Abstract
Experimental evidence suggests that the ambient acoustic noise in the Arctic Ocean below the marginal ice zone (MIZ) is generated by the clashing of ice floes on the sea surface. The noise is spiky in character, with a spectral density over the frequency range from 50 Hz to 1 kHz which varies with frequency as f -n , where the index n varies slowly with time, showing an average value approximately equal to 2. Over a period of five days or so, n was observed to vary between a low value of 1.0 and a high value of 3.0. A theoretical model of the MIZ ambient noise is presented, based on a floe/floe collision mechanism, which predicts time series and spectra whose features are broadly consistent with those observed in the data.
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