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DOI | 10.1175/JAS-D-17-0326.1 |
A General Description of Entrainment in Buoyant Cloudy Plumes Including the Effects of Mixing-Induced Evaporation | |
Savre, Julien1; Herzog, Michael | |
2019-02-01 | |
发表期刊 | JOURNAL OF THE ATMOSPHERIC SCIENCES
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ISSN | 0022-4928 |
EISSN | 1520-0469 |
出版年 | 2019 |
卷号 | 76期号:2页码:479-496 |
文章类型 | Article |
语种 | 英语 |
国家 | England |
英文摘要 | In this work, the steady-state one-dimensional axisymmetric plume theory is revisited and generalized to include the effects of nonhomogeneous updraft velocity and buoyancy profiles across the plume, environmental shear, and, more importantly, evaporative cooling resulting from the mixing between cloudy air and the dry environment. Based on an energy consistency argument, a method is proposed to derive a relationship for the fractional lateral mixing rate (which may here be positive or negative) from the plume's integral equations, as well as a set of equations for the equivalent plume properties, both of which maintain a high degree of generality by incorporating effects of environmental shear and inhomogeneous radial distributions. In the absence of wind shear, a simpler entrainment-rate closure is proposed, which is then further constrained by systematically varying the plume and environmental conditions and allowing evaporative cooling to occur. The fractional mixing rate is shown to be strongly correlated with the plume buoyancy and, to a lesser extent, to the critical mixing fraction (i.e., the fraction of dry air that needs to be mixed with cloudy air to make the mixture neutrally buoyant). Quantitative estimates of this dependency are given to facilitate implementations of the new model in convection parameterizations. Analyzing the proposed closure suggests that it could capture features observed in recent high-resolution simulations and that it is consistent with the buoyancy-sorting concept. The results therefore support recent findings concerning the parameterization of entrainment for moist atmospheric convection. |
英文关键词 | Convective clouds Convective parameterization Parameterization |
领域 | 地球科学 |
收录类别 | SCI-E |
WOS记录号 | WOS:000457330100001 |
WOS关键词 | TURBULENT ENTRAINMENT ; VERTICAL VELOCITY ; DIURNAL CYCLE ; PART I ; MODEL ; PARAMETERIZATION ; DETRAINMENT ; CONVECTION ; JETS ; PRESSURE |
WOS类目 | Meteorology & Atmospheric Sciences |
WOS研究方向 | Meteorology & Atmospheric Sciences |
引用统计 | |
文献类型 | 期刊论文 |
条目标识符 | http://119.78.100.173/C666/handle/2XK7JSWQ/29264 |
专题 | 地球科学 |
作者单位 | 1.Univ Cambridge, Dept Geog, Cambridge, England; 2.Univ Cambridge, Ctr Atmospher Sci, Cambridge, England |
推荐引用方式 GB/T 7714 | Savre, Julien,Herzog, Michael. A General Description of Entrainment in Buoyant Cloudy Plumes Including the Effects of Mixing-Induced Evaporation[J]. JOURNAL OF THE ATMOSPHERIC SCIENCES,2019,76(2):479-496. |
APA | Savre, Julien,&Herzog, Michael.(2019).A General Description of Entrainment in Buoyant Cloudy Plumes Including the Effects of Mixing-Induced Evaporation.JOURNAL OF THE ATMOSPHERIC SCIENCES,76(2),479-496. |
MLA | Savre, Julien,et al."A General Description of Entrainment in Buoyant Cloudy Plumes Including the Effects of Mixing-Induced Evaporation".JOURNAL OF THE ATMOSPHERIC SCIENCES 76.2(2019):479-496. |
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