Spontaneous generation and dissipation of near-inertial internal waves from the Kuroshio Front
| Project/Area Number |
24684036
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| Research Category |
Grant-in-Aid for Young Scientists (A)
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| Allocation Type | Partial Multi-year Fund |
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| Research Field |
Meteorology/Physical oceanography/Hydrology
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| Research Institution | Tokyo University of Marine Science and Technology |
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Principal Investigator |
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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 |
¥22,750,000 (Direct Cost: ¥17,500,000、Indirect Cost: ¥5,250,000)
Fiscal Year 2015: ¥650,000 (Direct Cost: ¥500,000、Indirect Cost: ¥150,000)
Fiscal Year 2014: ¥2,210,000 (Direct Cost: ¥1,700,000、Indirect Cost: ¥510,000)
Fiscal Year 2013: ¥2,340,000 (Direct Cost: ¥1,800,000、Indirect Cost: ¥540,000)
Fiscal Year 2012: ¥17,550,000 (Direct Cost: ¥13,500,000、Indirect Cost: ¥4,050,000)
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| Keywords | 黒潮 / 近慣性内部波 / 乱流 / 微細構造 / フロント / 二重拡散対流 / 黒潮続流 / 自律型プロファイリングフロート / 蛇行 / 近慣性内部 / 熱塩フィラメント構造 / 渦 / 乱流混合 / 拡散 / 黒潮フロント / 乱流運動エネルギー散逸率 / 水温の微細構造 / サブダクション / 湧昇 / ソルトフィンガー / 海洋フロント / エネルギー散逸 / 中規模渦 / サブメソスケール |
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| Outline of Final Research Achievements |
In this study, a microstructure profiling float and EM-APEX floats were deployed along the Kuroshio Extension Front in July 2013. The observed velocity data by EM-APEX floats exhibits banded phase structures of near-inertial internal waves with pronounced thermohaline interleaving structures below 150 m depth along the Kuroshio Extension over 900 km. The measured microstructure data show that the turbulence within the thermohaline interleaving structures was relatively weaker but microscale thermal variance dissipation rates were very large. These results suggest that subinertial and near-inertial shear catalyze the formations of double-diffusion favorable conditions and promote vertical mixing of tracer under the Kuroshio Extension Front. The results from the numerical simulations suggest that these near-inertial waves with large amplitudes can be generated spontaneously from the Kuroshio with no external forcing.
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Report
(5 results)
Research Products
(26 results)
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[Presentation] 乱流計フロート2014
Author(s)
長井健容
Organizer
第1回アルゴユーザーミーティング
Place of Presentation
AMSTEC 東京事務所 共用会議室AB
Related Report
Invited
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