Abstract
Low‐frequency ambient noise sources observed in the Arctic are discretely located in space and time. With a large number of events per unit area per unit time, the total number of contributions to any one observation grows with horizontal range but also shrinks in intensity inversely with range. This standoff therefore suggests that limits on observed ambient noise are set by basin bathymetry and/or by sound absorption. In one useful model we find the source spectral density typical of low‐frequency events is changed via the basin by an f2 shaping at frequencies below, and by an f−1 shaping at frequencies above a characteristic frequency. [Work supported by ONR.]
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