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Characterizing wind-dependent low-frequency ambient sound with ocean observatories initiative hydrophones
1Applied Ocean Physics & Engineering, Woods Hole Oceanographic Institution, Woods Hole, Massachusetts 02540, USA.
None:
This study characterizes the statistical dependence of low-frequency ambient sound on wind speed using 8 years of Ocean Observatories Initiative hydrophone data. Data from two bottom-mounted hydrophones, sampled at 200 Hz, are compared to a National Oceanic and Atmospheric Administration surface winds model. One hydrophone is on the continental slope and one is in open ocean. Wind dependence on ambient sound levels is reported for both locations across all studied frequencies (0.1-90 Hz). A piecewise, log-linear model is fit to ambient sound and wind speed, and different regions of wind dependence are discussed. Directional surface wave spectra from a nearby buoy are compared with acoustic measurements below 1.2 Hz. Time-frequency characteristics in acoustic data are largely explained by local surface spectra.
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