Global S&T Development Trend Analysis Platform of Resources and Environment
DOI | 10.1175/JAS-D-19-0224.1 |
Evaluation of the Bulk Mass Flux Formulation Using Large-Eddy Simulations | |
Jian-Feng Gu; Robert Stephen Plant; Christopher E. Holloway; Todd R. Jones; Alison Stirling; Peter A. Clark; Steven J. Woolnough; Thomas L. Webb | |
2020-05-27 | |
发表期刊 | Journal of the Atmospheric Sciences
![]() |
出版年 | 2020 |
英文摘要 | In this study, bulk mass flux formulations for turbulent fluxes are evaluated for shallow and deep convection using large-eddy simulation data. The bulk mass flux approximation neglects two sources of variability: the interobject variability due to differences between the average properties of different cloud objects, and the intraobject variability due to perturbations within each cloud object. Using a simple cloud–environment decomposition, the interobject and intraobject contributions to the heat flux are comparable in magnitude with that from the bulk mass flux approximation, but do not share a similar vertical distribution, and so cannot be parameterized with a rescaling method. A downgradient assumption is also not appropriate to parameterize the neglected flux contributions because a nonnegligible part is associated with nonlocal buoyant structures. A spectral analysis further suggests the presence of fine structures within the clouds. These points motivate investigations in which the vertical transports are decomposed based on the distribution of vertical velocity. As a result, a “core-cloak” conceptual model is proposed to improve the representation of total vertical fluxes, composed of a strong and a weak draft for both the updrafts and downdrafts. It is shown that the core-cloak representation can well capture the magnitude and vertical distribution of heat and moisture fluxes for both shallow and deep convection. |
领域 | 地球科学 ; 气候变化 |
URL | 查看原文 |
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/271676 |
专题 | 地球科学 气候变化 |
推荐引用方式 GB/T 7714 | Jian-Feng Gu,Robert Stephen Plant,Christopher E. Holloway,et al. Evaluation of the Bulk Mass Flux Formulation Using Large-Eddy Simulations[J]. Journal of the Atmospheric Sciences,2020. |
APA | Jian-Feng Gu.,Robert Stephen Plant.,Christopher E. Holloway.,Todd R. Jones.,Alison Stirling.,...&Thomas L. Webb.(2020).Evaluation of the Bulk Mass Flux Formulation Using Large-Eddy Simulations.Journal of the Atmospheric Sciences. |
MLA | Jian-Feng Gu,et al."Evaluation of the Bulk Mass Flux Formulation Using Large-Eddy Simulations".Journal of the Atmospheric Sciences (2020). |
条目包含的文件 | 条目无相关文件。 |
除非特别说明,本系统中所有内容都受版权保护,并保留所有权利。
修改评论