Acoustic Volume Scattering at the Bermuda Ocean Acre Site During Spring and Summer 1970 and Summer 1971 (Cruises 9, 10, and 12).

• Main Authors: Fisch,Norbert P., Dullea,Robert K.
• Other Authors: NAVAL UNDERWATER SYSTEMS CENTER NEWPORT R I
• Format: Text
• Language: English
• Published: 1973
• Subjects: Physical and Dynamic Oceanography; Acoustic Detection and Detectors; Acoustics; (*UNDERWATER SOUND; SCATTERING); (*SONAR SIGNALS; EXTREMELY LOW FREQUENCY; REVERBERATION; ATLANTIC OCEAN; NORTH ATLANTIC OCEAN; AGOR 6 VESSEL; North Atlantic
• Online Access: http://www.dtic.mil/docs/citations/AD0761976; http://oai.dtic.mil/oai/oai?&verb=getRecord&metadataPrefix=html&identifier=AD0761976

Results of acoustic studies of the marine organisms of the sound scattering layers at the Bermuda Ocean Acre site are presented for the USNS SANDS' (T-AGOR-6) Cruises 9 and 10 in the spring and summer of 1970, respectively, and Cruise 12 in the late summer of 1971. On Cruises 9 and 10, reverberation was measured at 3.85, 13.5, and 15.5 kHz. On Cruise 12, frequency coverage was extended to include 1.3 and 5, 7, and 9 kHz. Upward-looking transducer-reflector systems operating at 1.3 and 3.85 kHz made it possible to survey in detail the upper 50 m of the water. This report presents the characteristics of the SSL in terms of scattering-strength-versus-depth profiles and integrated scattering strengths. Day-to-day variability and diurnal variations are considered and frequency dependence and seasonal effects are discussed. (Author)