Inverse cascades in rotating stratified turbulence: Fast growth of large scales

AMS Citation:
Marino, R., P. D. Mininni, D. L. Rosenberg, and A. Pouquet, 2013: Inverse cascades in rotating stratified turbulence: Fast growth of large scales. Europhysics Letters, 102, doi:10.1209/0295-5075/102/44006.
Date:2013-05-01
Resource Type:article
Title:Inverse cascades in rotating stratified turbulence: Fast growth of large scales
Abstract: We examine the inverse cascade of kinetic energy to large scales in rotating stratified turbulence as occurs in the oceans and in the atmosphere, while varying the relative frequency of gravity to inertial waves, N/f. Using direct numerical simulations with grid resolutions up to 10243 points, we find that the transfer of energy from three-dimensional to two-dimensional modes is most efficient in the range 1/2 - N/f - 2, in which resonances disappear. In this range, the cascade is faster than in the purely rotating case, and thus the interplay between rotation and stratification helps creating large-scale structures. The ensuing inverse cascade follows a -5/3 spectral law with an approximately constant flux. This inverse cascade becomes negligible when stratification is dominant.
Peer Review:Refereed
Copyright Information:Copyright 2013 IOP Publishing Ltd.
OpenSky citable URL: ark:/85065/d7st7qq9
Publisher's Version: 10.1209/0295-5075/102/44006
Author(s):
  • Raffaele Marino - NCAR/UCAR
  • Pablo Mininni - NCAR/UCAR
  • Duane Rosenberg - NCAR/UCAR
  • Annick Pouquet - NCAR/UCAR
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