DOI: 10.1175/JCLI-D-18-0417.1
Scopus记录号: 2-s2.0-85060553113
论文题名: Thermodynamic control on the poleward shift of the extratropical jet in climate change simulations: The role of rising high clouds and their radiative effects
作者: Li Y. ; Thompson D.W.J. ; Bony S. ; Merl T.M.
刊名: Journal of Climate
ISSN: 8948755
出版年: 2019
卷: 32, 期: 3 起始页码: 917
结束页码: 934
语种: 英语
英文关键词: Atmospheric circulation
; Climate change
; Clouds
; General circulation models
; Jets
; Radiative forcing
Scopus关键词: Atmospheric radiation
; Climate change
; Clouds
; Global warming
; Jets
; Thermodynamics
; Atmospheric circulation
; Clausius Clapeyron relation
; Climate change simulations
; Cloud radiative effects
; General circulation model
; Radiative forcings
; Thermodynamic constraints
; Water vapor concentration
; Climate models
英文摘要: Extratropical eddy-driven jets are predicted to shift poleward in a warmer climate. Recent studies have suggested that cloud radiative effects (CRE) may enhance the amplitude of such shifts. But there is still considerable uncertainty about the underlying mechanisms, whereby CRE govern the jet response to climate change. This study provides new insights into the role of CRE in the jet response to climate change by exploiting the output from six global warming simulations run with and without atmospheric CRE (ACRE). Consistent with previous studies, it is found that the magnitude of the jet shift under climate change is substantially increased in simulations run with ACRE. It is hypothesized that ACRE enhance the jet response to climate change by increasing the upper-tropospheric baroclinicity due to the radiative effects of rising high clouds. The lifting of the tropopause and high clouds in response to surface warming arises from the thermodynamic constraints placed on water vapor concentrations. Hence, the influence of ACRE on the jet shift in climate change simulations may be viewed as an additional "robust" thermodynamic constraint placed on climate change by the Clausius-Clapeyron relation. The hypothesis is tested in simulations run with an idealized dry GCM, in which the model is perturbed with a thermal forcing that resembles the ACRE response to surface warming. It is demonstrated that 1) the enhanced jet shifts found in climate change simulations run with ACRE are consistent with the atmospheric response to the radiative warming associated with rising high clouds, and 2) the amplitude of the jet shift scales linearly with the amplitude of the ACRE forcing. © 2019 American Meteorological Society.
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/117224
Appears in Collections: 气候变化与战略
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Recommended Citation:
Li Y.,Thompson D.W.J.,Bony S.,et al. Thermodynamic control on the poleward shift of the extratropical jet in climate change simulations: The role of rising high clouds and their radiative effects[J]. Journal of Climate,2019-01-01,32(3)