Abstract
A new type of gravity waves associated with the subsurface layers of bubbles existing ubiquitously in the ocean is considered. Due to bubble compressibility, such a layer creates a vertical density gradient. Although the density changes due to bubbles are small, the corresponding gradient can be significant, at least comparable with or even exceeding the natural density gradient due to the temperature or salinity variations. As a result, the bubbles may affect propagation of short-period internal waves or even be exclusively responsible for the internal modes in otherwise homogeneous water. These modes can be strongly localized near the surface and thus contribute to ripple modulation, affect sound propagation, etc. The dispersion equation for the bubble-affected internal waves is derived, and the corresponding modal structures are plotted. Some estimates are made and limitations of the simple model considered under real conditions are discussed.
Published Version
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