A Thermal Plume Model for the Convective Boundary Layer : Representation of Cumulus Clouds
The “thermal plume model,” a mass-flux scheme combined with a classical diffusive approach, originally developed to represent turbulent transport in the dry convective boundary layer, is extended here to the representation of cloud processes. The modified parameterization is validated in a 1D config...
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| Veröffentlicht in: | Journal of the atmospheric sciences 2008-02, Vol.65 (2), p.407-425 |
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| container_end_page | 425 |
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| container_title | Journal of the atmospheric sciences |
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| creator | RIO, Catherine HOURDIN, Frederic |
| description | The “thermal plume model,” a mass-flux scheme combined with a classical diffusive approach, originally developed to represent turbulent transport in the dry convective boundary layer, is extended here to the representation of cloud processes. The modified parameterization is validated in a 1D configuration against results of large eddy simulations (LES), as well as in a 3D configuration against in situ measurements, for a series of cases of dry and cloudy convective boundary layers. Accounting for coherent structures of the mixed layer with the mass-flux scheme improves the representation of the diurnal cycle of the boundary layer, particularly its progressive deepening during the day and the associated near-surface drying. Results also underline the role of the prescription of the mixing of air between the plume and its environment, and of submean-plume fluctuations. |
| doi_str_mv | 10.1175/2007jas2256.1 |
| format | Article |
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| source | American Meteorological Society; EZB-FREE-00999 freely available EZB journals; Alma/SFX Local Collection |
| subjects | Boundary layers Clouds Earth, ocean, space Exact sciences and technology External geophysics General circulation models Heated water In situ measurement Meteorology Physics of the high neutral atmosphere Thermal plumes Turbulence |
| title | A Thermal Plume Model for the Convective Boundary Layer : Representation of Cumulus Clouds |
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