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Noise-induced flow in quasigeostrophic turbulence with bottom friction

A. Alvarez, E. Hernandez-Garcia, J. Tintore

chao-dynarXiv:chao-dyn/9905022

Abstract

Randomly-forced fluid flow in the presence of scale-unselective dissipation develops mean currents following topographic contours. Known mechanisms based on the scale-selective action of damping processes are not at work in this situation. Coarse-graining reveals that the phenomenon is a kind of noise-rectification mechanism, in which lack of detailed balance and the symmetry-breaking provided by topography play an important role.

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