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Circulation in the Northern Japan Sea Studied Chiefly with Radiocarbon

Published online by Cambridge University Press:  18 July 2016

T Aramaki ,
T Senjyu ,
O Togawa ,
S Otosaka ,
T Suzuki ,
T Kitamura ,
H Amano  and
Y N Volkov
T Aramaki*
Affiliation:
National Institute for Environmental Studies, 16-2 Onogawa, Tsukuba, Ibaraki 305–8506, Japan
T Senjyu
Affiliation:
Research Institute for Applied Mechanics, Kyushu University, 6-1 Kasuga-koen, Kasuga, Fukuoka 816–8580, Japan
O Togawa
Affiliation:
Japan Atomic Energy Agency, 2–4 Shirakata-Shirane, Tokai, Ibaraki 319–1195, Japan
S Otosaka
Affiliation:
Japan Atomic Energy Agency, 2–4 Shirakata-Shirane, Tokai, Ibaraki 319–1195, Japan
T Suzuki
Affiliation:
Japan Atomic Energy Agency, 2–4 Shirakata-Shirane, Tokai, Ibaraki 319–1195, Japan
T Kitamura
Affiliation:
Japan Atomic Energy Agency, 2–4 Shirakata-Shirane, Tokai, Ibaraki 319–1195, Japan
H Amano
Affiliation:
Japan Atomic Energy Agency, 2–4 Shirakata-Shirane, Tokai, Ibaraki 319–1195, Japan
Y N Volkov
Affiliation:
Far Eastern Regional Hydrometeorological Research Institute, 24 Fontanaya St., Vladivostok 690990, Russia
*
Corresponding author. Email: ara@nies.go.jp
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Abstract

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Radiocarbon concentrations in the northernmost region of the Japan Sea were observed during the summer of 2002. The averaged surface δ14C (above 100 m depth) was 52 ± 8%, which is significantly higher compared with the values of the Pacific Ocean and Okhotsk Sea. The δ14C in the deep water decreased with density, and the minimum value was −70%. By analyzing 14C and other hydrographic data, we found that i) the Tsushima Warm Current Water reaches to the surface layer in the southern Tatarskiy Strait; ii) deep convection did not occur in the northernmost region, at least not after the winter of 2001–2002; and iii) the bottom water that was previously formed in this region may step down southward along the bottom slope and mix with the Japan Sea Bottom Water. Furthermore, a new water mass characterized by high salinity (>34.09 psu) was found in the subsurface layer in the area north of 46°N.

Type
Articles
Information
Radiocarbon , Volume 49 , Issue 2 , 2007 , pp. 915 - 924
Copyright
Copyright © 2007 by the Arizona Board of Regents on behalf of the University of Arizona 

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