The Kuroshio flowing over seamounts and associated submesoscale flows drive 100-km-wide 100-1000-fold enhancement of turbulence

Takeyoshi Nagai, Daisuke Hasegawa, Eisuke Tsutsumi, Hirohiko Nakamura, Ayako Nishina, Tomoharu Senjyu, Takahiro Endoh, Takeshi Matsuno, Ryuichiro Inoue, Amit Tandon

研究成果: ジャーナルへの寄稿学術誌査読

4 被引用数 (Scopus)

抄録

Although previous studies reported that currents over topographic features, such as seamounts and ridges, cause strong turbulence in close proximity, it has been elusive how far intense turbulence spreads toward the downstream. Here, we conducted a series of intensive in-situ turbulence observations using a state-of-the-art tow-yo microstructure profiler in the Kuroshio flowing over the seamounts of the Tokara Strait, south of Kyusyu Japan, in November 2017, June 2018, and November 2019, and employed a high-resolution numerical model to elucidate the turbulence generation mechanisms. We find that the Kuroshio flowing over seamounts generates streaks of negative potential vorticity and near-inertial waves. With these long-persisting mechanisms in addition to other near-field mixing processes, intense mixing hotspots are formed over a 100-km scale with the elevated energy dissipation by 100- to 1000-fold. The observed turbulence could supply nutrients to sunlit layers, promoting phytoplankton primary production and CO2 uptake.

本文言語英語
論文番号170
ジャーナルCommunications Earth and Environment
2
1
DOI
出版ステータス出版済み - 12月 2021

!!!All Science Journal Classification (ASJC) codes

  • 環境科学(全般)
  • 地球惑星科学(全般)

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