Physics
Scientific paper
Dec 2008
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008georl..3523604h&link_type=abstract
Geophysical Research Letters, Volume 35, Issue 23, CiteID L23604
Physics
3
Oceanography: Physical: Turbulence, Diffusion, And Mixing Processes (4490), Oceanography: General: Analytical Modeling And Laboratory Experiments, Oceanography: Physical: General Or Miscellaneous, Atmospheric Processes: Turbulence (4490)
Scientific paper
Results are reported of measurements of the turbulent Schmidt number Sct in a stably stratified water tunnel experiment. Sct values varied with two parameters: Richardson number, Ri, and ratio of time scales, T*, of eddy turnover and eddy advection from the source of turbulence generation. For large values (T* ~ 10) values of Sct approach those of neutral stratification (Sct ~ 1). In contrast for small values (T* ~ 1) values of Sct increase with Ri. The variation of Sct with T* explains the large scatter of Sct values observed in atmospheric and oceanic data sets as a range of values of T* occur at any given Ri. The dependence of Sct values on advective processes upstream of the measurement location complicates the development of an algebraic formulation of Sct = f (Ri, T*) from single point dynamical balances for use in turbulence closure models. Observations of values of T* ~ O(1) for strong stratification argues against the existence of a critical Richardson number at which turbulence collapses to laminar flow.
Huq Pablo
Stewart Edward J.
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