Physics
Scientific paper
Sep 2000
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000georl..27.2621a&link_type=abstract
Geophysical Research Letters, Volume 27, Issue 17, p. 2621-2624
Physics
9
Atmospheric Composition And Structure: Middle Atmosphere-Constituent Transport And Chemistry, Meteorology And Atmospheric Dynamics: Turbulence, Oceanography: Physical: Turbulence, Diffusion, And Mixing Processes
Scientific paper
In the stratosphere, turbulence is confined within shallow, localized patches. The resulting vertical mixing of tracers is highly intermittent and difficult to quantify. Here a new technique is employed to estimate from high-resolution, lower stratospheric mid-latitude balloon data a well-defined vertical diffusivity associated with this mixing. The technique, which is based on a stochastic model of the distribution of turbulent patches, emphasises the dependence of the diffusivity on the typical patch lifetime. Assuming a lifetime of a few hours, the diffusivity is found to be in the range 0.01-0.02m2s-1. This value is an order of magnitude smaller than those previously derived from radar measurements. The potential of the technique for the analysis of ocean microstructure measurements is noted.
Alisse Jean-Rémi
Haynes Peter H.
Sidi Claude
Vanneste Jacques
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