Nonlinear excitation of zonal flows by Rossby wave turbulence
2009 (English)In: New Journal of Physics, ISSN 1367-2630, E-ISSN 1367-2630, Vol. 11, 073038Article in journal (Refereed) PublishedText
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
Fusion, Plasma and Space Physics
IdentifiersURN: urn:nbn:se:umu:diva-115985DOI: 10.1088/1367-2630/11/7/073038ISI: 000268324700002OAI: oai:DiVA.org:umu-115985DiVA: diva2:907121