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

摘要

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)