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Area of Science:

  • Oceanography
  • Marine Geology
  • Sedimentology

Background:

  • Mesoscale eddies are known for upper ocean transport and biogeochemical cycling.
  • Their influence on deep-sea sediment dynamics remains largely unexplored.
  • Recent assessments consider eddies in deep-sea hydrodynamic variability.

Purpose of the Study:

  • To investigate the influence of mesoscale eddies on deep-sea sediment transport.
  • To provide the first observation of eddy-driven sediment movement in a deepwater environment.
  • To quantify sediment transport associated with mesoscale eddies in the northern South China Sea.

Main Methods:

  • Deployment of a full-water column mooring system at 2100 m water depth.
  • Monitoring of hydrodynamics (velocity, temperature) and suspended sediment concentration.
  • Analysis of data during the passage of two distinct anticyclonic mesoscale eddies.

Main Results:

  • Observed simultaneous or lagging increases in suspended sediment concentration correlated with eddy passage.
  • Identified southwestward propagation of deep-reaching anticyclonic eddies.
  • Estimated a net near-bottom southwestward sediment transport of up to one million tons from two eddy events.

Conclusions:

  • Surface-generated mesoscale eddies play a significant role in deepwater sedimentary processes.
  • Mesoscale eddies can trap and transport sediments over long distances in the deep sea.
  • This study establishes a novel connection between upper ocean phenomena and deep-sea sediment dynamics.