Title :
Bioacoustic surveys of planktonic sound scatterers and of their diel and seasonal variability in the northwest Gulf of Mexico
Author :
Zimmerman, R.A. ; Biggs, H.C. ; Anderson, A.L.
Author_Institution :
Dept. of Oceanogr., Texas A&M Univ., College Station, TX, USA
Abstract :
A vessel-mounted 150 kHz acoustic Doppler current profiler (ADCP), which is employed to gather underway data on near-surface current velocity, was used in March and June 1992 to survey plankton stocks using backscattered ADCP signal intensity. Relative backscatter intensity was calibrated with salinity-temperature-depth data from CTD casts to determine an absolute backscatter intensity in decibels (dB) in 8 m bins, from 16 to 320 m. Time versus depth matrices were then constructed to display temporal and spatial patterns of aggregations of sound scatterers
Keywords :
acoustic imaging; acoustic variables measurement; aquaculture; oceanographic regions; oceanographic techniques; sonar; underwater sound; 150 kHz; 16 to 320 m; AD 1992; ADCP; Gulf of Mexico; acoustic Doppler current profiler; acoustic scattering; acoustic survey; backscatter intensity; diel; marine biology; measurement technique; ocean; plankton; season; seasonal variability; sonar; sound scatterer; spatial pattern; temporal variation aggregation; ultrasonics; underwater sound; Acoustic scattering; Backscatter; Biomedical acoustics; Displays; Gratings; Marine vegetation; Robustness; Springs; Transmission line matrix methods;
Conference_Titel :
OCEANS '93. Engineering in Harmony with Ocean. Proceedings
Conference_Location :
Victoria, BC
Print_ISBN :
0-7803-1385-2
DOI :
10.1109/OCEANS.1993.325977
