globalchange  > 影响、适应和脆弱性
DOI: 10.1002/2013MS000250
Scopus记录号: 2-s2.0-84899096387
论文题名:
Low cloud reduction in a greenhouse-warmed climate: Results from Lagrangian les of a subtropical marine cloudiness transition
作者: Bretherton C; S; , Blossey P; N
刊名: Journal of Advances in Modeling Earth Systems
ISSN: 19422466
出版年: 2014
卷: 6, 期:1
起始页码: 91
结束页码: 114
语种: 英语
英文关键词: Atmospheric thermodynamics ; Atmospheric turbulence ; Boundary layers ; Carbon dioxide ; Lagrange multipliers ; Large eddy simulation ; Liquids ; Tropics ; Cloud feedbacks ; Cloud radiative effects ; Free troposphere ; Pacific ocean ; Radiative mechanisms ; Stratocumulus clouds ; Surface warming ; Thermodynamic mechanism ; Clouds ; boundary layer ; climate forcing ; cloud cover ; cloud radiative forcing ; greenhouse effect ; Lagrangian analysis ; large eddy simulation ; stratocumulus ; subtropical region ; thermodynamics ; troposphere ; Pacific Ocean ; Pacific Ocean (Northeast)
英文摘要: Lagrangian large-eddy simulations of a composite stratocumulus to cumulus transition case over the subtropical northeast Pacific Ocean are subject to perturbed forcings that isolate the cloud response to CO2, to overall tropical warming, and to increased inversion stability over the subtropical subsidence regions. These simulations show that a tropical surface warming of 4 K induces substantial stratocumulus thinning via a thermodynamic mechanism: increased cloud layer humidity flux in a warmer climate induces an entrainment liquid-flux adjustment that dries the stratocumulus cloud layer, whether well mixed or cumulus coupled. A radiative mechanism amplifies this response: increased emissivity of the free troposphere due to increased CO2 and water vapor reduces radiative driving of turbulence in a stratocumulus-capped boundary layer; a thinner stratocumulus layer accompanies less turbulence. In combination, a 4 K warming and CO2 quadrupling greatly reduce low cloud and weaken the simulated shortwave cloud radiative effect by over 50%. Large increases in inversion stability in the stratocumulus regions could counter much of this cloudiness reduction. Key Points LES isolates radiative and thermodynamic positive low cloud feedback mechanisms Thermodynamic cloud thinning due to entrainment liquid-flux adjustment ELF thinning mechanism affects all subtropical Sc-topped cloud regimes © 2014. American Geophysical Union. All Rights Reserved.
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/76092
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 Atmospheric Sciences, University of Washington, Seattle WA, United States

Recommended Citation:
Bretherton C,S,, Blossey P,et al. Low cloud reduction in a greenhouse-warmed climate: Results from Lagrangian les of a subtropical marine cloudiness transition[J]. Journal of Advances in Modeling Earth Systems,2014-01-01,6(1)
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