Avalanches, breathers, and flow reversal in a continuous Lorenz-96 model

Blender, R.; Wouters, J.; Lucarini, V.

doi:10.1103/PhysRevE.88.013201

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Avalanches, breathers, and flow reversal in a continuous Lorenz-96 model

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Blender, R., Wouters, J., & Lucarini, V. (2013). Avalanches, breathers, and flow reversal in a continuous Lorenz-96 model. PHYSICAL REVIEW E, 88(1): 013201. doi:10.1103/PhysRevE.88.013201.

Cite as: https://hdl.handle.net/11858/00-001M-0000-0017-C36F-F

Abstract

For the discrete model suggested by Lorenz in 1996, a one-dimensional long-wave approximation with nonlinear excitation and diffusion is derived. The model is energy conserving but non-Hamiltonian. In a low-order truncation, weak external forcing of the zonal mean flow induces avalanchelike breather solutions which cause reversal of the mean flow by a wave-mean flow interaction. The mechanism is an outburst-recharge process similar to avalanches in a sandpile model.