DOI: 10.1016/j.atmosres.2018.01.015
Scopus记录号: 2-s2.0-85044368451
论文题名: The impact of boundary layer turbulence on snow growth and precipitation: Idealized Large Eddy Simulations
作者: Chu X. ; Xue L. ; Geerts B. ; Kosović B.
刊名: Atmospheric Research
ISSN: 1698095
出版年: 2018
卷: 204 起始页码: 54
结束页码: 66
语种: 英语
英文关键词: Large Eddy Simulation
; Large-eddy turbulence
; Mixed-phase cloud
; Snow growth
Scopus关键词: Atmospheric thermodynamics
; Boundary layers
; Heat flux
; Snow
; Turbulence
; Boundary layer turbulence
; Large eddy
; Mixed-phase cloud
; Planetary boundary layers
; Radiative heat exchange
; Saturation vapor pressure
; Supercooled droplets
; Surface precipitation
; Large eddy simulation
英文摘要: Ice particles and supercooled droplets often co-exist in planetary boundary-layer (PBL) clouds. The question examined in this numerical study is how large turbulent PBL eddies affect snow growth and surface precipitation from mixed-phase PBL clouds. In order to simplify this question, this study assumes an idealized BL with well-developed turbulence but no surface heat fluxes or radiative heat exchanges. Large Eddy Simulations with and without resolved PBL turbulence are compared. This comparison demonstrates that the impact on snow growth in mixed-phase clouds is controlled by two opposing mechanisms, a microphysical and a dynamical one. The cloud microphysical impact of large turbulent eddies is based on the difference in saturation vapor pressure over water and over ice. The net outcome of alternating turbulent up- and downdrafts is snow growth by diffusion and/or accretion (riming). On the other hand, turbulence-induced entrainment and detrainment may suppress snow growth. In the case presented herein, the net effect of these microphysical and dynamical processes is positive, but in general the net effect depends on ambient conditions, in particular the profiles of temperature, humidity, and wind. © 2017 Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/108925
Appears in Collections: 影响、适应和脆弱性 气候变化事实与影响
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作者单位: Department of Atmospheric Science, University of Wyoming, Laramie, Wyoming 82071, United States; Research Applications Laboratory, National Center for Atmospheric Research, Boulder, CO 80307, United States
Recommended Citation:
Chu X.,Xue L.,Geerts B.,et al. The impact of boundary layer turbulence on snow growth and precipitation: Idealized Large Eddy Simulations[J]. Atmospheric Research,2018-01-01,204