| DOI: | 10.1175/JCLI-D-15-0394.1
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| Scopus记录号: | 2-s2.0-84957804102
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| 论文题名: | Clouds and the atmospheric circulation response to warming |
| 作者: | Ceppi P.; Hartmann D.L.
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| 刊名: | Journal of Climate
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| ISSN: | 8948755
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| 出版年: | 2016
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| 卷: | 29, 期:2 | | 起始页码: | 783
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| 结束页码: | 799
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| 语种: | 英语
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| Scopus关键词: | Atmospheric structure
; Carbon dioxide
; Climate change
; Climatology
; Expansion
; Feedback
; Greenhouse gases
; Jets
; Locks (fasteners)
; Meteorology
; Storms
; Troposphere
; Atmospheric circulation
; Cloud forcing
; General circulation model
; Greenhouse-gas forcing
; Polar amplifications
; Storm track
; Tropospheric circulation
; Vertical temperature distribution
; Climate models
; atmospheric circulation
; carbon dioxide
; climate change
; climate feedback
; climatology
; cloud radiative forcing
; general circulation model
; global warming
; greenhouse gas
; jet
; storm track
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| 英文摘要: | The authors study the effect of clouds on the atmospheric circulation response to CO2 quadrupling in an aquaplanet model with a slab ocean lower boundary. The cloud effect is isolated by locking the clouds to either the control or 4xCO2 state in the shortwave (SW) or longwave (LW) radiation schemes. In the model, cloud radiative changes explain more than half of the total poleward expansion of the Hadley cells, midlatitude jets, and storm tracks under CO2 quadrupling, even though they cause only one-fourth of the total global-mean surface warming. The effect of clouds on circulation results mainly from the SW cloud radiative changes, which strongly enhance the equator-to-pole temperature gradient at all levels in the troposphere, favoring stronger and poleward-shifted midlatitude eddies. By contrast, quadrupling CO2 while holding the clouds fixed causes strong polar amplification and weakened midlatitude baroclinicity at lower levels, yielding only a small poleward expansion of the circulation. The results show that 1) the atmospheric circulation responds sensitively to cloud-driven changes in meridional and vertical temperature distribution and 2) the spatial structure of cloud feedbacks likely plays a dominant role in the circulation response to greenhouse gas forcing. While the magnitude and spatial structure of the cloud feedback are expected to be highly model dependent, an analysis of 4xCO2 simulations of CMIP5 models shows that the SW cloud feedback likely forces a poleward expansion of the tropospheric circulation in most climate models. © 2016 American Meteorological Society. |
| 资助项目: | NSF, National Science Foundation
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| Citation statistics: |
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| 资源类型: | 期刊论文
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| 标识符: | http://119.78.100.158/handle/2HF3EXSE/50170
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| Appears in Collections: | 气候变化事实与影响
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作者单位: | Department of Atmospheric Sciences, University of Washington, Seattle, WA, United States
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| Recommended Citation: | |
Ceppi P.,Hartmann D.L.. Clouds and the atmospheric circulation response to warming[J]. Journal of Climate,2016-01-01,29(2)
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