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The Deep Scattering Layer

Published online by Cambridge University Press:  18 January 2010

G. S. Ritchie
G. S. Ritchie
Affiliation:
(Admiralty Hydrographic Department)
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Extract

At depths of, generally, between 20 and 250 fathoms in the oceans, sonic and ultrasonic transmissions are frequently scattered by a layer which can be detected on the echo sounding trace, sometimes so strongly as to suggest a sea-bed echo. The cause of this layer, of which the depth has been observed to rise at sunset and sink at sunrise, is not precisely known, though it is generally thought to be biological. Investigations into the deep scattering layer (DSL), as it is called, are being conducted in many countries, principally in the United States, France and Great Britain, and a recent paper by Tchernia has set out the present state of knowledge on the subject.

Type
Research Article
Information
The Journal of Navigation , Volume 6 , Issue 4 , October 1953 , pp. 395 - 402
Copyright
Copyright © The Royal Institute of Navigation 1953

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References

REFERENCES

1Tchernia, P. (1952). Remarks concerning the present state of the deep scattering layer problem. Reproduced from Bulletin d'Information du Comité Central d'Océanographie et d'Etude des Côtes, 4, No. 10, in Hydrogr. Rev. 30, 135.Google Scholar
2Ritchie, G. S. (1952). H.M.S. Challenger's investigations in the Pacific Ocean. This Journal, 5, 251.Google Scholar
3Totton, A. K. Siphonophora of the Indian Ocean. ‘Discovery’ Rep. (in press).Google Scholar
4Tucker, G. H. (1951). Relation of fishes and other organisms to the scattering of underwater sound. J. Mar. Res. 10, 215.Google Scholar
5Marshall, N. B. (1951). Bathypelagic fishes as sound scatterers in the ocean. J. Mar. Res. 10, 1.Google Scholar