribution and dynamics of DOC in the KE region.

Dissolved organic carbon dynamics in the East China Sea and the northwest Pacific Ocean