Statistics
Scientific paper
Mar 2008
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008georl..3506809b&link_type=abstract
Geophysical Research Letters, Volume 35, Issue 6, CiteID L06809
Statistics
Atmospheric Processes: Turbulence (4490), Atmospheric Composition And Structure: Middle Atmosphere: Constituent Transport And Chemistry (3334), Atmospheric Processes: Middle Atmosphere Dynamics (0341, 0342)
Scientific paper
Statistics of a passive scalar (or tracer) with a horizontal mean gradient in randomly forced and strongly stratified turbulence are investigated by numerical simulations. We observe that horizontal isotropy of the passive scalar spectrum is satisfied in the inertial range. The spectrum has the form E $\theta$ (k h ) = C $\theta$ $\varepsilon$ $\theta$ $\varepsilon$ K -1/3 k h -5/3, where $\varepsilon$ $\theta$ , $\varepsilon$ K are the dissipation of scalar variance and kinetic energy respectively, and C $\theta$ $\simeq$ 0.5 is a constant. This spectrum is consistent with atmospheric measurements in the mesoscale range with wavelengths 1-500 km. We also calculate the fourth-order passive scalar structure function and show that intermittency effects are present in stratified turbulence.
Brethouwer Geert
Lindborg Erik
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