DOI: 10.1002/2017JD027507
Scopus记录号: 2-s2.0-85042078513
论文题名: Investigation of Turbulent Entrainment-Mixing Processes With a New Particle-Resolved Direct Numerical Simulation Model
作者: Gao Z. ; Liu Y. ; Li X. ; Lu C.
刊名: Journal of Geophysical Research: Atmospheres
ISSN: 2169897X
出版年: 2018
卷: 123, 期: 4 起始页码: 2194
结束页码: 2214
语种: 英语
英文关键词: cloud microphysics
; direct numerical simulation
; entrainment-mixing process
; numerical method
; parameterization
; turbulence
Scopus关键词: cloud microphysics
; entrainment
; Eulerian analysis
; numerical method
; numerical model
; parameterization
; simulation
; three-dimensional modeling
; turbulent mixing
英文摘要: A new particle-resolved three-dimensional direct numerical simulation model is developed that combines Lagrangian droplet tracking with the Eulerian field representation of turbulence near the Kolmogorov microscale. Six numerical experiments are performed to investigate the processes of entrainment of clear air and subsequent mixing with cloudy air and their interactions with cloud microphysics. The experiments are designed to represent different combinations of three configurations of initial cloudy area and two turbulence modes (decaying and forced turbulence). Five existing measures of microphysical homogeneous mixing degree are examined, modified, and compared in terms of their ability as a unifying measure to represent the effect of various entrainment-mixing mechanisms on cloud microphysics. Also examined and compared are the conventional Damköhler number and transition scale number as a dynamical measure of different mixing mechanisms. Relationships between the various microphysical measures and dynamical measures are investigated to search for a unified parameterization of entrainment-mixing processes. The results show that even with the same cloud water fraction, the thermodynamic and microphysical properties are different, especially for the decaying cases. Further analysis confirms that despite the detailed differences in cloud properties among the six simulation scenarios, the variety of turbulent entrainment-mixing mechanisms can be reasonably represented with power law relationships between the microphysical homogeneous mixing degrees and the dynamical measures. ©2018. American Geophysical Union. All Rights Reserved. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/114432
Appears in Collections: 气候减缓与适应
There are no files associated with this item.
作者单位: Department of Applied Mathematics and Statistics, State University of New York at Stony Brook, Stony Brook, NY, United States; Brookhaven National Laboratory, Upton, NY, United States; Key Laboratory for Aerosol-Cloud-Precipitation of China Meteorological Administration, Nanjing University of Information Science and Technology, Nanjing, China
Recommended Citation:
Gao Z.,Liu Y.,Li X.,et al. Investigation of Turbulent Entrainment-Mixing Processes With a New Particle-Resolved Direct Numerical Simulation Model[J]. Journal of Geophysical Research: Atmospheres,2018-01-01,123(4)