DOI: 10.1175/JCLI-D-18-0339.1
Scopus记录号: 2-s2.0-85059652051
论文题名: A robust constraint on the temperature and height of the extratropical tropopause
作者: Thompson D.W.J. ; Ceppi P. ; Li Y.
刊名: Journal of Climate
ISSN: 8948755
出版年: 2019
卷: 32, 期: 2 起始页码: 273
结束页码: 287
语种: 英语
英文关键词: Atmospheric circulation
; Climate change
; Large-scale motions
; Tropopause
Scopus关键词: Climate change
; Clouds
; Global warming
; Locks (fasteners)
; Mixing
; Surface properties
; Water vapor
; Atmospheric circulation
; Clausius Clapeyron relation
; Extratropical tropopause
; General circulation model
; Large scale motion
; Saturation vapor pressure
; Tropopause
; Water vapor concentration
; Atmospheric temperature
; air temperature
; atmospheric circulation
; climate change
; computer simulation
; global warming
; numerical model
; saturation
; tropopause
; water vapor
英文摘要: In a recent study, the authors hypothesize that the Clausius-Clapeyron relation provides a strong constraint on the temperature of the extratropical tropopause and hence the depth of mixing by extratropical eddies. The hypothesis is a generalization of the fixed-anvil temperature hypothesis to the global atmospheric circulation. It posits that the depth of robust mixing by extratropical eddies is limited by radiative cooling by water vapor-and hence saturation vapor pressures-in areas of sinking motion. The hypothesis implies that 1) radiative cooling by water vapor constrains the vertical structure and amplitude of extratropical dynamics and 2) the extratropical tropopause should remain at roughly the same temperature and lift under global warming. Here the authors test the hypothesis in numerical simulations run on an aquaplanet general circulation model (GCM) and a coupled atmosphere-ocean GCM (AOGCM). The extratropical cloud-top height, wave driving, and lapse-rate tropopause all shift upward but remain at roughly the same temperature when the aquaplanetGCMis forced by uniform surface warming of14K and when theAOGCMis forced by RCP8.5 scenario emissions. ''Locking'' simulations run on the aquaplanetGCMfurther reveal that 1) holding the water vapor concentrations input into the radiation code fixed while increasing surface temperatures strongly constrains the rise in the extratropical tropopause,whereas 2) increasing the water vapor concentrations input into the radiation code while holding surface temperatures fixed leads to robust rises in the extratropical tropopause. Together, the results suggest that roughly invariant extratropical tropopause temperatures constitutes an additional ''robust response'' of the climate system to global warming. © 2018 American Meteorological Society. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/117240
Appears in Collections: 气候变化与战略
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Recommended Citation:
Thompson D.W.J.,Ceppi P.,Li Y.. A robust constraint on the temperature and height of the extratropical tropopause[J]. Journal of Climate,2019-01-01,32(2)