Arctic Ocean Background Noise Caused by Ridging of Sea Ice.

Abstract

A new method is presented to explain how noise is generated under pack ice by ridging of the pack ice. The energy dissipated during the ridging process is assumed to be the proper measure of the noise source level. Noise source levels generated by ridging are simulated. Noise intensity at a specific site is calculated by summing signals from all these sources after accounting for propagation losses. Calculations are made to compare this simulated noise with observations for an experiment conducted during the winter of 1975-76 in the Beaufort Sea. During a 120-day period, 46% of the intensity of the noise signal is explained using this process, and over several 20-day periods, in excess of 64% is explained. In addition to explaining a significant amount of energy and ambient noise, the model is attractive on physical grounds and properly explains lack of noise when winds are high but ice is strong enough to resist ridging.

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Document Details

Document Type
Technical Report
Publication Date
Jul 01, 1983
Accession Number
ADA159587

Entities

People

  • R. S. Pritchard

Tags

Communities of Interest

  • Energy and Power Technologies
  • Materials and Manufacturing Processes
  • Weapons Technologies

DTIC Thesaurus Topics

  • Acoustic Propagation
  • Acoustic Signals
  • Acoustic Waves
  • Acoustics
  • Ambient Noise
  • Arctic Ocean
  • Background Noise
  • Barometric Pressure
  • Beaufort Sea
  • Computational Science
  • Measurement
  • Mechanical Energy
  • Mechanics
  • Military Research
  • Oceans
  • Pressure Gradients
  • Ridges

Readers

  • Atmospheric Science / Meteorology, specifically Wind Wave Turbulence.
  • Polar and Arctic Studies
  • Radio communications and signal processing.