Avalanches, breathers, and flow reversal in a continuous Lorenz-96 model.
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.
Meteorologisches Institut, KlimaCampus, Universität Hamburg, Hamburg, Germany.
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R
Blender
J
J
Wouters
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V
Lucarini