Abstract
The vertical directionality of the ambient noise field was measured at a site between Cape Hatteras and Bermuda over the frequency range 45–100 Hz. The noise level was observed to decrease rapidly at angles beyond ±20 ° from the horizontal by as much as 20 dB. Slight peaks were observed near ±15 ° and at the horizontal. These peaks are hypothesized to be due to deep ocean shipping and slope enhanced signals from shipping located on the continental shelf edge, respectively. Theoretical calculations based on a parabolic equation propagation model and measured environmental information support these hypotheses.
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