EGU General Assembly 2021
© Author(s) 2021. This work is distributed under
the Creative Commons Attribution 4.0 License.

An ensemble-based eddy and spectral analysis, with application to the Gulf Stream

William K. Dewar1,2, Quentin Jamet1, Takaya Uchida1, and Andrew Poje3
William K. Dewar et al.
  • 1IGE/CNRS, UGA, Grenoble, FR(
  • 2EOAS, FSU, Tallahassee, FL, USA
  • 3Dept of Mathematics, CSI, New York, New York, USA

The `eddying' ocean, recognized for several decades, has been the focus of much observational and theoretical research.  We here describe a generalization for the analysis of eddy energy, based in the use of ensembles, that  addresses two key related issues: the definition of an `eddy' and the general computation of energy spectra. An ensemble identifies eddies as the unpredictable component of the flow, and permits the scale decomposition of their energy in inhomogeneous and non-stationary settings. It also avoids the `tapering' or `windowing' of the data required by traditional approaches. We apply the analysis to a mesoscale resolving  (1/12 degree) ensemble of the separated North Atlantic Gulf Stream. Our results show that the eddies are consistent with the theoretical predictions of quasi-geostrophy both at the surface and ocean interior. 

How to cite: Dewar, W. K., Jamet, Q., Uchida, T., and Poje, A.: An ensemble-based eddy and spectral analysis, with application to the Gulf Stream, EGU General Assembly 2021, online, 19–30 Apr 2021, EGU21-2447,, 2021.

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