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Nonlinear excitation of zonal flows by Rossby wave turbulence
Umeå University, Faculty of Science and Technology, Department of Physics. Centre for Fundamental Physics (CfFP), STFC Rutherford Appleton Laboratory, Chilton, Didcot, UK; Institut für Theoretische Physik IV, Ruhr-Universität Bochum, D-44780 Bochum, Germany; SUPA Department of Physics, University of Strathclyde, Glasgow G4 0NG, UK .
2009 (English)In: New Journal of Physics, ISSN 1367-2630, E-ISSN 1367-2630, Vol. 11, 073038Article in journal (Refereed) PublishedText
Abstract [en]

We apply the wave-kinetic approach to study nonlinearly coupled Rossby wave-zonal flow fluid turbulence in a two-dimensional rotating fluid. Specifically, we consider for the first time nonlinear excitations of zonal flows by a broad spectrum of Rossby wave turbulence. Short-wavelength Rossby waves are described here as a fluid of quasi-particles, and are referred to as the 'Rossbyons'. It is shown that Reynolds stresses of Rossbyons can generate large-scale zonal flows. The result should be useful in understanding the origin of large-scale planetary and near-Earth atmospheric circulations. It also provides an example of a turbulent wave background driving a coherent structure.

Place, publisher, year, edition, pages
Bristol: Institute of Physics (IOP), 2009. Vol. 11, 073038
Keyword [en]
instability, plasma
National Category
Fusion, Plasma and Space Physics
URN: urn:nbn:se:umu:diva-115985DOI: 10.1088/1367-2630/11/7/073038ISI: 000268324700002OAI: diva2:907121
Available from: 2016-02-26 Created: 2016-02-08 Last updated: 2016-02-26Bibliographically approved

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Shukla, Padma Kant
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