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Area of Science:

  • Oceanography
  • Fluid Dynamics

Background:

  • Surface eddies are commonly observed, but deep eddies lack surface signatures, making them difficult to detect.
  • Deep eddies are underreported due to observational challenges.

Purpose of the Study:

  • To detect and characterize a deep, energetic, and baroclinic eddy in the northwestern South China Sea.
  • To understand the generation mechanism and implications of deep eddies.

Main Methods:

  • Utilized current and temperature data collected by mooring arrays.
  • Analyzed the intensity, size, polarity, and structure of the detected deep eddy.

Main Results:

  • A deep eddy was identified, deepening isotherms by ~120m and inducing maximal velocities of 0.18m/s.
  • The eddy was generated in the wake of a seamount, influenced by upper-layer flow and a surface cyclonic eddy.
  • The deep eddy's characteristics suggest it is not an isolated event.

Conclusions:

  • Deep eddies significantly enhance velocity intensity and mixing in the deep ocean.
  • Deep eddies may play a role in deep-sea sediment transport.