Ambient Noise under Sea Ice and Further Measurements of Wind and Temperature Dependence

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Abstract
Measurements of underwater-pressure spectral density from M'Clure Strait (2–5 May 1966), the Beaufort Sea (31 July and 16 August 1965),and the Canada Deep (14 April 1965) are presented. The M'Clure Strait measurements, made under shore-fast sea ice, exhibited a variability related to air-temperature and wind-speed changes of a similar nature to those reported previously for midwinter under-ice noise. The great differences in the magnitude and variation with frequency, of the ambient noise observed under sea ice is again illustrated with three sets of measurements obtained during 1965–1966. The noise observed under the shore-fast ice of M'Clure Strait in the springtime appeared to be governed by air-temperature and wind-speed changes in a similar manner to noise observed previously in the midwinter [J. H. Ganton and A. R. Milne, J. Acoust. Soc. Am. 38, 406–411 (1965)]. On the other hand, measurements made under the moving ice cover of the Canada Deep in the springtime and of the Beaufort Sea in the summer appeared to be less amenable to description in terms of easily observable physical variables.

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