The kH-3 and kH-5/3 energy spectra in stratified turbulence

Details The kH-3 and kH-5/3 energy spectra in stratified turbulence The kH-3 and kH-5/3 energy spectra in stratified turbulence

Mar 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006georl..3305809k&link_type=abstract

Geophysical Research Letters, Volume 33, Issue 5, CiteID L05809

Physics

Geophysics

13

Mathematical Geophysics: Numerical Approximations And Analysis (4260), Mathematical Geophysics: Spectral Analysis (3205, 3280), Nonlinear Geophysics: Cascades, Nonlinear Geophysics: Turbulence (3379, 4568, 7863)

Scientific paper

Numerical experiments of stratified turbulence are conducted with a high-resolution nonhydrostatic Boussinesq model to investigate the energy spectrum produced by synoptic scale forcings. The spectral slope obtained in our experiment with planetary rotation is close to -3 in the synoptic scales and -5/3 in the mesoscales, as observed in the troposphere. While the vortical modes are predominant in the -3 spectral range, magnitude of the divergent modes is greater than that of the vortical ones in the -5/3 range. The downscale energy cascade associated with the divergent modes plays an important role in the formation of the mesoscale kH-5/3 spectrum. In experiments without planetary rotation, the obtained spectral slope is steeper and energy transfer to larger vertical wavenumbers is increased.

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