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

  • Tatsuya Tsuboi, Hiroshi Iwata, Hideki Wada, Hiroyuki Matsuzaki, Rumi Sohrin, Yutaka Hiroe, Tadafumi Ichikawa, Kiyotaka Hidaka, Tomoo Watanabe
  • Journal:
    Radiocarbon / Volume 53 / Issue 4 / 2011
    Published online by Cambridge University Press:
    18 July 2016, pp. 679-690
    Print publication:
    2011
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  • We present the water column profiles (surface to 2000 m depth) for dissolved inorganic radiocarbon (14CDIC) from 2 stations in the Kuroshio region including the Kuroshio large meander (LM) of 2004–2005. Surprisingly, the Δ14CDIC value varied up to 125‰ in the intermediate layer, especially near 600 m depth. In addition, the Δ14CDIC value was approximately − 150‰ at 200 m depth at the northern station of Kuroshio in August 2005. This value is ∼100‰ less than other Δ14CDIC values for the same depth. In comparison, the Δ14CDIC 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 Δ14CDIC water column profiles in the study region.