Accession Number:

AD0780845

Title:

Low Frequency Sound Attenuation Anomaly in the Ocean: Recent Experimental Measurements.

Descriptive Note:

Technical memo.,

Corporate Author:

NAVAL UNDERWATER SYSTEMS CENTER NEWPORT R I

Personal Author(s):

• Browning,D. G.
• Jones,E. N.
• Mellen,R. H.
• Thorp,W. H.

Report Date:

1971-06-08

Pagination or Media Count:

24.0

Abstract:

Numerous explanations have been put forth for the low frequency sound attenuation anomaly in the oceans. Since laboratory measurements are difficult to perform in the frequency range, a series of experiments were conducted in natural bodies of water to determine the effect of salinity, temperature, pressure and biological activity. The areas in which experiments have been conducted to date are Lake Superior, Lake Tanganyika, Red Sea and Hudson Bay. The results of these experiments are compared with other recent measurements in the Pacific Ocean and Mediterranean Sea. Although significant variations are noted among the sites, no one mechanism appears to be clearly responsible. Author

Descriptors:

• *Sea water
• *Underwater sound
• *Acoustic attenuation
• Correlation techniques
• Salinity
• Temperature
• Pressure
• Marine biology
• Low frequency

Subject Categories:

• Physical and Dynamic Oceanography
• Acoustics

Distribution Statement:

APPROVED FOR PUBLIC RELEASE