DOI: 10.1029/2012JD018464
论文题名: Exploring parameterization for turbulent entrainment-mixing processes in clouds
作者: Lu C. ; Liu Y. ; Niu S. ; Krueger S. ; Wagner T.
刊名: Journal of Geophysical Research Atmospheres
ISSN: 21698996
出版年: 2013
卷: 118, 期: 1 起始页码: 185
结束页码: 194
语种: 英语
英文关键词: entrainment-mixing process
; homogeneous mixing degree
; model
; observations
; transition scale number
Scopus关键词: Models
; Parameterization
; Aircraft observations
; Atmospheric radiation measurements
; entrainment-mixing process
; Intensive observation periods
; Mixing degree
; observations
; Southern great plains
; transition scale number
; Mixing
; adiabatic process
; aircraft
; cloud microphysics
; entrainment
; in situ measurement
; mixing
; parameterization
; Great Plains
英文摘要: Different turbulent entrainment-mixing processes (e.g., homogeneous and inhomogeneous) occur in clouds; accurate representation of these processes is critical for improving cloud-related parameterizations in large-scale models, but poorly understood and quantified. Using in situ aircraft observations over the U. S. Department of Energy's Atmospheric Radiation Measurement Southern Great Plains site during the March 2000 Cloud Intensive Observation Period and numerical simulations with the Explicit Mixing Parcel Model (EMPM), here we explore the potential of using degree of homogeneous mixing as a measure to quantify these different mechanisms and examine various microphysical measures of homogeneous mixing degree and their relationships to entrainment-mixing dynamics as measured by transition scale numbers. Three different microphysical measures for the homogeneous mixing degree are newly defined and each is coupled with one of two different transition scale numbers. Both observations and simulations show that all the combinations have positive correlated relationships; simulations further show that the tightest relationship is between the measure of homogeneous mixing degree considering adiabatic number concentration and the transition scale number accounting for mixing fraction of dry air. A parameterization of the entrainment-mixing processes is advanced according to the relationships of homogeneous mixing degree measures to transition scale numbers. Three measures of homogeneous mixing degree are newly defined Relationship between homogeneous mixing degree and scale number is established A new parameterization of entrainment-mixing processes is advanced. © 2012 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/63966
Appears in Collections: 影响、适应和脆弱性 气候减缓与适应
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作者单位: CMA Key Laboratory for Aerosol-Cloud-Precipitation, Key Laboratory of Meteorological Disaster of Ministry of Education, Nanjing University of Information Science and Technology (NUIST), Ningliu Rd., Pukou, Nanjing, Jiangsu, China; Atmospheric Sciences Division, Brookhaven National Laboratory (BNL), Upton, NY, United States; Department of Meteorology, University of Utah, Salt Lake City, UT, United States; Department of Atmospheric Sciences, Creighton University, Omaha, NE, United States
Recommended Citation:
Lu C.,Liu Y.,Niu S.,et al. Exploring parameterization for turbulent entrainment-mixing processes in clouds[J]. Journal of Geophysical Research Atmospheres,2013-01-01,118(1)