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On the Stratification of Turbulent Mixed Layers

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  • The vertical distribution of density or temperature is studied in turbulent boundary layers stratified by either salt or temperature and driven in an annulus by a rotating screen. With rapidly growing boundary layers the buoyancy flux due to entrainment becomes sufficiently large that the boundary layer is no longer well mixed. Stratification in the boundary layer is largest near the entrainment interface, corresponding to extension of the density transition into the turbulent boundary layer. The stratification in the rest of the boundary layer is smaller and nearly independent of height. The mean boundary layer stratification and structure and integral properties of the density distribution are found to be strongly dependent on the ratio of the entrainment rate to the turbulent velocity scale.
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  • Mahrt, L., and J.-C. André (1983), On the Stratification of Turbulent Mixed Layers, Journal of Geophysical Research, 88(C4), 2662–2666, doi:10.1029/JC088iC04p02662.
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  • 88
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  • C4
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  • This material is based upon work supported by the National Science Foundation under Grants ATM 7908308 and ATM 8109778 and Direction de la M6t6orologie, Paris. J. C. Andr6 performed this work while on leave from the latter organization.
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