2011 Fiscal Year Final Research Report
Quantification of boundary mixing using expendable microstructure profilers for the deep ocean and its incorporation into the global thermohaline circulation model
| Project/Area Number |
21340135
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| Research Category |
Grant-in-Aid for Scientific Research (B)
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| Allocation Type | Single-year Grants |
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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 |
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| Co-Investigator(Renkei-kenkyūsha) |
ISODA Yutaka 北海道大学, 水産科学研究科, 准教授 (10193393)
KITADE Yujiro 東京海洋大学, 海洋科学部, 准教授 (50281001)
HASUMI Hiroyasu 東京大学, 大気海洋研究所, 教授 (40311641)
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| Project Period (FY) |
2009 – 2011
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| Keywords | 乱流散逸 / 潮汐流 / 海底地形 / 内部重力波 / 超深海 / パラメタリゼーション / 非線形相互干渉 / 深層海洋大循環 |
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| Research Abstract |
The global mapping of diapycnal diffusivities in the deep ocean is essential for accurate modeling of global thermohaline circulation. Nevertheless the global distribution of diapycnal diffusivities below a depth of ～2000 m remains unknown. In order to clarify this, we have deployed a free-fall multi-scale profiler VMP-5500 thatcan measure microscale turbulence as well as the background fine-scale shear and strain from the sea surface down to a depth of ～6000 m. Using a combination of the fine-scale and microscale data thus obtained simultaneously together with the aid of the concurrent numerical simulation of internal waves which are generated by tidal interaction with abyssal rough bottom and propagate through the background shear and strain fields, we have succeeded in developing an empirical formula for diapycnal diffusivities near abyssal rough sea beds expressed in terms of fine-scale parameters.
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