PRELIMINARY REPORT ON SCATTERING LAYER MEASUREMENTS IN THE WESTERN NORTH ATLANTIC.

Preliminary results are presented of bio-acoustic investigations of sound scattering layers in the subtropical western North Atlantic. Methods of data collection and analysis are briefly described. Scattering strengths over a range of frequencies from 1.6 to 20.0 kc/s are presented, as well as the v...

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Bibliographic Details
Main Author: Farquhar, G. B.
Other Authors: NAVAL OCEANOGRAPHIC OFFICE NSTL STATION MS
Format: Text
Language:English
Published: 1966
Subjects:
Physical and Dynamic Oceanography
Acoustics
*OCEANS)
(*UNDERWATER SOUND
(*MARINE BIOLOGICAL NOISE
UNDERWATER SOUND)
PROPAGATION
SCATTERING
UNDERWATER SOUND EQUIPMENT
DETECTION
DIURNAL VARIATIONS
VERY LOW FREQUENCY
MEASUREMENT
ECHO RANGING
SAMPLING
SOUND TRANSMISSION
ATLANTIC OCEAN
SCATTERING LAYERS(MARINE)
North Atlantic
Online Access:http://www.dtic.mil/docs/citations/AD0489500
http://oai.dtic.mil/oai/oai?&verb=getRecord&metadataPrefix=html&identifier=AD0489500
Description
Summary:Preliminary results are presented of bio-acoustic investigations of sound scattering layers in the subtropical western North Atlantic. Methods of data collection and analysis are briefly described. Scattering strengths over a range of frequencies from 1.6 to 20.0 kc/s are presented, as well as the variation of scattering strengths over sunrise and sunset periods, as a function of frequency. Patterns of scattering at 12 kc/s, based on echosounder records, are described briefly, and results are give of cursory examination of biological samples. Scattering strength data are compared with similar data from an area near Bermuda, and the relationship of the differences to the relative abundance of marine life in the two areas is briefly discussed. (Author)

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