DOI: 10.1002/2014MS000380
Scopus记录号: 2-s2.0-84968594613
论文题名: An les model study of the influence of the free tropospheric thermodynamic conditions on the stratocumulus response to a climate perturbation
作者: Van Der Dussen J ; J ; , De Roode S ; R ; , Gesso S ; D ; , Siebesma A ; P
刊名: Journal of Advances in Modeling Earth Systems
ISSN: 19422466
出版年: 2015
卷: 7, 期: 2 起始页码: 670
结束页码: 691
语种: 英语
英文关键词: Atmospheric humidity
; Atmospheric thermodynamics
; Boundary layers
; Climate change
; Clouds
; Global warming
; Heat flux
; Humidity control
; Large eddy simulation
; Surface waters
; Troposphere
; Turbulence
; Climate response
; Short-wave radiation
; Steady state
; stratocumulus
; Stratocumulus clouds
; Stratocumulus-topped marine boundary layers
; Thermodynamic conditions
; Tropospheric humidity
; Climate models
; boundary layer
; climate change
; cloud radiative forcing
; cooling
; entrainment
; global warming
; instability
; large eddy simulation
; relative humidity
; sea surface
; shortwave radiation
; steady-state equilibrium
; stratocumulus
; temperature profile
; thermodynamics
; troposphere
; turbulence
英文摘要: Twenty-five large-eddy simulations are performed to study how free tropospheric thermodynamic conditions control equilibrium state solutions of stratocumulus-topped marine boundary layers. In particular, we systematically vary the lower tropospheric stability (LTS) and a similar measure for the bulk humidity difference between the 700 hPa level and the surface, ΔQ. For all simulations, a completely overcast boundary layer is obtained in which the turbulence is mainly driven by cloud top radiative cooling. The steady state liquid water path (LWP) is rather insensitive to the LTS, but increases significantly and almost linearly with the free tropospheric humidity. In a second suite of runs, the response of the stratocumulus layer to an idealized global warming scenario is assessed by applying a uniform warming of 2 K to the initial temperature profile including the sea surface while the initial relative humidity profile is kept identical to the control case. The warming of the sea surface acts to increase the latent heat flux, which invigorates turbulence in the boundary layer. The steady state inversion height therefore increases, despite the competing effect of a more humid free troposphere that increases the downwelling radiative flux and hence tends to decrease the entrainment rate. The stratocumulus layer nevertheless thins for all free tropospheric conditions as cloud base rises more than cloud top. This implies a positive stratocumulus cloud-climate feedback for this scenario as thinner clouds reflect less shortwave radiation back to space. The cloud thinning response to the climate perturbation is found to be mostly controlled by the change of ΔQ. © 2015. The Authors. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/76054
Appears in Collections: 影响、适应和脆弱性 气候变化与战略
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作者单位: Department of Geoscience and Remote Sensing, Delft University of Technology, Delft, Netherlands; Royal Netherlands Meteorological Institute, De Bilt, Netherlands
Recommended Citation:
Van Der Dussen J,J,, De Roode S,et al. An les model study of the influence of the free tropospheric thermodynamic conditions on the stratocumulus response to a climate perturbation[J]. Journal of Advances in Modeling Earth Systems,2015-01-01,7(2)