DOI: 10.1002/2016GL069005
论文题名: Dependence of entrainment in shallow cumulus convection on vertical velocity and distance to cloud edge
作者: Tian Y. ; Kuang Z.
刊名: Geophysical Research Letters
ISSN: 0094-9096
EISSN: 1944-8827
出版年: 2016
卷: 43, 期: 8 起始页码: 4056
结束页码: 4065
语种: 英语
英文关键词: cloud-resolving model
; entrainment
; Lagrangian particle dispersion model
; shallow cumulus convection
Scopus关键词: Air entrainment
; Buoyancy
; Clouds
; Lagrange multipliers
; Velocity
; Cloud resolving model
; Entrainment rates
; Environmental conditions
; Lagrangian particle dispersion model
; Shallow cumulus convection
; Temperature perturbations
; Vertical gradients
; Vertical velocity
; Large eddy simulation
; amplitude
; buoyancy
; cloud cover
; convection
; environmental conditions
; large eddy simulation
; numerical model
; relative humidity
; stratification
; temperature effect
; velocity profile
英文摘要: The dependence of entrainment rate on environmental conditions and cloud characteristics is investigated using large eddy simulations (LES) of the response of shallow cumulus convection to a small-amplitude temperature perturbation that is horizontally uniform and localized in height. The simulated cumulus fields are analyzed in the framework of an ensemble of entraining plumes by tracking a large number of Lagrangian parcels embedded in the LES and grouping them into different plumes based on their detrainment heights. The results show that fractional entrainment rate per unit height of a plume is inversely proportional to the plume's vertical velocity and its distance to the cloud edge, while changes in environmental stratification and relative humidity, the plume's buoyancy, or the vertical gradient of its buoyancy due to the temperature perturbation have little effect on the plume's entrainment rate. ©2016. American Geophysical Union. All Rights Reserved. URL: https://www.scopus.com/inward/record.uri?eid=2-s2.0-84968913743&doi=10.1002%2f2016GL069005&partnerID=40&md5=babe11bd8bffb34050bd8e20b1897425
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/10059
Appears in Collections: 科学计划与规划 气候变化与战略
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作者单位: Department of Earth and Planetary Sciences, Harvard University, Cambridge, MA, United States
Recommended Citation:
Tian Y.,Kuang Z.. Dependence of entrainment in shallow cumulus convection on vertical velocity and distance to cloud edge[J]. Geophysical Research Letters,2016-01-01,43(8).