DOI: 10.1007/s00382-011-1279-7
Scopus记录号: 2-s2.0-84876877680
论文题名: Interpretation of the positive low-cloud feedback predicted by a climate model under global warming
作者: Brient F. ; Bony S.
刊名: Climate Dynamics
ISSN: 9307575
出版年: 2013
卷: 40, 期: 2017-09-10 起始页码: 2415
结束页码: 2431
语种: 英语
英文关键词: Climate change
; Hierarchy of models
; Low-level cloud feedbacks
; Moist static energy budget
英文摘要: The response of low-level clouds to climate change has been identified as a major contributor to the uncertainty in climate sensitivity estimates among climate models. By analyzing the behaviour of low-level clouds in a hierarchy of models (coupled ocean-atmosphere model, atmospheric general circulation model, aqua-planet model, single-column model) using the same physical parameterizations, this study proposes an interpretation of the strong positive low-cloud feedback predicted by the IPSL-CM5A climate model under climate change. In a warmer climate, the model predicts an enhanced clear-sky radiative cooling, stronger surface turbulent fluxes, a deepening and a drying of the planetary boundary layer, and a decrease of tropical low-clouds in regimes of weak subsidence. We show that the decrease of low-level clouds critically depends on the change in the vertical advection of moist static energy from the free troposphere to the boundary-layer. This change is dominated by variations in the vertical gradient of moist static energy between the surface and the free troposphere just above the boundary-layer. In a warmer climate, the thermodynamical relationship of Clausius-Clapeyron increases this vertical gradient, and then the import by large-scale subsidence of low moist static energy and dry air into the boundary layer. This results in a decrease of the low-level cloudiness and in a weakening of the radiative cooling of the boundary layer by low-level clouds. The energetic framework proposed in this study might help to interpret inter-model differences in low-cloud feedbacks under climate change. © 2012 The Author(s). Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/54992
Appears in Collections: 过去全球变化的重建
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作者单位: Laboratoire de Météorologie Dynamique (LMD/IPSL), Université Pierre et Marie Curie, CNRS, 4 Place Jussieu, Mailbox 99, 75252 Paris cedex 05, France
Recommended Citation:
Brient F.,Bony S.. Interpretation of the positive low-cloud feedback predicted by a climate model under global warming[J]. Climate Dynamics,2013-01-01,40(2017-09-10)