Abstract
Near‐coincident ambient noise and wind speed measurements were made over a frequency range 2–20 Hz on a 3400‐m‐deep bottom‐mounted hydrophone in the North Atlantic for wind speeds between 5 and 50 knots. Above about 5 Hz, spectrum levels were dependent on wind speed, w, and frequency, f, approximately as w4/f2. The wind speed dependence is in reasonable agreement with the theory of noise generation through near‐surface atmospheric turbulent pressure fluctuations. The observed spectral shape differs from previous measurements and may be site‐dependent. Below about 5 Hz, the measured wind‐dependence of spectrum levels was consistent with computations based on (1) the theory of noise generation by nonlinear interaction of surface waves propagating in opposite directions, (2) Hasselman's prescription for the wind dependence of the surface wave spectrum [J. Phys. Ocean. 6, 200–228 (1976)], and (3) Tyler's characterization of the directionality of the sea surface wave field [Deep Sea Res. 21, 989–1016 (1974)]. ...
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