Accurate parameterization of turbulent mixing processes in the abyssal ocean for embedding in next-generation global overturning circulation models
| Project/Area Number |
24340109
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| Research Category |
Grant-in-Aid for Scientific Research (B)
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| Allocation Type | Partial Multi-year Fund |
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| Section | 一般 |
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| Research Field |
Meteorology/Physical oceanography/Hydrology
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| Research Institution | The University of Tokyo |
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Principal Investigator |
Hibiya Toshiyukii 東京大学, 理学(系)研究科(研究院), 教授 (80192714)
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| Project Period (FY) |
2012-04-01 – 2016-03-31
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| Project Status |
Completed (Fiscal Year 2015)
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| Budget Amount *help |
¥18,720,000 (Direct Cost: ¥14,400,000、Indirect Cost: ¥4,320,000)
Fiscal Year 2014: ¥1,950,000 (Direct Cost: ¥1,500,000、Indirect Cost: ¥450,000)
Fiscal Year 2013: ¥5,330,000 (Direct Cost: ¥4,100,000、Indirect Cost: ¥1,230,000)
Fiscal Year 2012: ¥11,440,000 (Direct Cost: ¥8,800,000、Indirect Cost: ¥2,640,000)
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| Keywords | 乱流混合 / パラメタリゼーション / 深層海洋大循環 / 内部波 / 非線形相互干渉 / 潮汐流 / 海底地形 / 超深海 / エネルギー散逸 |
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| Outline of Final Research Achievements |
An accurate representation of ocean mixing processes over rough bathymetry is essential in global circulation models. We perform a series of eikonal calculations for a wide range of parameters, namely, the amplitude (Uo) of tidal flow with semidiurnal frequency (Ω) and the horizontal wavenumber (k) of the bottom topography to see how upward propagating internal waves generated by tide-topography interactions donate their energy to dissipation through nonlinear interactions with the background internal waves. It has been shown that the resulting mixing hotspot becomes concentrated nearer the ocean bottom as k increases for kUo/Ω<1 independent of Uo, whereas it extends vertically upward as Uo increases for kUo/Ω>1 independent of k. An interpretation for these calculated results has been made in terms of the vertical group velocity and the life time for each of linear internal tides and quasi-steady lee waves emanating from the ocean bottom for kUo/Ω<1 and kUo/Ω>1, respectively.
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Report
(5 results)
Research Products
(51 results)
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[Journal Article] 海洋学の10年展望(I) 日本海洋学会将来構想委員会物理サブグループの議論から2013
Author(s)
岡英太郎, 磯辺篤彦, 市川香, 升本順夫, 須賀利雄, 川合義美, 大島慶一郎, 島田浩二, 羽角博康, 見延庄士朗, 早稲田卓爾, 岩坂直人, 河宮美知生, 伊藤幸彦, 久保田雅久, 中野俊也, 日比谷紀之
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Journal Title
海の研究
Volume: 22(6)
Pages: 191-218
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Peer Reviewed
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[Presentation] 沖縄トラフ南部中深層水塊の形成過程2014
Author(s)
仁科文子, 中村啓彦, 朴在勲, 長谷川大介, 日比谷紀之, 田中祐希
Organizer
2014年度日本海洋学会春季大会
Place of Presentation
東京海洋大学（ 東京 ）
Year and Date
2014-03-28
Related Report
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