Sound Dispersion and Phase Fluctuations in the Upper Ocean.

Abstract

In-Situ measurements of the speed of sound in the upper ocean have revealed the existence of significant dispersion and large fluctuations over the frequency range 25-80 kHz. The near-surface values of c ranged from +6 M/sec to -3 M/sec relative to the bubble-free value, with a maximum estimated error of 0.5 M/sec. It was possible to identify bubbles of 'surface' radius centered around 54 microns down to 4.3 meter depth as well as a population centered around 124 microns (at 4.3 M) found at all depths. The speed fluctuation showed near-Faussian probability density functions except at the dispersion center frequencies. The standard deviation of the speed varied from 0.27 M/sec for 58.0 kHz to 0.52 M/sec at 69.6 kHz. (Author)

Document Details

Document Type
Technical Report
Publication Date
Feb 01, 1972
Accession Number
AD0738913

Entities

People

  • Juegen Rautmann

Organizations

  • Naval Postgraduate School

Tags

DTIC Thesaurus Topics

  • Computing-Related Activities
  • Data Science
  • Dispersions
  • Frequency
  • Information Science
  • Interdisciplinary Science
  • Mathematical Analysis
  • Mathematics
  • Measurement
  • Probability
  • Probability Density Functions
  • Random Variables
  • Standards

Fields of Study

  • Physics

Readers

  • Aerosol Science/Aerosol Physics
  • Atmospheric Science / Meteorology, specifically Wind Wave Turbulence.