Volume transport from the Japan Basin to the Yamato Basin in the abyssal Japan Sea inferred from direct current observations

Tomoharu Senjyu, Takafumi Aramaki

Research output: Contribution to journalArticle

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Abstract

The transport of Japan Basin Bottom Water (JBBW) into the Yamato Basin in the Japan Sea is an important boundary condition for the modification of the abyssal water mass in the Yamato Basin. To estimate the volume transport of JBBW, two year-long observations (October 2011–October 2012 and May 2014–May 2015) were carried out using current meters moored in the deep channel connecting the Japan Basin with the Yamato Basin. The mean transport toward the Yamato Basin from the Japan Basin was estimated to be 7.37 × 104 and 5.15 × 104 m3 s−1, consistent with previous estimates from box model analysis and lowered acoustic Doppler current profiler observations. The time series of JBBW transport showed significant variability. A cause of the variability was bottom-intensified flow fluctuations in the 3- to 15-day period band, which suggests bottom-trapped topographic Rossby waves in the deep channel. In addition, during August–October 2014, notable variation of JBBW transport accompanied significant decreases of potential temperature and dissolved oxygen concentration. Detailed examination of the episodic variations of flows, potential temperature, and dissolved oxygen concentration, together with consideration of sea surface height variations, suggested that rapid northward meandering of the surface subarctic front was another cause of the significant variation in JBBW transport.

Original languageEnglish
Pages (from-to)235-247
Number of pages13
JournalJournal of Oceanography
Volume73
Issue number2
DOIs
Publication statusPublished - Apr 1 2017

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volume transport
basin
bottom water
potential temperature
dissolved oxygen
sea
sea surface height
Acoustic Doppler Current Profiler
Rossby wave
water mass
boundary condition
time series

All Science Journal Classification (ASJC) codes

  • Oceanography

Cite this

Volume transport from the Japan Basin to the Yamato Basin in the abyssal Japan Sea inferred from direct current observations. / Senjyu, Tomoharu; Aramaki, Takafumi.

In: Journal of Oceanography, Vol. 73, No. 2, 01.04.2017, p. 235-247.

Research output: Contribution to journalArticle

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