Resolution of Low-Frequency Attenuation Anomalies in the Southern Hemisphere

Abstract

During Project Kiwi One, anomalously high values of low-frequency attenuation were observed in the central South Pacific Ocean. Similar results were obtained along the track from New Zealand into the Southern Ocean during Project Tasman Two. A recent analysis of oceanographic data by Mellen shows that both regions are included in a relatively high pH contour at the sound channel axis. The corresponding predicted values of attenuation are in reasonable agreement with the measured data. Keywords: Underwater sound absorption; Acoustic attenuation; pH factor; Sea water.

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Document Details

Document Type
Technical Report
Publication Date
Jun 01, 1987
Accession Number
ADA181754

Entities

People

  • D. G. Browning
  • K. M. Guthrie
  • R. H. Mellen
  • R. N. Denham
  • R. W. Bannister

Organizations

  • Naval Underwater Systems Center

Tags

DTIC Thesaurus Topics

  • Absorption
  • Acoustic Attenuation
  • Attenuation
  • Classification
  • Frequency
  • Hemispheres
  • New Zealand
  • Oceanography
  • Oceans
  • Pacific Ocean
  • Sea Water
  • Security
  • South Pacific Ocean
  • Southern Hemisphere
  • Southern Ocean
  • Water Masses

Readers

  • Acoustical Oceanography.
  • Oceanography.