A mechanism of deep-ocean mixing due to near-inertial waves generated by flow over bottom topography |
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Authors: | Akira Kasahara |
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Institution: | 1. Department of Marine Environment and Engineering, National Sun Yat-Sen University, Kaohsiung 804, Taiwan;2. International Wave Dynamics Research Center, National Cheng Kung University, Tainan 701, Taiwan;3. Department of Hydraulics and Ocean Engineering, National Cheng Kung University, Tainan 701, Taiwan;4. Tainan Hydraulics Laboratory, National Cheng Kung University, Tainan 701, Taiwan |
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Abstract: | This article describes a remarkable effect of the horizontal component of the Coriolis vector, which is traditionally neglected in geophysical fluid wave theory, for the generation of inertio-gravity waves caused by flow over topography. Earlier an initial-value approach was used to calculate the evolutions of internal waves generated by atmospheric forcing in the linear Boussinesq model as done by many investigators for the study of near-inertial waves in the ocean. In this study, however, we focused on the mechanism of generating near-inertial waves by a bottom forcing with various periods. It is shown that the non-traditional Coriolis effects can significantly enhance the generation of near-inertial waves. Moreover, the intensity of generated near-inertial waves increases as the period of bottom forcing approaches to the local inertial period, suggesting the importance of tidal flows for generating near-inertial waves in deep ocean near critical latitudes. It is inferred that such near-inertial waves may contribute to a mechanism of deep-ocean mixing. |
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