Abstract
In the three years since the NATO meeting in Lerici (see Kerman 1988) rapid progress has been made in investigating natural sources of underwater sound. A subject that was ripe for investigation has been opened up to physical oceanogra-phers, fluid dynamicists and seismologists, as well as those specializing in underwater sound propagation. In this review I shall deal with only a small part of the total frequency spectrum, that between 1 and 80 kHz. Following pioneer work by Crowther, Prosperetti, Hollett and Heitmeyer and others at the Lerici meeting it has come to be recognised that one of the most important sources of sound in this range is from the oscillations of individual bubbles near the sea surface. Each bubble, when it is formed, emits a short acoustical pulse lasting for a few milliseconds only — a kind of birth yell. In listening to underwater sound at these frequencies we are, it appears, hearing a chorus of such birth yells.
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Longuet-Higgins, M.S. (1993). Bubble Noise Mechanisms — A Review. In: Kerman, B.R. (eds) Natural Physical Sources of Underwater Sound. Springer, Dordrecht. https://doi.org/10.1007/978-94-011-1626-8_33
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DOI: https://doi.org/10.1007/978-94-011-1626-8_33
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