DOI: 10.1002/2015GL065529
论文题名: Evaporative cooling amplification of the entrainment velocity in radiatively driven stratocumulus
作者: De Lozar A. ; Mellado J.P.
刊名: Geophysical Research Letters
ISSN: 0094-9200
EISSN: 1944-8931
出版年: 2015
卷: 42, 期: 17 起始页码: 7223
结束页码: 7229
语种: 英语
英文关键词: entrainment
; stratocumulus
; turbulence
Scopus关键词: Air entrainment
; Clouds
; Efficiency
; Evaporation
; Evaporative cooling systems
; Turbulence
; Velocity
; Cloud-top mixing
; Entrainment velocities
; Evaporative cooling
; Inversion point
; Parametrizations
; Single parameter
; Stratocumulus
; Thermodynamical properties
; Cooling
; cooling
; entrainment
; evaporation
; evaporite
; parameterization
; stratocumulus
; thermodynamics
; turbulence
英文摘要: Evaporative cooling monotonically increases as the thermodynamical properties of the inversion allow for more evaporation in shear-free radiatively driven stratocumulus. However, the entrainment velocity can deviate from the evaporative cooling trend and even become insensitive to variations in the inversion properties. Here the efficiency of evaporative cooling at amplifying the entrainment velocity is quantified by means of direct numerical simulations of a cloud top mixing layer. We demonstrate that variations in the efficiency modulate the effect of evaporative cooling on entrainment, explaining the different trends. These variations are associated with the evaporation of droplets in cloud holes below the inversion point. The parametrization of the efficiency provides the evaporative amplification of the entrainment velocity as a function of a single parameter that characterizes the inversion. The resulting entrainment velocities match our experiments and previous measurements to within ±25%. The parametrization also predicts the transition to a broken-cloud field consistently with observations. ©2015. American Geophysical Union. All Rights Reserved. URL: https://www.scopus.com/inward/record.uri?eid=2-s2.0-84943356777&doi=10.1002%2f2015GL065529&partnerID=40&md5=1177eda6ab292381009f7e8f3493c3c2
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/8816
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: Max Planck Institute for Meteorology, Hamburg, Germany
Recommended Citation:
De Lozar A.,Mellado J.P.. Evaporative cooling amplification of the entrainment velocity in radiatively driven stratocumulus[J]. Geophysical Research Letters,2015-01-01,42(17).