Noise rectification in quasigeostrophic forced turbulence

Details Noise rectification in quasigeostrophic forced turbulence Noise rectification in quasigeostrophic forced turbulence

1998-02-04

arxiv.org/abs/chao-dyn/9802003v2

Phys. Rev. E 58, 7279 (1998)

Physics

Condensed Matter

Statistical Mechanics

4 pages revtex, including 5 figures. Related material at http://www.imedea.uib.es/Nonlinear and http://www.imedea.uib.es/Ocean

Scientific paper

10.1103/PhysRevE.58.7279

We study the appearance of large scale mean motion sustained by stochastic forcing on a rotating fluid (in the quasigeostrophic approximation) flowing over topography. As in other noise rectification phenomena, the effect requires nonlinearity and absence of detailed balance to occur. By application of an analytical coarse graining procedure we identify the physical mechanism producing such effect: It is a forcing coming from the small scales that manifests in a change in the effective viscosity operator and in the effective noise statistical properties.

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