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Modulational instability of Rossby and drift waves and generation of zonal jets

Published online by Cambridge University Press:  05 May 2010

COLM P. CONNAUGHTON ,
BALASUBRAMANYA T. NADIGA ,
SERGEY V. NAZARENKO  and
BRENDA E. QUINN
COLM P. CONNAUGHTON*
Affiliation:
Centre for Complexity Science, University of Warwick, Gibbet Hill Road, Coventry CV4 7AL, UK Mathematics Institute, University of Warwick, Gibbet Hill Road, Coventry CV4 7AL, UK
BALASUBRAMANYA T. NADIGA
Affiliation:
Los Alamos National Laboratory, Los Alamos, NM 87545, USA
SERGEY V. NAZARENKO
Affiliation:
Mathematics Institute, University of Warwick, Gibbet Hill Road, Coventry CV4 7AL, UK
BRENDA E. QUINN
Affiliation:
Mathematics Institute, University of Warwick, Gibbet Hill Road, Coventry CV4 7AL, UK
*
†Email address for correspondence: connaughtonc@gmail.com
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Abstract

We study the modulational instability of geophysical Rossby and plasma drift waves within the Charney–Hasegawa–Mima (CHM) model both theoretically, using truncated (four-mode and three-mode) models, and numerically, using direct simulations of CHM equation in the Fourier space. We review the linear theory of Gill (Geophys. Fluid Dyn., vol. 6, 1974, p. 29) and extend it to show that for strong primary waves the most unstable modes are perpendicular to the primary wave, which correspond to generation of a zonal flow if the primary wave is purely meridional. For weak waves, the maximum growth occurs for off-zonal inclined modulations that are close to being in three-wave resonance with the primary wave. Our numerical simulations confirm the theoretical predictions of the linear theory as well as the nonlinear jet pinching predicted by Manin & Nazarenko (Phys. Fluids, vol. 6, 1994, p. 1158). We find that, for strong primary waves, these narrow zonal jets further roll up into Kármán-like vortex streets, and at this moment the truncated models fail. For weak primary waves, the growth of the unstable mode reverses and the system oscillates between a dominant jet and a dominate primary wave, so that the truncated description holds for longer. The two-dimensional vortex streets appear to be more stable than purely one-dimensional zonal jets, and their zonal-averaged speed can reach amplitudes much stronger than is allowed by the Rayleigh–Kuo instability criterion for the one-dimensional case. In the long term, the system transitions to turbulence helped by the vortex-pairing instability (for strong waves) and the resonant wave–wave interactions (for weak waves).

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Papers
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Journal of Fluid Mechanics , Volume 654 , 10 July 2010 , pp. 207 - 231
Copyright
Copyright © Cambridge University Press 2010

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