Circulation in the northern Japan sea studied chiefly with radiocarbon

T. Aramaki, T. Senjyu, O. Togawa, S. Otosaka, T. Suzuki, T. Kitamura, H. Amano, Y. N. Volkov

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10 Citations (Scopus)


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.

Original languageEnglish
Pages (from-to)915-924
Number of pages10
Issue number2
Publication statusPublished - Nov 2007

All Science Journal Classification (ASJC) codes

  • Archaeology
  • Earth and Planetary Sciences(all)


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