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Circulation in the Northern Japan Sea Studied Chiefly with Radiocarbon

  • T Aramaki (a1), T Senjyu (a2), O Togawa (a3), S Otosaka (a3), T Suzuki (a3), T Kitamura (a3), H Amano (a3) and Y N Volkov (a4)...

Abstract

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.

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Copyright

Corresponding author

Corresponding author. Email: ara@nies.go.jp

References

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Radiocarbon
  • ISSN: 0033-8222
  • EISSN: 1945-5755
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