DOI: 10.1002/2015MS000489
Scopus记录号: 2-s2.0-84950291715
论文题名: Large-eddy simulation of the transient and near-equilibrium behavior of precipitating shallow convection
作者: Seifert A ; , Heus T ; , Pincus R ; , Stevens B
刊名: Journal of Advances in Modeling Earth Systems
ISSN: 19422466
出版年: 2015
卷: 7, 期: 4 起始页码: 1918
结束页码: 1937
语种: 英语
英文关键词: Aerosols
; Clouds
; Commerce
; Drops
; Aerosol indirect effect
; Cloud droplet number
; Cloud droplet number concentrations
; Cloud radiative effects
; Equilibrium behavior
; Radiative-convective equilibrium
; Shallow convection
; Vertical distributions
; Large eddy simulation
; aerosol
; albedo
; atmospheric convection
; cloud cover
; cloud droplet
; cloud radiative forcing
; eddy covariance
; evaporation
; precipitation (climatology)
; relative humidity
; sensitivity analysis
; water vapor
英文摘要: Large-eddy simulation is used to study the sensitivity of trade wind cumulus clouds to perturbations in cloud droplet number concentrations. We find that the trade wind cumulus system approaches a radiative-convective equilibrium state, modified by net warming and drying from imposed large-scale advective forcing. The system requires several days to reach equilibrium when cooling rates are specified but much less time, and with less sensitivity to cloud droplet number density, when radiation depends realistically on the vertical distribution of water vapor. The transient behavior and the properties of the near-equilibrium cloud field depend on the microphysical state and therefore on the cloud droplet number density, here taken as a proxy for the ambient aerosol. The primary response of the cloud field to changes in the cloud droplet number density is deepening of the cloud layer. This deepening leads to a decrease in relative humidity and a faster evaporation of small clouds and cloud remnants constituting a negative lifetime effect. In the near-equilibrium regime, the decrease in cloud cover compensates much of the Twomey effect, i.e., the brightening of the clouds, and the overall aerosol effect on the albedo of the organized precipitating cumulus cloud field is small. © 2015. The Authors. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/75958
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: Hans-Ertel Centre for Weather Research, Deutscher Wetterdienst, Hamburg, Germany; Department of Physics, Cleveland State University, Cleveland, OH, United States; University of Colorado, And NOAA/Earth System Research Laboratory, Boulder, CO, United States; Max Planck Institute for Meteorology, Hamburg, Germany
Recommended Citation:
Seifert A,, Heus T,, Pincus R,et al. Large-eddy simulation of the transient and near-equilibrium behavior of precipitating shallow convection[J]. Journal of Advances in Modeling Earth Systems,2015-01-01,7(4)