Focusing of internal tides by near-inertial waves

Cuypers, Y.; Bouruet‐Aubertot, P.; Vialard, J.; McPhaden, M. J.

doi:10.1002/2017GL072625

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Focusing of internal tides by near-inertial waves

2017
By Cuypers, Y. ; Bouruet‐Aubertot, P. ; Vialard, J. ; ...
Source: Geophysical Research Letters, 44(5), 2398-2406.

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Journal Title:

Geophysical Research Letters
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Cuypers, Y. ; Bouruet‐Aubertot, P. ; Vialard, J. ; McPhaden, M. J.

Cuypers, Y. ; Bouruet‐Aubertot, P. ; Vialard, J. ; McPhaden, M. J. Less -
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OAR (Oceanic and Atmospheric Research)
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The refraction of internal waves by lower-frequency near-inertial waves has been predicted theoretically, but never observed before. Here, we report observations of semi-diurnal internal tides generated by the rough topography of the Central Indian Ridge, in the presence of a strong, lower-frequency near-inertial wave field generated by a tropical storm. The semi-diurnal internal tide energy is trapped within upward propagating bands with a periodicity close to the inertial period. A ray-tracing model suggests that this trapping results from the internal tide refraction by the shear associated with near-inertial waves. This yields a strong increase of the internal tide energy and shear in space-time regions where the background flow focuses the rays, leading to the formation of caustics. This mechanism may increase vertical mixing generated by baroclinic tides in the vicinity of mid-ocean ridges in tropical regions.
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Geophysical Research Letters, 44(5), 2398-2406.
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https://doi.org/10.1002/2017GL072625
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Journal Article
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urn:sha256:32aced1201476171d449cdd14a70eecd9108f9e3c96a77ab3bc4d53880fb956c
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Focusing of internal tides by near-inertial waves

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