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Can oceanic flows be heard? Abyssal melodies
1Department of Earth and Planetary Sciences, Harvard University, Cambridge, Massachusetts 02138, USA.
The Journal of the Acoustical Society of America
|November 1, 2022
Summary
Oceanic fluid flows create acoustic noise. This study suggests that sounds from baroclinic tidal flows could be detectable across the oceanic spectrum using advanced acoustic array data analysis.
Area of Science:
- Ocean acoustics
- Fluid dynamics
- Geophysics
Background:
- Fluid flows generate acoustic noise fields.
- Oceanic flows produce sound on various scales.
- Detectability of this sound is a key consideration.
Purpose of the Study:
- To analyze the acoustic signature of oceanic flows.
- To determine the detectability of sound generated by baroclinic tidal flows.
- To explore the potential for detecting these acoustic fields.
Main Methods:
- Utilized Lighthill theory for acoustic signature analysis.
- Investigated a simple train of boundary vortices from baroclinic tidal flows.
- Performed a lower bound analysis of the acoustic field.
Main Results:
- The generated sound is predicted to be detectable.
- Detection is feasible within the hum band of seismo-acoustic pressure fields.
- Sound is potentially detectable across the entire oceanic spectrum.
Conclusions:
- Acoustic signatures from specific oceanic flows are theoretically detectable.
- Wave number analyses of acoustic array data may enable detection.
- Further research can refine understanding of oceanic acoustic fields.
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