Accession Number : AD0704486

Title :   A REPORT ON A PRELIMINARY STUDY FOR ACOUSTICALLY MONITORING LARGE-SCALE INTERNAL OCEAN MOVEMENTS.

Descriptive Note : Technical rept.,

Corporate Author : WOODS HOLE OCEANOGRAPHIC INSTITUTION MASS

Personal Author(s) : LaCasce,E. O. , Jr. ; Beckerle,John C.

Report Date : NOV 1969

Pagination or Media Count : 55

Abstract : Long-period ocean movements in the area southwest of Bermuda have been observed. These movements are marked by changes in the main thermocline. A method to relate the fluctuations in the pattern of the early arrivals from a pulsed sound source located near the sound channel axis to these changes is proposed. A preliminary experiment using SUS charges for the source is discussed. In the experiment sound velocity profile observations along three bearings, 280 miles long, only 10 degrees apart, exhibited measurable average differences. The acoustic arrival time comparisons from the SUS charges for the three bearings can be related to the sound velocity differences between the bearings. The preliminary results indicate that the method shows enough promise for monitoring large scale internal ocean fluctuations to warrant further study. (Author)

Descriptors :   (*SOUND TRANSMISSION, ATLANTIC OCEAN), (*OCEAN WAVES, MEASUREMENT), THERMOCLINES, MONITORS, OCEANOGRAPHIC SHIPS, MATHEMATICAL MODELS, TEMPERATURE, HYDROPHONES, BERMUDA

Subject Categories : Physical and Dynamic Oceanography
      Acoustics

Distribution Statement : APPROVED FOR PUBLIC RELEASE