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Turbulent mixing at an inversion layer

Published online by Cambridge University Press:  26 April 2006

M. J. A. M. Perera ,
H. J. S. Fernando  and
D. L. Boyer
M. J. A. M. Perera
Affiliation:
Program in Environmental Fluid Dynamics, Department of Mechanical and Aerospace Engineering, Arizona State University, Tempe, AZ 85287–6106, USA
H. J. S. Fernando
Affiliation:
Program in Environmental Fluid Dynamics, Department of Mechanical and Aerospace Engineering, Arizona State University, Tempe, AZ 85287–6106, USA
D. L. Boyer
Affiliation:
Program in Environmental Fluid Dynamics, Department of Mechanical and Aerospace Engineering, Arizona State University, Tempe, AZ 85287–6106, USA
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Abstract

A series of laboratory experiments was carried out to examine the interaction between stratification and turbulence at an inversion layer, with the objective of gaining insight into certain wave–turbulence encounters in the atmosphere. A three-layer stratified fluid system, consisting of a (thick) strongly stratified inversion layer, sandwiched between an upper turbulent layer and a lower non-turbulent weakly stratified layer, was employed. Oscillating-grid-induced shear-free turbulence was used in the upper layer. During the experiments, a fourth (interfacial) layer developed in the region between the inversion and the turbulent layer, and most of the wave–turbulence interactions were confined to this layer. Detailed measurements of the vertical velocity structure, internal-wave parameters and mixing characteristics were made in the stratified layers and, whenever possible, the results were compared to available theoretical predictions.

Type
Research Article
Information
Journal of Fluid Mechanics , Volume 267 , 25 May 1994 , pp. 275 - 298
Copyright
© 1994 Cambridge University Press

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References

Carruthers, D. J. & Hunt, J. C. R. 1986 Velocity fluctuations near an interface between a turbulent region and a stably stratified layer. J. Fluid Mech. 165, 475–501 (referred to herein as CH1).Google Scholar
Carruthers, D. J. & Hunt, J. C. R. 1994 Waves, turbulence and entrainment near an inversion layer. J. Fluid Mech. (submitted). (Referred to herein as CH2).Google Scholar
Carruthers, D. J., Hunt, J. C. R. & Turfus, C. J. 1986 Turbulent flow near density inversion layers. In Direct and Large Eddy Simulation of Turbulence (ed. U. Schumann & R. Friedrich), pp. 271–290. Vieweg and Son.
Carruthers, D. J. & Moeng, C.-H. 1987 Waves on the overlying inversion of the convective boundary layer. J. Atmos. Sci. 44, 1801–1808.Google Scholar
Caughey, S. J., Crease, B. A. & Roach, W. T. 1982 A field study of nocturnal Stratocumulus II. Q. J. R. Met. Soc. 198, 124–144.Google Scholar
Caughey, S. J. & Kitchen, M. 1984 Some measurements of the turbulent and microphysical structure of nocturnal stratocumulus clouds. Q. J. R. Met. Soc. 110, 13–34.Google Scholar
Caughey, S. J. & Palmer, S. G. 1979 Some aspects of turbulence through the depth of the convective boundary layer. Q. J. R. Met. Soc. 105, 811–827.Google Scholar
Crapper, D. F. & Linden, P. F. 1974 The structure of turbulent density interface. J. Fluid Mech. 65, 45–63.Google Scholar
Deardorff, J. W. 1980 Stratocumulus models derived from a three dimensional model. Boundary-Layer Met. 18, 495–527.Google Scholar
Deardorff, J. W., Willis, G. E. & Stockton, B. H. 1980 Laboratory studies of the entrainment zone of a convective mixed-layer. J. Fluid Mech. 100, 41–64.Google Scholar
DeSilva, I. P. D. & Fernando, H. J. S. 1992 Some aspects of mixing in a stratified turbulent patch. J. Fluid Mech. 240, 601–625.Google Scholar
DeSilva, I. P. D., Montenegro, L & Fernando, H. J. S. 1990 Measurements of the interfacial distortions at a stratified entrainment interface. Exp. Fluids 9, 13–31.Google Scholar
E, X. & Hopfinger, E. J. 1986 On mixing across an interface in stably stratified fluid. J. Fluid Mech. 166, 227–244.Google Scholar
Fernando, H. J. S. 1991 Turbulent mixing in stratified fluids. Ann. Rev. Fluid Mech. 23, 455–493.Google Scholar
Fernando, H. J. S. & Hunt, J. C. R. 1994 Modelling of turbulent mixing at shear-free density interfaces. (Submitted for publication).
Fernando, H. J. S. & Long, R. R. 1983 The growth of a grid-generated mixed layer in a two fluid system. J. Fluid Mech. 133, 377–395.Google Scholar
Fleury, M., Mory, M., Hopfinger, E. J. & Auchere, D. 1990 Effects of rotation on turbulent mixing across a density interface. J. Fluid Mech. 223, 165–191.Google Scholar
Gossard, E. E., Chadwick, R. B., Neff, W. D. & Moran, K. P. 1982 The use of ground based Doppler-radar to measure gradients, fluxes and structure parameters in elevated layer. J. Appl. Met. 2, 211–226.Google Scholar
Grisogono, B. & Keislar, R. E. 1992 Radiative stabilization of nocturnal stable atmospheric boundary layer over the desert. Boundary-Layer Met. 61, 1–12.Google Scholar
Hannoun, I. A., Fernando, H. J. S. & List, E. J. 1988 Turbulence structure near a sharp density interface. J. Fluid Mech. 189, 189–209.Google Scholar
Hannoun, I. A. & List, E. J. 1988 Turbulent mixing at a shear free density interface. J. Fluid Mech. 189, 211–234.Google Scholar
Heidt, F. D. 1977 The growth of the mixed layer in a stratified fluid due to penetrative convection. Boundary-Layer Met. 12, 439–461.Google Scholar
Hopfinger, E. J. & Linden, P. F. 1982 Formation of a thermocline in zero-mean-shear turbulence subjected to a stabilizing buoyancy flux. J. Fluid Mech. 114, 157–173.Google Scholar
Hopfinger, E. J. & Toly, J.-A. 1976 Spatially decaying turbulence and its relation to mixing across density interfaces. J. Fluid Mech. 78, 155–175.Google Scholar
Kaimal, J. C., Wyngaard, J. C., Haugen, D. A., Cote, O. R., Izumi, Y., Caughey, S. J. & Readings, C. J. 1976 Turbulence structure in the convective boundary layer. J. Atmos. Sci. 33, 2153–2169.Google Scholar
Linden, P. F. 1973 The interaction of vortex rings with a sharp density interface: a model for turbulent entrainment. J. Fluid Mech. 60, 467–480.Google Scholar
Long, R. R. 1978 A theory of mixing in a stably stratified fluid. J. Fluid Mech. 84, 113–124.Google Scholar
McEwan, A. D. 1983 The kinematics of stratified mixing through internal wave breaking. J. Fluid Mech. 128, 47–58.Google Scholar
Moffat, H. K. 1984 Simple topological aspects of turbulent vorticity dynamics. In Proc. IUTAM Symp. on Turbulence and Chaotic Phenomena in Fluids (ed. T. Tatsumi). Elsevier.
Moum, J. M., Caldwell, D. R. & Paulson, C. A. 1989 Mixing in the equatorial surface layer and thermocline. J. Geophys. Res. 94 (C2), 2005–2021.Google Scholar
Noh, Y. & Fernando, H. J. S. 1993 The role of molecular diffusion in the deepening of the mixed layer. Dyn. Atmos. Oceans 17, 187–215.Google Scholar
Oster, G. & Yamamoto, M. 1963 Density gradient techniques. Chem. Rev. 63, 257–268.Google Scholar
Scott, J. C. & Kerry, J. J. 1985 Internal waves in the bay of Biscay. Internal Report, ARE Portland.
Tennekes, H. 1975 Eularian and Lagrangian time microscales in isotropic turbulence. J. Fluid Mech. 67, 561–567.Google Scholar
Thompson, S. M. & Turner, J. S. 1975 Mixing across an interface due to turbulence generated by an oscillating grid. J. Fluid Mech. 67, 349–368.Google Scholar
Townsend, A. A. 1976 The Structure of Turbulent Shear Flow, pp. 232–247. Cambridge University Press.
Turner, J. S. 1991 Convection and mixing in the oceans and the earth. Phys. Fluids 3, 1218–1232.Google Scholar