| THERMODYNAMIC PROPERTIES AND ROLE OF THERMALS IN THE STRATUS-TOPPED BOUNDARY LAYER |
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| 作者姓名： | 申绍华 周明煜 |
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| 作者单位： | National Research Center for Marine Environmental Forecasts Beijing 100081，National Research Center for Marine Environmental Forecasts，Beijing 100081 |
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| 基金项目： | This work is partly supported by the National Natural Science Foundation of China(approval number of item:49236110). |
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| 摘 要： | From results of two large-eddy simulation of stratus-topped boundary layer,the structure,thermodynamic prop-erties and role of thermals are investigated by using conditional sampling methods,which divided the thermals into thewarm/moist,cool/dry,warm/dry and cool/moist events.The results show that the main turbulent circulation in thestratus-topped boundary layer is composed of the warm/moist updraft and cool/dry downdraft.Below entrainmentregion,the warm/moist updrafts and cool/dry downdrafts are,respectively,positively and negatively buoyant andcontribute most to total fluxes and variances.Evaporative cooling has important effect on the structure and thermodynamic properties of thermals instratus-topped boundary layer.
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THERMODYNAMIC PROPERTIES AND ROLE OF THERMALS IN THE STRATUS-TOPPED BOUNDARY LAYER |
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| Shen Shaohua Zhou Mingyu National Research Center for Marine Environmental Forecasts,Beijing.THERMODYNAMIC PROPERTIES AND ROLE OF THERMALS IN THE STRATUS-TOPPED BOUNDARY LAYER[J].Acta Meteorologica Sinica,1994(3). |
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| Authors: | Shen Shaohua Zhou Mingyu National Research Center for Marine Environmental Forecasts Beijing |
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| Affiliation: | Shen Shaohua Zhou Mingyu National Research Center for Marine Environmental Forecasts,Beijing 100081 |
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| Abstract: | From results of two large-eddy simulation of stratus-topped boundary layer,the structure,thermodynamic prop- erties and role of thermals are investigated by using conditional sampling methods,which divided the thermals into the warm/moist,cool/dry,warm/dry and cool/moist events.The results show that the main turbulent circulation in the stratus-topped boundary layer is composed of the warm/moist updraft and cool/dry downdraft.Below entrainment region,the warm/moist updrafts and cool/dry downdrafts are,respectively,positively and negatively buoyant and contribute most to total fluxes and variances. Evaporative cooling has important effect on the structure and thermodynamic properties of thermals in stratus-topped boundary layer. |
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| Keywords: | thermals stratus-topped boundary layer thermodynamic properties large-eddy simulation entrainment |
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