DOI: 10.1175/JCLI-D-17-0087.1
Scopus记录号: 2-s2.0-85040608943
论文题名: The dependence of global cloud and lapse rate feedbacks on the spatial structure of tropical pacific warming
作者: Andrews T. ; Webb M.J.
刊名: Journal of Climate
ISSN: 8948755
出版年: 2018
卷: 31, 期: 2 起始页码: 641
结束页码: 654
语种: 英语
英文关键词: Climate change
; Climate sensitivity
; Clouds
; Energy budget/balance
; Feedback
Scopus关键词: Atmospheric structure
; Atmospheric temperature
; Budget control
; Climate models
; Clouds
; Earth atmosphere
; Feedback
; Oceanography
; Sensitivity analysis
; Surface properties
; Surface waters
; Tropics
; Troposphere
; Atmospheric general circulation models
; Atmospheric stability
; Climate change simulations
; Climate sensitivity
; Energy budget/balance
; Multi-decadal time scale
; Sea surface temperature (SST)
; Sensitivity changes
; Climate change
; climate change
; climate feedback
; climatology
; cloud cover
; energy balance
; general circulation model
; sea surface temperature
; warming
; Pacific Ocean
; Pacific Ocean (Tropical)
英文摘要: An atmospheric general circulation model (AGCM) is forced with patterns of observed sea surface temperature (SST) change and those output from atmosphere-ocean GCM (AOGCM) climate change simulations to demonstrate a strong dependence of climate feedback on the spatial structure of surface temperature change. Cloud and lapse rate feedbacks are found to vary the most, depending strongly on the pattern of tropical Pacific SST change. When warming is focused in the southeast tropical Pacific-a region of climatological subsidence and extensive marine low cloud cover-warming reduces the lower-tropospheric stability (LTS) and low cloud cover but is largely trapped under an inversion and hence has little remote effect. The net result is a relatively weak negative lapse rate feedback and a large positive cloud feedback. In contrast, when warming is weak in the southeast tropical Pacific and enhanced in the west tropical Pacific-a strong convective region-warming is efficiently transported throughout the free troposphere. The increased atmospheric stability results in a strong negative lapse rate feedback and increases the LTS in low cloud regions, resulting in a low cloud feedback of weak magnitude. These mechanisms help explain why climate feedback and sensitivity change on multidecadal time scales in AOGCM abrupt4xCO2 simulations and are different from those seen in AGCM experiments forced with observed historical SST changes. From the physical understanding developed here, one should expect unusually negative radiative feedbacks and low effective climate sensitivities to be diagnosed from real-world variations in radiative fluxes and temperature over decades in which the eastern Pacific has lacked 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/111705
Appears in Collections: 气候减缓与适应
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作者单位: Met Office Hadley Centre, Exeter, United Kingdom
Recommended Citation:
Andrews T.,Webb M.J.. The dependence of global cloud and lapse rate feedbacks on the spatial structure of tropical pacific warming[J]. Journal of Climate,2018-01-01,31(2)