Abstract
It is now widely acknowledged that wind-induced oceanic ambient noise comes from ringing bubbles formed by breaking waves at the ocean’s surface. The numbers, sizes, creation rates, and spatial distribution of these bubbles are all important in determining the acoustic radiation signature of a breaking wave. Results from an experiment to measure the bubble size distribution within open-ocean whitecaps and simultaneously record the burst of sound radiated by forming whitecaps will be presented. The bubble size distribution measurements were made with an optical instrument mounted within 0.5 m of the ocean’s surface beneath a surface-following frame. The instrument is capable of resolving the time-evolving bubble size distribution on millisecond time scales and centimeter length scales within a whitecap. The simultaneous optical and acoustical measurements are important for modeling the sound of breaking waves in the open ocean and the surf zone. [Work supported by ONR and NSF.]
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