Hostname: page-component-8448b6f56d-c4f8m Total loading time: 0 Render date: 2024-04-24T12:18:19.478Z Has data issue: false hasContentIssue false
  • English
  • Français

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: schwada@ipc.shizuoka.ac.jp.
Rights & Permissions [Opens in a new window]

Abstract

Core share and HTML view are not available for this content. However, as you have access to this content, a full PDF is available via the ‘Save PDF’ action button.

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 

References

Aramaki, T, Mizushima, T, Kuji, T, Povince, PP, Togawa, O. 2001. Distribution of radiocarbon in the southwestern North Pacific. Radiocarbon 43(2B):857–67.Google Scholar
Bard, E, Arnold, M, Toggweiler, R, Maurice, P, Duplessy, J-C. 1989. Bomb 14C in the Indian Ocean measured by accelerator mass spectrometry: oceanographic implications. Radiocarbon 31(3):510–22.Google Scholar
Bhushan, R, Somayajulu, BLK, Chakraborty, S, Krishnaswami, S. 2000. Radiocarbon in the Arabian Sea water column: temporal variations in bomb 14C since the GEOSECS and CO2 air-sea exchange rates. Journal of Geophysical Research 105(C6):14,273–82.CrossRefGoogle Scholar
Bhushan, R, Dutta, K, Mulsow, S, Povince, PP, Somayajulu, BLK. 2003. Distribution of natural and man-made radionuclides during reoccupation of GEOSECS stations 413 and 416 in the Arabian Sea: temporal changes. Deep-Sea Research II 50(17–21):2777–84.Google Scholar
Bhushan, R, Dutta, K, Somayajulu, BLK. 2008. Estimates of upwelling rates in the Arabian Sea and the equatorial Indian Ocean based on bomb radiocarbon. Journal of Environmental Radioactivity 99(10):1566–71.CrossRefGoogle ScholarPubMed
Broecker, WS. 1987. The biggest chill. Natural History Magazine 96:74–82.Google Scholar
Broecker, WS, Peng, TH, Stuiver, M. 1978. An estimate of the upwelling rate in the equatorial Atlantic based on the distribution of bomb radiocarbon. Journal of Geophysical Research 83(C12):6179–86.CrossRefGoogle Scholar
CCHDO. 2011. CLIVAR and Carbon Hydrographic Data Office. URL: http://cchdo.ucsd.edu/. Accessed 17 June 2011.Google Scholar
Druffel, ERM, Bauer, JE, Griffin, S, Beaupré, SR, Hwang, J. 2008. Dissolved inorganic radiocarbon in the North Pacific Ocean and Sargasso Sea. Deep-Sea Research I 55(4):451–9.Google Scholar
Fofonoff, NP, Millard, RC Jr. 1983. Algorithms for Computation of Fundamental Properties of Seawater. Paris: UNESCO Technical Papers in Marine Science 44. 53 p.Google Scholar
Horibe, Y, Gamo, T. 1980. Chemical characteristics of the Cold Water Mass of Kuroshio. In: The Kuroshio IV: Proceedings of the 4th CSK Symposium. Tokyo: Saikon Publishing Co. Ltd. p 360–70.Google Scholar
Kawabe, M. 1985. Sea level variations at the Izu Islands and typical stable paths of the Kuroshio. Journal of Oceanography 41(5):307–26.Google Scholar
Kawabe, M. 1995. Variations of current path, velocity, and volume transport of the Kuroshio in relation with the large meander. Journal of Physical Oceanography 25(12):3103–17.Google Scholar
Kawabe, M. 2005. Variations of the Kuroshio in the southern region of Japan: conditions for large meander of the Kuroshio. Journal of Oceanography 61(3):529–37.Google Scholar
Kitagawa, H, Masuzawa, T, Nakamura, T, Matsumoto, E. 1993. A batch preparation method for graphite targets with low background for AMS 14C measurements. Radiocarbon 35(2):295–300.Google Scholar
Kumamoto, Y, Murata, A, Saito, C, Honda, M, Kusakabe, M. 2002. Bomb radiocarbon invasion into the northwestern North Pacific. Deep-Sea Research II 49(24–25):5339–51.Google Scholar
Matsuzaki, H, Nakano, C, Yamashita, H, Maejima, Y, Miyairi, Y, Wakasa, S, Horiuchi, K. 2004. Current status and future direction of MALT, the University of Tokyo. Nuclear Instruments and Methods in Physics Research B 223–224:92–9.Google Scholar
Matsuzaki, H, Nakano, C, Tsuchiya, Y, Kato, K, Maejima, Y, Miyairi, Y, Wakasa, S, Aze, T. 2007. Multi-nuclide AMS performances at MALT. Nuclear Instruments and Methods in Physics Research B 259(1):36–40.CrossRefGoogle Scholar
Östlund, HG, Stuiver, M. 1980. GEOSECS Pacific radiocarbon. Radiocarbon 22(1):25–53.CrossRefGoogle Scholar
Povinec, PP, Aramaki, T, Jull, AJT, Kwong, LLW. 2004. Radiocarbon in the water column of the southwestern North Pacific Ocean—24 years after GEOSECS. Radiocarbon 46(2):583–94.CrossRefGoogle Scholar
Reid, JL. 1965. Intermediate Waters of the Pacific Ocean. Baltimore: Johns Hopkins Oceanographic Studies 2. 85 p.Google Scholar
Somayajulu, BLK, Bhushan, R, Narvekar, PV. 1999. Δ14C, ΣCO2 and salinity of the western Indian Ocean deep waters: spatial and temporal variations. Geophysical Research Letters 26(18):2869–72.CrossRefGoogle Scholar
Stommel, H, Yoshida, K. 1972. The Kuroshio – Its Physical Aspects. Tokyo: University of Tokyo Press. p 235–354.Google Scholar
Stuiver, M, Polach, HA. 1977. Discussion: reporting of 14C data. Radiocarbon 19(3):355–63.Google Scholar
Stuiver, M, Quay, PD, Östlund, HG. 1983. Abyssal water carbon-14 distribution and the age of the world oceans. Science 219(4586):849–51.Google Scholar
Stuiver, M, Östlund, HG, Key, RM, Reimer, PJ. 1996. Large volume WOCE radiocarbon sampling in the Pacific Ocean. Radiocarbon 38(3):519–61.Google Scholar
Sugisaki, H, Nonaka, M, Ishizaki, S, Hidaka, K, Kameda, T, Hirota, Y, Oozeki, Y, Kubota, H, Takasuka, A. 2010. Status and trends of the Kuroshio region, 2003–2008. In: McKinnell, SM, Dagg, MJ, editors. Marine Ecosystems of the North Pacific Ocean, 2003–2008. PICES Special Publication 4. North Pacific Marine Science Organization, Sidney, British Columbia. p 330–59.Google Scholar
Talley, LD. 1993. Distribution and formation of North Pacific Intermediate Water. Journal of Physical Oceanography 23(3):517–37.Google Scholar
Tsuchiya, R, Wada, H. 2002. Vacuum CO2 extraction method from seawater for AMS 14C analysis. Geoscience Reports Shizuoka University 29:113–8. In Japanese.Google Scholar
UNESCO. 1981. Background Papers and Supporting Data on the International Equation of State of Seawater. Paris: UNESCO Technical Papers in Marine Science 38. 192 p.Google Scholar
Yoshida, T, Shimohira, Y, Rinno, H, Yokouchi, K, Akiyama, H. 2006. Criteria for the determination of a large meander of the Kuroshio based on its path information. The Oceanography in Japan 15(6):499–507. In Japanese.Google Scholar
You, Y. 2003. The pathway and circulation of North Pacific Intermediate Water. Geophysical Research Letters 30(24):2291, doi:10.1029/2003GL018561.Google Scholar