Accession Number : ADA268659


Title :   The Biological Contribution to the Ambient Noise in Waters Near Australia


Corporate Author : MATERIALS RESEARCH LABS ASCOT VALE (AUSTRALIA)


Personal Author(s) : Cato, Douglas H


Report Date : Jan 1993


Pagination or Media Count : 7


Abstract : A major component of the ambient noise in oceans and seas near Australia logical sources. Invertebrates, fish and whales produce a wide variety of sounds that have a significant affect on the performance of sonar and other uses of sound in the ocean. Choruses that result when large numbers of individuals are calling commonly cause levels to rise by about 20 dB, and at times more than 30 dB, over different parts of the frequency range 50 Hz to 5 KHz. Their distribution and occurrence is complex because they depend on the behaviour, habitats and migrations of the animals responsible, but are intrinsically predictable. Some whale sounds are so intense that they are detectable as individual transients for some tens of kilometers.


Descriptors :   *OCEANS , *AUSTRALIA , *UNDERWATER ACOUSTICS , *AMBIENT NOISE , FREQUENCY , TRANSIENTS , REPRINTS , DISTRIBUTION , SONAR , WHALES , NOISE(SOUND) , FISHES , HABITATS , INVERTEBRATES , NUMBERS , SOUND , MIGRATION , ANIMALS , NOISE


Subject Categories : Physical and Dynamic Oceanography
      Acoustics


Distribution Statement : APPROVED FOR PUBLIC RELEASE