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Oceanic mass transport by mesoscale eddies.

Zhengguang Zhang1, Wei Wang2, Bo Qiu3

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Mesoscale eddies significantly transport ocean mass, comparable to major currents. This eddy-driven transport is crucial for understanding ocean circulation and climate regulation.

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Area of Science:

  • Oceanography
  • Climate Science
  • Fluid Dynamics

Background:

  • Ocean circulation, including heat and salt transport, is vital for global climate regulation and marine resource distribution.
  • While large-scale currents dominate fluid transport, mesoscale eddies also play a role in moving water parcels.

Purpose of the Study:

  • To quantify the contribution of mesoscale eddies to zonal mass transport in the ocean.
  • To compare eddy-induced transport with established ocean circulation patterns.

Main Methods:

  • Utilized satellite altimetry data to identify and track mesoscale eddies.
  • Integrated profiling float data from the Argo program to measure fluid properties and movement.
  • Combined datasets to calculate eddy-induced zonal mass transport.

Main Results:

  • Eddy-induced zonal mass transport can reach 30-40 sverdrups (Sv).
  • This significant transport is primarily observed in subtropical regions with weaker background flows.
  • The magnitude of eddy transport is comparable to large-scale wind- and thermohaline-driven circulation.

Conclusions:

  • Mesoscale eddies represent a substantial, previously underestimated, component of ocean mass transport.
  • Understanding eddy dynamics is essential for accurate climate modeling and predicting marine resource distribution.