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

Published online by Cambridge University Press:  18 July 2016

Tatsuya Tsuboi ,
Hiroshi Iwata ,
Hideki Wada ,
Hiroyuki Matsuzaki ,
Rumi Sohrin ,
Yutaka Hiroe ,
Tadafumi Ichikawa ,
Kiyotaka Hidaka  and
Tomoo Watanabe
Tatsuya Tsuboi
Affiliation:
Graduate School of Science, Shizuoka University, 836 Oya, Suruga-Ku, Shizuoka 422-8529, Japan.
Hiroshi Iwata
Affiliation:
Institute of Geosciences, Shizuoka University, 836 Oya, Suruga-Ku, Shizuoka 422-8529, Japan.
Hideki Wada*
Affiliation:
Institute of Geosciences, Shizuoka University, 836 Oya, Suruga-Ku, Shizuoka 422-8529, Japan.
Hiroyuki Matsuzaki
Affiliation:
Research Center for Nuclear Science and Tech., University of Tokyo, 2-11-16 Yayoi, Bunkyo-Ku, Tokyo 113-0032, Japan.
Rumi Sohrin
Affiliation:
Institute of Geosciences, Shizuoka University, 836 Oya, Suruga-Ku, Shizuoka 422-8529, Japan.
Yutaka Hiroe
Affiliation:
National Research Institute of Fisheries Science, Fisheries Research Agency, 2-12-4 Fukuura, Kanazawa-Ku, Yokohama 236-8648, Japan.
Tadafumi Ichikawa
Affiliation:
National Research Institute of Fisheries Science, Fisheries Research Agency, 2-12-4 Fukuura, Kanazawa-Ku, Yokohama 236-8648, Japan.
Kiyotaka Hidaka
Affiliation:
National Research Institute of Fisheries Science, Fisheries Research Agency, 2-12-4 Fukuura, Kanazawa-Ku, Yokohama 236-8648, Japan.
Tomoo Watanabe
Affiliation:
National Research Institute of Fisheries Science, Fisheries Research Agency, 2-12-4 Fukuura, Kanazawa-Ku, Yokohama 236-8648, Japan.
*
Corresponding author. Email: [email protected].
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Abstract

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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.

Type
Articles
Information
Radiocarbon , Volume 53 , Issue 4 , 2011 , pp. 679 - 690
Copyright
Copyright © The Arizona Board of Regents on behalf of the University of Arizona 

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