| DOI: | 10.1175/JCLI-D-13-00738.1
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| Scopus记录号: | 2-s2.0-84902089848
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| 论文题名: | Resolved snowball earth clouds |
| 作者: | Abbot D.S.
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| 刊名: | Journal of Climate
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| ISSN: | 8948755
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| 出版年: | 2014
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| 卷: | 27, 期:12 | | 起始页码: | 4391
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| 结束页码: | 4402
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| 语种: | 英语
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| Scopus关键词: | Atmospheric radiation
; Carbon dioxide
; Climate models
; Cloud microphysics
; Cloud radiative forcing
; Cloud resolving model
; General circulation model simulations
; Geochemical data
; Snowball Earth
; Stratocumulus clouds
; Tropical convection
; Earth (planet)
; albedo
; cloud microphysics
; cloud radiative forcing
; convective cloud
; deglaciation
; general circulation model
; longwave radiation
; stratocumulus
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| 英文摘要: | Recent general circulation model (GCM) simulations have challenged the idea that a snowball Earth would be nearly entirely cloudless. This is important because clouds would provide a strong warming to a highalbedo snowball Earth. GCM results suggest that clouds could lower the threshold CO2 needed to deglaciate a snowball by a factor of 10-100, enough to allow consistency with geochemical data. Here a cloud-resolving model is used to investigate cloud and convection behavior in a snowball Earth climate. The model produces convection that extends vertically to a similar temperature as modern tropical convection. This convection produces clouds that resemble stratocumulus clouds under an inversion on modern Earth, which slowly dissipate by sedimentation of cloud ice. There is enough cloud ice for the clouds to be optically thick in the longwave, and the resulting cloud radiative forcing is similar to that produced in GCMs run in snowball conditions. This result is robust to large changes in the cloud microphysics scheme because the cloud longwave forcing, which dominates the total forcing, is relatively insensitive to cloud amount and particle size. The cloud-resolving model results are therefore consistent with the idea that clouds would provide a large warming to a snowball Earth, helping to allow snowball deglaciation. © 2014 American Meteorological Society. |
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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/51026
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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 the Geophysical Sciences, University of Chicago, 5734 S. Ellis Ave., Chicago, IL 60637, United States
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| Recommended Citation: | |
Abbot D.S.. Resolved snowball earth clouds[J]. Journal of Climate,2014-01-01,27(12)
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