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Internal Solitary Wave Reflection Near Dongsha Atoll, the South China Sea
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2017
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Source: Journal of Geophysical Research: Oceans, 122(10), 7978-7991
[PDF-3.73 MB]
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Journal Title:Journal of Geophysical Research: Oceans
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Description:Internal solitary wave (ISW) reflection is rarely observed in satellite images, even in the South China Sea (SCS), where the strongest and most energetic ISWs in the world have been observed. Compared to the large number of satellite images showing shoaling ISW in the SCS, fewer than 10 satellite imageshave been reported showing ISW reflection. In this study, we collect recent satellite images and implement a numerical model to analyze ISW reflection near Dongsha Atoll, in the SCS. Satellite observations show that the reflection appears to be associated with the large-amplitude ISWs generated by strong tidal currents inLuzon Strait. Numerical simulations show that ISWs break when reaching the sloping bottom. Part of ISW energy is reflected by mode-1 waves and their trailing mode-2 waves. The mode-1 waves have two types: long inertia-gravity waves and breaking ISW-induced short waves. They propagate quickly but induce weakvertical velocity and surface imprints. Mode-2 waves induce strong vertical velocity, showing visible signa-
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Source:Journal of Geophysical Research: Oceans, 122(10), 7978-7991
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ISSN:2169-9275
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