• Bougeault, P., and P. Lacarrère, 1989: Parameterization of orography-induced turbulence in a mesobeta-scale model. Mon. Wea. Rev, 117 , 18721890.

    • Search Google Scholar
    • Export Citation
  • Bretherton, C. S., and and Coauthors, 1999: An intercomparison of radiatively driven entrainment and turbulence in a smoke cloud, as simulated by different numerical models. Quart. J. Roy. Meteor. Soc, 125 , 391423.

    • Search Google Scholar
    • Export Citation
  • Cuijpers, J. W. M., and P. G. Duynkerke, 1993: Large eddy simulation of trade wind cumulus clouds. J. Atmos. Sci, 50 , 38943908.

  • Cuxart, J., P. Bougeault, and J-L. Redelsperger, 2000: A turbulence scheme allowing for mesoscale and large-eddy simulations. Quart. J. Roy. Meteor. Soc, 126 , 130.

    • Search Google Scholar
    • Export Citation
  • Fiedler, B. H., 1998: Continuous adaptation of a curvilinear grid. Numerical Methods in Fluid Mechanics, A. Vincent, Ed., CRM Proceedings and Lecture Notes, Vol. 16, American Mathematical Society, 99–107.

    • Search Google Scholar
    • Export Citation
  • Fiedler, B. H., and R. J. Trapp, 1993: A fast dynamic grid adaption scheme for meteorological flows. Mon. Wea. Rev, 121 , 28792888.

  • Lenderink, G., and A. A. M. Holtslag, 2000: Evaluation of the kinetic energy approach for modeling turbulent fluxes in stratocumulus. J. Atmos. Sci, 57 , 244258.

    • Search Google Scholar
    • Export Citation
  • Lenderink, G., M. C. vanZanten, and P. G. Duynkerke, 1999: Can El turbulence closure simulate entrainment in radiatively driven convective boundary layers? J. Atmos. Sci, 56 , 33313337.

    • Search Google Scholar
    • Export Citation
  • Moeng, C-H., 2000: Entrainment rate, cloud fraction, and liquid water path and PBL stratocumulus clouds. J. Atmos. Sci, 57 , 36273643.

    • Search Google Scholar
    • Export Citation
  • Tremback, C. J., J. Powell, W. R. Cotton, and R. A. Pielke, 1987: The forward-in-time upstream advection scheme: Extension to higher orders. Mon. Wea. Rev, 115 , 540554.

    • Search Google Scholar
    • Export Citation
All Time Past Year Past 30 Days
Abstract Views 0 0 0
Full Text Views 29 5 0
PDF Downloads 6 3 0

Grid Adaption and Its Effect on Entrainment in an El Model of the Atmospheric Boundary Layer

Brian H. FiedlerSchool of Meteorology, University of Oklahoma, Norman, Oklahoma

Search for other papers by Brian H. Fiedler in
Current site
Google Scholar
PubMed
Close
Restricted access

Abstract

A one-dimensional numerical model KOLUM is introduced that demonstrates the use of continuous dynamic grid adaption in modeling the atmospheric boundary layer. The entrainment rates of KOLUM are compared against recent calibrations for smoke clouds and water clouds derived from large-eddy simulations. The simulations performed with KOLUM support the claim that turbulent kinetic energy–diagnostic length scale (El) models overpredict entrainment by smoke and water clouds, independent of the use of grid adaption. The benefits of grid adaption are slight. Curiously, the simulations did not confirm spurious entrainment of El models in episodes of subsidence.

Corresponding author address: Dr. Brian Fiedler, School of Meteorology, EC 1310, 100 E. Boyd St., Norman, OK 73019. Email: bfiedler@ou.edu

Abstract

A one-dimensional numerical model KOLUM is introduced that demonstrates the use of continuous dynamic grid adaption in modeling the atmospheric boundary layer. The entrainment rates of KOLUM are compared against recent calibrations for smoke clouds and water clouds derived from large-eddy simulations. The simulations performed with KOLUM support the claim that turbulent kinetic energy–diagnostic length scale (El) models overpredict entrainment by smoke and water clouds, independent of the use of grid adaption. The benefits of grid adaption are slight. Curiously, the simulations did not confirm spurious entrainment of El models in episodes of subsidence.

Corresponding author address: Dr. Brian Fiedler, School of Meteorology, EC 1310, 100 E. Boyd St., Norman, OK 73019. Email: bfiedler@ou.edu

Save