Preprints
https://doi.org/10.5194/os-2020-112
https://doi.org/10.5194/os-2020-112

  16 Dec 2020

16 Dec 2020

Review status: a revised version of this preprint was accepted for the journal OS and is expected to appear here in due course.

Temporal and spatial variations in three-dimensional seismic oceanography

Zheguang Zou1,2, Parsa Bakhtiari Rad2, Leonardo Macelloni3, and Likun Zhang1,2 Zheguang Zou et al.
  • 1Department of Physics and Astronomy, University of Mississippi, University, MS 38677
  • 2National Center for Physical Acoustics, University of Mississippi, 145 Hill Drive, University, MS 38677
  • 3Hydrographic Science Research Center, School of Ocean Science and Engineering, The University of Southern Mississippi, 1020 Balch Blvd., Stennis Space Center, MS 39529

Abstract. Seismic oceanography is a new cross-discipline between geophysics and oceanography that uses seismic reflection data to image and study the ocean water column. Previous works on seismic oceanography were largely limited to two-dimensional seismic data and methods. We present a complete three-dimensional (3D) oceanic seismic study and explore its imaging capability in seismic oceanography. From a 3D multichannel seismic survey acquired for oil and gas exploration in the Gulf of Mexico over six months period, a 3D water-column seismic volume was derived. The 3D seismic volume exhibits both temporal and spatial variations of the ocean, and theoretical and empirical analyses were performed to discriminate their contribution. Our analyses shows that temporal variation is largely embedded along crossline direction, hence deteriorating the quality of seismic images; however, inline sections, which can be seen as snapshot representation of the water column, allow to capture not only thermohaline structure but also the temporal evolution of the ocean dynamics. Our finding highlights that appropriately processed and analyzed 3D seismic data not only provide superior images of the ocean structure but also can be useful for investigation of temporal evolution of mesoscale ocean dynamics.

Zheguang Zou et al.

 
Status: closed
Status: closed
AC: Author comment | RC: Referee comment | SC: Short comment | EC: Editor comment
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Status: closed
Status: closed
AC: Author comment | RC: Referee comment | SC: Short comment | EC: Editor comment
Printer-friendly Version - Printer-friendly version Supplement - Supplement

Zheguang Zou et al.

Zheguang Zou et al.

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Short summary
This study presents the three-dimensional imaging of a large ocean volume in the Gulf of Mexico. We found that the time variation barely affects imaging in the survey vessel's sailing direction, but heavily affects the imaging perpendicular to the sailing direction. Most importantly, the obtained ocean volume represents a series of snapshots of the ocean revealing the evolution of ocean structures over time. This research provides essential understanding for 3D seismic oceanography.