Acoustic scattering from density and sound speed gradients : modeling of oceanic pycnoclines
Lavery, Andone C.
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KeywordAcoustic wave scattering; Acoustic wave velocity; Hydrophones; Oceanographic equipment; Oceanographic techniques; Remote sensing; Sonar; Underwater sound
A weak-scattering model that allows prediction of acoustic scattering from oceanic pycnoclines (and the accompanying sound speed gradients) based on hydrographic profiles is described. Model predictions, based on profiles from four locations, indicate that scattering from oceanic pycnoclines is measurable using standard scientific sonars operating at frequencies up to 200 kHz but generally only for pycnocline thicknesses less than 10 m. Accurate scattering models are key to assessing whether acoustic remote sensing can be used to map oceanic pycnoclines and for determining whether scattering from pycnoclines needs to be taken into account when estimating, for instance, zooplankton abundance from acoustic data.
Author Posting. © Acoustical Society of America, 2012. This article is posted here by permission of Acoustical Society of America for personal use, not for redistribution. The definitive version was published in Journal of the Acoustical Society of America 131 (2012): EL54-EL60, doi:10.1121/1.3669394.
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