Accessibility navigation


The cumulus-capped boundary layer. I: Modelling transports in the cloud layer

Grant, A. L. M. (2006) The cumulus-capped boundary layer. I: Modelling transports in the cloud layer. Quarterly Journal of the Royal Meteorological Society, 132 (618). pp. 1385-1403. ISSN 1477-870X

Full text not archived in this repository.

Abstract/Summary

Scalar-flux budgets have been obtained from large-eddy simulations (LESs) of the cumulus-capped boundary layer. Parametrizations of the terms in the budgets are discussed, and two parametrizations for the transport term in the cloud layer are proposed. It is shown that these lead to two models for scalar transports by shallow cumulus convection. One is equivalent to the subsidence detrainment form of convective tendencies obtained from mass-flux parametrizations of cumulus convection. The second is a flux-gradient relationship that is similar in form to the non-local parametrizations of turbulent transports in the dry-convective boundary layer. Using the fluxes of liquid-water potential temperature and total water content from the LES, it is shown that both models are reasonable diagnostic relations between fluxes and the vertical gradients of the mean fields. The LESs used in this study are for steady-state convection and it is possible to treat the fluxes of conserved thermodynamic variables as independent, and ignore the effects of condensation. It is argued that a parametrization of cumulus transports in a model of the cumulus-capped boundary layer should also include an explicit representation of condensation. A simple parametrization of the liquid-water flux in terms of conserved variables is also derived.

Item Type:Article
Divisions:Faculty of Science > School of Mathematical and Physical Sciences > Department of Meteorology
ID Code:5221
Uncontrolled Keywords:cloudy boundary layer cumulus parametrization large-eddy simulation FLUX CONVECTION SCHEME TRADE-WIND CUMULI PART I EDDY-DIFFUSIVITY SINGLE-COLUMN PARAMETERIZATION PARAMETRIZATION REPRESENTATION SIMULATIONS TESTS
Additional Information:Part A
Publisher:Royal Meteorological Society

University Staff: Request a correction | Centaur Editors: Update this record

Page navigation