Flow Intensification Due to the Superposition of Near-Inertial Internal Waves in the Abyssal Yamato and Tsushima Basins of the Japan Sea (East Sea)

Tomoharu Senjyu, Hong Ryeol Shin

研究成果: Contribution to journalArticle査読

抄録

Near-inertial internal waves (NIWs) in the abyssal Yamato and Tsushima Basins of the Japan Sea (East Sea) were investigated using data from a moored acoustic Doppler current profiler (ADCP) and single-point current meters. The NIW events with duration of 3–5 days were observed intermittently in both basins. In particular, an active NIW event occurred below 2,475 m in the Yamato Basin during May 12–16, 2014. This was followed by the upward propagation of a wave packet from 2,475 to 950 m. The near-inertial flows (1.07f) during the event exhibited a vertically coherent phase and intensification with depth by a factor of 1.5 from 2,475 to 2,635 m. The near-inertial flows (1.05f) in the Tsushima Basin also showed a vertically coherent phase and intensification with depth, although the amplitude of the flow exhibited a middepth maximum rather than monotonic intensification. As a possible explanation of the observed flow characteristics, the superposition of downward-propagating NIWs that can be excited by a strong wind event and upward-propagating NIWs that bounced off the seabed was examined. The time series of the Richardson number based on the observed shear showed sporadic unstable conditions during the initial stage of the NIW event during May 2014 in the Yamato Basin. In addition, relatively small values of Richardson number were observed over the range of 2,475–2,635 m during the period of active NIWs. This suggests the promotion of vertical mixing in the deep sea during significant NIW events.

本文言語英語
論文番号e2020JC016647
ジャーナルJournal of Geophysical Research: Oceans
126
3
DOI
出版ステータス出版済み - 3 2021
外部発表はい

All Science Journal Classification (ASJC) codes

  • 地球化学および岩石学
  • 地球物理学
  • 地球惑星科学(その他)
  • 宇宙惑星科学
  • 海洋学

フィンガープリント

「Flow Intensification Due to the Superposition of Near-Inertial Internal Waves in the Abyssal Yamato and Tsushima Basins of the Japan Sea (East Sea)」の研究トピックを掘り下げます。これらがまとまってユニークなフィンガープリントを構成します。

引用スタイル