Nonlinear excitation of zonal flows by Rossby wave turbulence

Details Nonlinear excitation of zonal flows by Rossby wave turbulence Nonlinear excitation of zonal flows by Rossby wave turbulence

Jul 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009njph...11g3038m&link_type=abstract

New Journal of Physics, Volume 11, Issue 7, pp. 073038 (2009).

Physics

3

Scientific paper

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.

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