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Ocean acoustic reverberation tomography.

Robert A Dunn1

  • 1Department of Geology and Geophysics, School of Ocean and Earth Science and Technology, University of Hawaii at Manoa, 1680 East-West Road, Honolulu, Hawaii 96822, USA.

The Journal of the Acoustical Society of America
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Ocean acoustic reverberation tomography uses wave travel times to image underwater sound speed. This method reveals small-scale ocean thermal structure, advancing understanding of ocean heat content and mixing processes.

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Area of Science:

  • Oceanography
  • Marine geophysics
  • Acoustics

Background:

  • Seismic wide-angle imaging commonly explores Earth's subsurface using ocean bottom seismographs.
  • Oceanic studies are often dominated by acoustic waves and reverberations within the water column.
  • Dense receiver spacing (<10 km) allows for detailed sampling of water column properties.

Purpose of the Study:

  • To develop and present ocean acoustic reverberation tomography as a novel method for imaging ocean acoustic structure.
  • To provide an alternative approach for determining ocean structure and understanding heat content and mixing.
  • To demonstrate the potential for revealing small-scale ocean thermal variations.

Main Methods:

  • Utilizes travel times of direct and reflected acoustic waves recorded by ocean bottom seismographs.
  • Applies a technique called ocean acoustic reverberation tomography.
  • Leverages dense receiver spacing to densely sample the acoustic wave field.

Main Results:

  • Successfully developed ocean acoustic reverberation tomography.
  • Demonstrated potential for imaging small-scale ocean thermal structure throughout the water column.
  • Capable of producing higher-resolution sound speed images compared to traditional acoustic tomography.

Conclusions:

  • Ocean acoustic reverberation tomography offers a powerful new tool for ocean exploration.
  • The technique enhances understanding of ocean heat content and mixing processes.
  • It provides detailed insights into small-scale ocean thermal structures over large areas.