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Chaotic stirring by a mesoscale surface-ocean flow.

Edward R. Abraham1, Melissa M. Bowen

  • 1National Institute of Water and Atmospheric Research (NIWA), P.O. Box 14-901, Kilbirnie, Wellington, New Zealand.

Chaos (Woodbury, N.Y.)
|June 5, 2003
PubMed
Summary

Scientists calculated ocean stirring using satellite data in the East Australian Current. They found stirring rates consistent with other ocean measurements and analyzed sea surface temperature patterns.

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Area of Science:

  • Oceanography
  • Fluid Dynamics
  • Remote Sensing

Background:

  • The East Australian Current is a significant oceanographic feature.
  • Understanding horizontal stirring is crucial for predicting tracer transport in the ocean.

Purpose of the Study:

  • To quantify the horizontal stirring properties of the East Australian Current.
  • To analyze sea surface temperature patterns using theoretical models of advected tracers.

Main Methods:

  • Derived a surface velocity field from remotely sensed data using the maximum cross-correlation method.
  • Integrated the velocity field to compute finite-time Lyapunov exponents.
  • Applied theoretical results on multifractal spectra of advected tracers to analyze sea surface temperature images.

Main Results:

  • Estimated the mean Lyapunov exponent (stirring rate) in the study region to be 4x10^-7 s^-1.
  • Observed a strong agreement between the spatial patterns in sea surface temperature images and modeled advected tracers.
  • Estimated the response timescale of the sea surface temperature to surface forcing to be approximately 20 days.

Conclusions:

  • The calculated stirring rates are consistent with existing measurements in the surface ocean.
  • Sea surface temperature patterns can be effectively analyzed using models of advected tracers, providing insights into ocean dynamics.
  • The study demonstrates the utility of remote sensing and theoretical modeling for understanding ocean stirring and tracer transport.

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