Comments on “acoustic scattering by an air bubble near the sea surface” [and reply]

The author comments on the paradoxical result of Gaunaurd and Huang (see ibid., vol.20, p.285, 1992) that the scattering form function of a bubble increases with decreasing distance from a pressure-release surface. Gaunaurd et al. agree with the comments and explanation made by Strasberg (see J. Acoust. Soc. Amer., vol.25, p.536, 1953), adding that they had only accounted for radiation damping in their analysis. Although radiation damping suffices to accurately predict the resonance shift of the bubble as it approaches the free surface, the resonance amplitudes differ from those intuitively expected