Accession Number : ADA018689

Title :   A Summary Report of Progress in the Ocean Acre Program,

Corporate Author : NAVAL UNDERWATER SYSTEMS CENTER NEW LONDON CONN NEW LONDON LAB

Personal Author(s) : Brown,C. L. ; Brooks,A. L.

Report Date : 30 JAN 1974

Pagination or Media Count : 53

Abstract : The Ocean Acre program is a long-term, multidiscipline research project designed to study the acoustic and biological characteristics of the Deep Scattering Layer(s) (DSL) in a one-degree quadrangle (the 'Acre') of open ocean water located near Bermuda. During the fourteen cruises in the area, more than 300 fish species from 80 families were collected. Approximately 90% of these specimens belong to the following four families: Myctophidae, melamphaidae, sternoptychidae, and gonostomatidae. Acoustic measurements taken at discrete frequencies from 1.3 to 15.5 kHz showed that the scattering strengths and depths of the DSL remained fairly constant from day-to-day and night-to-night. A mathematical model has been developed that provides a computer printout of scattering strengths and resonant frequencies. A comprehensive bibliography and a listing of the various research investigations being carried out with Ocean Acre material follow the text.

Descriptors :   *Marine biological noise, *Fishes, Deep water, Acoustic measurement, Acoustic scattering, Density, Sea water, Mathematical models, Stratification, Profiles, Bibliographies, North Atlantic Ocean, Bermuda, Extremely low frequency, Very low frequency, Underwater sound, Depth

Subject Categories : Biology
      Biological Oceanography
      Acoustic Detection and Detectors
      Acoustics

Distribution Statement : APPROVED FOR PUBLIC RELEASE