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A Simple and Accurate Formula for the Absorption of Sound in Seawater

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Author: Moll, C.A.M. van · Ainslie, M.A. · Vossen, R. van
Type:article
Date:2009
Institution: TNO Defensie en Veiligheid
Source:IEEE Journal of Oceanic Engineering, October, 4, 34, 610-616
Identifier: 248179
doi: doi:10.1109/JOE.2009.2027800
Keywords: Physics · Absorption in seawater · Sound attenuation · Measurements · Formulas

Abstract

In this communication, a new empirical formula for the absorption of sound in seawater is derived. The starting point of this investigation is the formula proposed by Ainslie and Mc- Colm for attenuation due to the boron and magnesium relaxations. Constants in the expression are treated as parameters to be determined. Since this is a nonlinear inverse problem, a global search is used to find the parameter setting that yields the best fit to in situ absorption measurements. The obtained formula is simpler than and at least as accurate as the widely used absorption formula of François and Garrison (FG).