Abyssal water mass exchange between the Japan and Yamato Basins in the Japan Sea

Tomoharu Senjyu, Takafumi Aramaki, Shinichi S. Tanaka, Jin Zhang, Yutaka Isoda, Yuichiro Kumamoto, Sho Hibino, Toshiya Nakano

Research output: Contribution to journalArticle

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Abstract

Bottom water exchange between the Japan and Yamato Basins in the abyssal Japan Sea is investigated based on data from two research cruises in June 2010 and June 2011. Distributions of water properties and velocity profiles from CTD/LADCP observations revealed a two-layer water mass exchange in a rotating system. The cold Japan Basin Bottom Water (JBBW) with high dissolved oxygen (DO) concentrations flowed into the Yamato Basin along the northern boundary of the channel connecting the basins, while the warmer, lower-DO Yamato Basin Bottom Water (YBBW) extended over the JBBW along the southern periphery of the channel. A benthic front between the JBBW and YBBW was observed in both cruises, though the front shifted to the northeast in 2011 compared with its 2010 location. Further, the bottom flows in the channel were not unidirectional in 2011, though consistent southwestward flows were observed in 2010. The JBBW transport into the Yamato Basin was also larger in 2010 than in 2011. Analysis of historical hydrographic data showed that the benthic front exists mostly in the narrowest region of the channel, though it fluctuates temporarily to the northeast or southwest. The fluctuation of the benthic front appears to be associated with the JBBW transport because the observations in June 2010 and June 2011 were carried out during periods of southwestward extension of cold water and northeast protrusion of warm water, respectively. A relationship between benthic front displacements and mesoscale warm eddy migrations is suggested.

Original languageEnglish
Pages (from-to)4878-4888
Number of pages11
JournalJournal of Geophysical Research: Oceans
Volume118
Issue number10
DOIs
Publication statusPublished - Jan 1 2013

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water mass
Japan
basins
bottom water
Water
basin
water
Dissolved oxygen
dissolved oxygen
sea
charge transfer devices
cold water
water distribution
oxygen
water exchange
velocity profile
warm water
eddy
velocity distribution
vortices

All Science Journal Classification (ASJC) codes

  • Geophysics
  • Oceanography
  • Forestry
  • Aquatic Science
  • Ecology
  • Condensed Matter Physics
  • Water Science and Technology
  • Soil Science
  • Geochemistry and Petrology
  • Earth-Surface Processes
  • Physical and Theoretical Chemistry
  • Polymers and Plastics
  • Atmospheric Science
  • Earth and Planetary Sciences (miscellaneous)
  • Space and Planetary Science
  • Materials Chemistry
  • Palaeontology

Cite this

Senjyu, T., Aramaki, T., Tanaka, S. S., Zhang, J., Isoda, Y., Kumamoto, Y., ... Nakano, T. (2013). Abyssal water mass exchange between the Japan and Yamato Basins in the Japan Sea. Journal of Geophysical Research: Oceans, 118(10), 4878-4888. https://doi.org/10.1002/jgrc.20373

Abyssal water mass exchange between the Japan and Yamato Basins in the Japan Sea. / Senjyu, Tomoharu; Aramaki, Takafumi; Tanaka, Shinichi S.; Zhang, Jin; Isoda, Yutaka; Kumamoto, Yuichiro; Hibino, Sho; Nakano, Toshiya.

In: Journal of Geophysical Research: Oceans, Vol. 118, No. 10, 01.01.2013, p. 4878-4888.

Research output: Contribution to journalArticle

Senjyu, T, Aramaki, T, Tanaka, SS, Zhang, J, Isoda, Y, Kumamoto, Y, Hibino, S & Nakano, T 2013, 'Abyssal water mass exchange between the Japan and Yamato Basins in the Japan Sea', Journal of Geophysical Research: Oceans, vol. 118, no. 10, pp. 4878-4888. https://doi.org/10.1002/jgrc.20373
Senjyu, Tomoharu ; Aramaki, Takafumi ; Tanaka, Shinichi S. ; Zhang, Jin ; Isoda, Yutaka ; Kumamoto, Yuichiro ; Hibino, Sho ; Nakano, Toshiya. / Abyssal water mass exchange between the Japan and Yamato Basins in the Japan Sea. In: Journal of Geophysical Research: Oceans. 2013 ; Vol. 118, No. 10. pp. 4878-4888.
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