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Article
On the Arrest of Inverse Energy Cascade and the Rhines Scale
Journal of the Atmospheric Sciences
  • Semion Sukoriansky, Ben-Gurion University of the Negev
  • Nadejda Dikovskaya, Ben-Gurion University of the Negev
  • Boris Galperin, University of South Florida
Document Type
Article
Publication Date
1-1-2007
Keywords
  • Turbulence,
  • Rossby waves
Digital Object Identifier (DOI)
https://doi.org/10.1175/JAS4013.1
Disciplines
Abstract

The notion of the cascade arrest in a β-plane turbulence in the context of continuously forced flows is revised in this paper using both theoretical analysis and numerical simulations. It is demonstrated that the upscale energy propagation cannot be stopped by a β effect and can only be absorbed by friction. A fundamental dimensional parameter in flows with a β effect, the Rhines scale, LR, has traditionally been associated with the cascade arrest or with the scale that separates turbulence and Rossby wave–dominated spectral ranges. It is shown that rather than being a measure of the inverse cascade arrest, LR is a characteristic of different processes in different flow regimes. In unsteady flows, LR can be identified with the moving energy front propagating toward the decreasing wavenumbers. When large-scale energy sink is present, β-plane turbulence may attain several steady-state regimes. Two of these regimes are highlighted: friction-dominated and zonostrophic. In the former, LR does not have any particular significance, while in the latter, the Rhines scale nearly coincides with the characteristic length associated with the large-scale friction. Spectral analysis in the frequency domain demonstrates that Rossby waves coexist with turbulence on scales smaller than LR thus indicating that the Rhines scale cannot be viewed as a crossover between turbulence and Rossby wave ranges.

Citation / Publisher Attribution

Journal of the Atmospheric Sciences, v. 64, issue 9, p. 3312-3327

Citation Information
Semion Sukoriansky, Nadejda Dikovskaya and Boris Galperin. "On the Arrest of Inverse Energy Cascade and the Rhines Scale" Journal of the Atmospheric Sciences Vol. 64 Iss. 9 (2007) p. 3312 - 3327
Available at: http://works.bepress.com/boris-galperin/41/