Measurements of acoustic scattering from zooplankton and oceanic microstructure using a broadband echosounder
Lavery, Andone C.
Moum, James N.
MetadataShow full item record
In principle, measurements of high-frequency acoustic scattering from oceanic microstructure and zooplankton across a broad range of frequencies can reduce the ambiguities typically associated with the interpretation of acoustic scattering at a single frequency or a limited number of discrete narrowband frequencies. With this motivation, a high-frequency broadband scattering system has been developed for investigating zooplankton and microstructure, involving custom modifications of a commercially available system, with almost complete acoustic coverage spanning the frequency range 150–600 kHz. This frequency range spans the Rayleigh-to-geometric scattering transition for some zooplankton, as well as the diffusive roll-off in the spectrum for scattering from turbulent temperature microstructure. The system has been used to measure scattering from zooplankton and microstructure in regions of non-linear internal waves. The broadband capabilities of the system provide a continuous frequency response of the scattering over a wide frequency band, and improved range resolution and signal-to-noise ratios through pulse-compression signal-processing techniques. System specifications and calibration procedures are outlined and the system performance is assessed. The results point to the utility of high-frequency broadband scattering techniques in the detection, classification, and under certain circumstances, quantification of zooplankton and microstructure.
© 2009 The Authors. This article is distributed under the terms of the Creative Commons Attribution Non-Commercial License. The definitive version was published in ICES Journal of Marine Science: Journal du Conseil 67 (2010): 379-394, doi:10.1093/icesjms/fsp242.
The following license files are associated with this item:
Except where otherwise noted, this item's license is described as http://creativecommons.org/licenses/by-nc/2.5/uk/
Showing items related by title, author, creator and subject.
Observations of broadband acoustic backscattering from nonlinear internal waves : assessing the contribution from microstructure Lavery, Andone C.; Chu, Dezhang; Moum, James N. (IEEE, 2010-11-30)In this paper, measurements of high-frequency broadband (160-590 kHz) acoustic backscattering from surface trapped nonlinear internal waves of depression are presented. These waves are ideal for assessing the contribution ...
High-frequency acoustic scattering from turbulent oceanic microstructure : the importance of density fluctuations Lavery, Andone C.; Schmitt, Raymond W.; Stanton, Timothy K. (Acoustical Society of America, 2003-11)Acoustic scattering techniques provide a unique and powerful tool to remotely investigate the physical properties of the ocean interior over large spatial and temporal scales. With high-frequency acoustic scattering it is ...
Anisotropy in high-frequency broadband acoustic backscattering in the presence of turbulent microstructure and zooplankton Leong, Doris; Ross, Tetjana; Lavery, Andone C. (Acoustical Society of America, 2012-08)High-frequency broadband (120–600 kHz) acoustic backscattering measurements have been made in the vicinity of energetic internal waves. The transducers on the backscattering system could be adjusted so as to insonify the ...