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Spatial Distribution of Radiocarbon in the Southwestern Japan/East Sea Immediately After Bottom Water Renewal

Published online by Cambridge University Press:  09 February 2016

Takafumi Aramaki*
Affiliation:
Center for Environmental Measurement and Analysis, National Institute for Environmental Studies, 16-2, Onogawa, Tsukuba, Ibaraki 305-8506, Japan
Shinichi S Tanaka
Affiliation:
Center for Environmental Measurement and Analysis, National Institute for Environmental Studies, 16-2, Onogawa, Tsukuba, Ibaraki 305-8506, Japan
Seiko Kushibashi
Affiliation:
Center for Environmental Measurement and Analysis, National Institute for Environmental Studies, 16-2, Onogawa, Tsukuba, Ibaraki 305-8506, Japan
Young-Il Kim
Affiliation:
Korea Institute of Ocean Science & Technology, 1270 Sasong, Ansan 426-744, Korea
Chang-Jun Kim
Affiliation:
Korea Institute of Ocean Science & Technology, 1270 Sasong, Ansan 426-744, Korea
Gi-Hoon Hong
Affiliation:
Korea Institute of Ocean Science & Technology, 1270 Sasong, Ansan 426-744, Korea
Tomoharu Senjyu
Affiliation:
Research Institute for Applied Mechanics, Kyushu University, 6-1 Kasuga-koen, Kasuga, Fukuoka 816-8580, Japan
*
2Corresponding author. Email: ara@nies.go.jp.

Abstract

In April 2001, immediately after bottom water renewal in the Japan/East Sea, 7 vertical profiles of radiocarbon were obtained from the area, including the Japan Basin and the Tsushima/Ulleung Basin. The bottom water Δ14C of the Tsushima/Ulleung Basin increased by 24% during 1979–2001 and was 10–15% higher than the values reported for the Japan Basin and Yamato Basin during 1995–2002. Within the depth interval 800–2000 m, Δ14C values at the southernmost station in the Japan Basin were much higher than at other stations, with the maximum difference in Δ14C values being more than 50%. Based on a combination of physical observations with analysis of the Δ14C data, we concluded that the bottom water, which was formed by the sinking of surface water off Vladivostok, Russia, in late January-early February of 2001, had been widely distributed to depths below 2000 m within the southernmost Japan Basin in a timespan shorter than 2 months. However, there was no evidence that the water had been transported into the Tsushima/Ulleung Basin during the same time interval.

Type
Oceanic Carbon Cycle
Copyright
Copyright © 2013 by the Arizona Board of Regents on behalf of the University of Arizona 

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