Abstract
Results of a large-eddy simulation of a decaying convective mixed layer over land are presented. The time evolution of the mixed layer is forced by the surface heat flux gradually decreasing with time. The results obtained show that the decay of the turbulent kinetic energy is governed by two scales, the external time scale controlling the surface heat flux changes, and the convective time scale. During the simulation, large eddies persist even when the heat flux at the surface becomes negative. A decoupled residual layer of active turbulence is developed above the stable surface layer. The residual layer is marked by large-scale updrafts that are able to penetrate the capping inversion layer and induce entrainment.
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Andrè, J. C., De Moor, G., Lacarrere, P., Theory, G., and Du Vachat, R.: 1978, 'Modeling the 24-Hour Evolution of the Mean and Turbulent Structures of the Planetary Boundary Layer’, J. Atmos. Sci. 35, 1861–1883.
Ball, F. K.: 1960. 'Control of the Inversion Height by Surface Heating’, Quart. J. Roy. Meteorol. Soc. 86, 483–494.
Betts, A. K.: 1973, 'Non-Precipitrating Cumulus Convection and its Parameterization’, Quart. J. Roy. Meteorol. Soc. 99, 178–196.
Deardorff, J. W.: 1970a, 'Preliminary Results from Numerical Integration of the Unstable Planetary Boundary Layers’, J. Atmos. Sci. 27, 1209–1211.
Deardorff, J. W.: 1970b, 'Convective Velocity and Temperature Scales for Unstable Planetary Bound-ary Layer and for Rayleigh Convection’, J. Atmos. Sci. 29, 1211–1212
Deardorff, J. W.: 1974a: 'Three-Dimensional Numerical Study of the Height and Mean Structure of a Heated Planetary Boundary Layer’, Boundary-Layer Meteorol. 7, 81–106.
Deardorff, J. W.: 1974b, 'Three-Dimensional Numerical Study of Turbulence in an Entraining Mixed Layer’, Boundary-Layer Meteorol. 7, 199–226.
Deardorff, J. W.: 1976, 'On the Entrainment Rate of a Stratocumulus-Topped Mixed Layer’, Quart. J. Roy. Meteorol. Soc. 102, 563–582.
Deardorff, J. W.: 1979, 'Prediction of Convective Mixed-Layer Entrainment for Realistic Capping Inversion Structure’, J. Atmos. Sci. 36, 424–436.
Kaimal, J. C., Wyngaard, J. C., Haugen, D. A., Cotè, O. R., Izumi, Y., Caughey, S. F., and Readings, C. J.: 1976, 'Turbulence Structure in the Convective Boundary Layer’, J. Atmos. Sci. 33, 2152–2169.
Lilly, D. K.: 1968, 'Models of Cloud-Capped Mixed Layers under a Strong Inversion’, Quart. J. Roy. Meteor. Soc. 94, 292–309.
Mahrt, L.: 1979, 'Penetrative Convection at the Top of a Growing Boundary Layer’, Quart. J. Roy. Meteorol. Soc. 105, 969–985.
Mason, P.J.: 1989, Large-Eddy Simulation of the Convective Atmospheric Boundary Layer’, J. Atmos. Sci. 46, 1492–1516.
Moeng, C.-H.: 1984, 'A Large-Eddy Simulation Model for the Study of Planetary Boundary-Layer Turbulence’, J. Atmos. Sci. 41, 2052–3169.
Nieuwstadt, F. T. M. and Brost, R. A.: 1986, 'The Decay of Convective Turbulence’, J. Atmos. Sci. 43, 532–546.
Nieuwstadt, F. T. M., Mason, P. J., Moeng, C. H., and Schumann, U.: 1992, 'Large-Eddy Simulation of Convective Boundary-Layer: A Comparison of Four Computer Codes’, in F. Durst et al.(eds.), Turbulent Shear Flows8, Springer-Verlag, pp. 343–367.
Schemm, C. E. and Lipps, F. B.: 1976, 'Some Results froma Simplified Three-Dimensional Numerical Model of Atmospheric Turbulence’, J. Atmos. Sci. 33, 1021–1041.
Schmidt, H. and Schumann, U.: 1989, 'Coherent Structure of the Convective Boundary Layer Derived from Large-Eddy Simulation’, J. Fluid Mech. 200, 511–562.
Schumann, U.: 1991a, 'Subgrid Length-Scales for Large-Eddy Simulation of Stratified Turbulence’, Theory Comput. Fluid Dyn. 2, 279–290.
Schumann, U.: 1991b, 'Simulations and Parameterizations of Large Eddies in Convective Atmospher-ic Boundary Layers’, Workshop on Fine Scale Modelling and the Development of Parameteriza-tion Schemes, European Centre for Medium-Range Weather Forecasts, pp. 21–51.
Sommeria, G.: 1976, 'Three-Dimensional Simulation of Turbulent Processes in an Undisturbed Trade Wind Boundary Layer’, J. Atmos. Sci. 33, 216–241.
Sorbjan, Z.: 1996a, 'Numerical Study of Penetrative and "Solid-Lid" Non-Penetrative Convective Boundary Layers’, J. Atmos. Sci. 53, 101–112
Sorbjan, Z.: 1996b, 'Effects Caused by Varying the Strength of the Capping Inversion Based on a Large Eddy Simulation Model of the Shear-Free Convective Boundary Layer’, J. Atmos. Sci. 53, 101–112
Sun, W.-Y., and Ogura, Y.: 1980, 'Modeling the Evolution of the Convective Planetary Boundary Layer’, J. Atmos. Sci. 37, 1558–1572.
Sun W.-Y.: 1993, 'Numerical Simulation of a Planetary Boundary Layer: Part I: Cloud-Free Case’, Beitr. Phys. Atmos. 66, 3–16.
Tennekes, H.: 1973, 'A Model for the Dynamics of the Inversion Above a Convective Boundary Layer’, J. Atmos. Sci. 30, 558–567.
Wyngaard J. C. and Brost, R. A.: 1984, 'Top-Down and Bottom-Up Diffusion in the Convective Boundary Layer’, J. Atmos. Sci. 41, 102–112.
Yamada, T. and Mellor, G.: 1975, 'A Simulation of the Wangara Atmospheric Boundary Layer Data’, J. Atmos. Sci. 32, 2309–2338.
Yamada, T.: 1979, 'Prediction of the Nocturnal Surface Inversion Height’, J. Atmos. Sci. 18, 526–531.
Zeman, O. and Tennekes, H.: 1977, 'Parameterization of the Turbulent Energy Budget at the Top of the Daytime Atmospheric Boundary Layer’, J. Atmos. Sci. 34, 111–123.
Zeman, O. and Lumiey, J. L.: 1976, 'Modeling Buoyancy Driven Mixed Layers’, J. Atmos. Sci. 33, 1974–1988.
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Sorbjan, Z. DECAY OF CONVECTIVE TURBULENCE REVISITED. Boundary-Layer Meteorology 82, 503–517 (1997). https://doi.org/10.1023/A:1000231524314
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DOI: https://doi.org/10.1023/A:1000231524314