Water Column Profiles of Dissolved Inorganic Radiocarbon for the Kuroshio Region, Offshore of the Southern Japanese Coast

We present the water column profiles (surface to 2000 m depth) for dissolved inorganic radiocarbon ( 14 C DIC ) from 2 stations in the Kuroshio region including the Kuroshio large meander (LM) of 2004–2005. Surprisingly, the Δ 14 C DIC value varied up to 125‰ in the intermediate layer, especially near 600 m depth. In addition, the Δ 14 C DIC value was approximately − 150‰ at 200 m depth at the northern station of Kuroshio in August 2005. This value is ∼100‰ less than other Δ 14 C DIC values for the same depth. In comparison, the Δ 14 C DIC water column profiles for the southern station of Kuroshio and GEOSECS station 224 decrease down to 600 m depth and were similar below 600 m depth. Our results suggest that strong upwelling associated with the Kuroshio LM has a powerful influence on the Δ 14 C DIC water column profiles in the study region

Dissolved organic carbon · Radiocarbon dating · Submarine pipeline · Surface water · Upwelling · Water column · Environmental Science · Geology and Paleoclimatology Research · Isotope Analysis in Ecology · Methane Hydrates and Related Phenomena · Geology · Oceanography

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