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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 

References

Aramaki, T, Mizushima, T, Mizutani, Y, Yamamoto, T, Togawa, O, Kabuto, S, Kuji, T, Gottdang, A, Klein, M, Mous, DJW. 2000. The AMS facility at the Japan Atomic Energy Research Institute (JAERI). Nuclear Instruments and Methods in Physics Research B 172(1–4):18–23.CrossRefGoogle Scholar
Aramaki, T, Mizushima, T, Kuji, T, Povinec, PP, Togawa, O. 2001a. Distribution of radiocarbon in the southwestern North Pacific. Radiocarbon 43(2B):857–67.CrossRefGoogle Scholar
Aramaki, T, Watanabe, S, Kuji, T, Wakatsuchi, M. 2001b. The Okhotsk-Pacific seawater exchange in the viewpoint of vertical profiles of radiocarbon around the Bussol' Strait. Geophysical Research Letters 28(20):3971–4Google Scholar
Dickson, AG. 1995. Determination of dissolved oxygen in sea water by Winkler titration. WOCE Operations Manual. Part 3.1.3 Operations & Methods, WHP Office Report WHPO 91-1. p 1–14.Google Scholar
Gamo, T. 1999. Global warming may have slowed down the deep conveyor belt of a marginal sea of the northwestern Pacific: Japan Sea. Geophysical Research Letters 26(20):3137–40.CrossRefGoogle Scholar
Gamo, T, Horibe, Y. 1983. Abyssal circulation in the Japan Sea. Journal of the Oceanographical Society of Japan 39(5):220–30.Google Scholar
Gamo, T, Nozaki, Y, Sakai, H, Nakai, T, Tsubota, H. 1986. Spatial and temporal variations of water characteristics in the Japan Sea bottom layer. Journal of Marine Research 44(4):781–93.Google Scholar
Key, RM, Quay, PD, Schlosser, P, McNichol, AP, von Reden, KF, Schneider, RJ, Elder, KL, Stuiver, M, Östlund, HG. 2002. WOCE radiocarbon IV: Pacific Ocean results; P10, P13N, P14C, P18, P19 & S4P. Radiocarbon 44(1):239–392.Google Scholar
Knap, A, Michaels, A, Close, A, Ducklow, H, Dickson, A, editors. 1996. Protocols for the Joint Global Ocean Flux Study (JGOFS) core measurements. JGOFS Report nr. 19. p 174.Google Scholar
Kumamoto, Y, Yoneda, M, Shibata, Y, Kume, H, Tanaka, A, Uehiro, T, Morita, M, Shitashima, K. 1998. Direct observation of the rapid turnover of the Japan Sea bottom water by means of AMS radiocarbon measurement. Geophysical Research Letters 25(5):651–4.Google Scholar
Levin, I, Kromer, B, Schoch-Fischer, H, Bruns, M, Münnich, M, Berdau, D, Vogel, JC, Münnich, KO. 1994. Δ14CO2 records from sites in Central Europe. In: Boden, TA, Kaiser, DP, Sepanski, RJ, Stoss, FW, editors. Trends '93: A Compendium of Data on Global Change. ORNL/CDIAC-65, Carbon Dioxide Information Analysis Center, Oak Ridge National Laboratory, Oak Ridge, Tennesseee, USA. p 203–22.Google Scholar
Martin, S, Munoz, E, Drucker, R. 1992. The effect of severe storms on the ice cover of the northern Tatarskiy Strait. Journal of Geophysical Research 97(C11): 17,753–64.Google Scholar
Nitani, H. 1972. On the deep and bottom waters in the Japan Sea. In: Shoji, D, editor. Research in Hydrography and Oceanography. Tokyo: Hydrographic Department of Japan Maritime Safety Agency. p 151–201.Google Scholar
Povinec, PP, Aramaki, T, Burr, GS, Jull, AJT, Kwong, LLW, Togawa, O. 2004. Radiocarbon in the water column of the southwestern North Pacific Ocean—24 years after GEOSECS. Radiocarbon 46(2):583–94.Google Scholar
Riser, SC, Warner, MJ, Yurasov, GI. 1999. Circulation and mixing of water masses of Tatar Strait and the northwestern boundary region of the Japan Sea. Journal of Oceanography 55(2):133–56.Google Scholar
Senjyu, T, Sudo, H. 1993. Water characteristics and circulation of the upper portion of the Japan Sea Proper Water. Journal of Marine Systems 4:349–62.Google Scholar
Senjyu, T, Aramaki, T, Otosaka, S, Togawa, O, Danchenkov, M, Karasev, E, Volkov, Yu. 2002. Renewal of the bottom water after the winter 2000–2001 may spin-up the thermohaline circulation in the Japan Sea. Geophysical Research Letters 29(7): doi:10.1029/2001GL014093.Google Scholar
Stommel, H. 1958. The abyssal circulation. Deep-Sea Research 5(1):80–2.Google Scholar
Suda, K. 1932. On the bottom water in the Japan Sea (preliminary report). Journal of Oceanography 4:221–41. In Japanese.Google Scholar
Sudo, H. 1986. A note on the Japan Sea Proper Water. Progress in Oceanography 17(3–4):313–36.CrossRefGoogle Scholar
Takizawa, T. 1982. Characteristics of the Soya Warm Current in the Okhotsk Sea. Journal of the Oceanographical Society of Japan 38(5):281–92.Google Scholar
Watanabe, S, Nakajima, M, Tsunogai, S. 1989. Carbon dioxide exchange rate in the Japan Sea estimated from radiocarbon. Paper presented at the 1989 Spring Meeting of the Oceanographical Society of Japan. In Japanese.Google Scholar