globalchange  > 气候变化事实与影响
DOI: 10.1175/JCLI-D-12-00555.1
Scopus记录号: 2-s2.0-84879994254
论文题名:
Contributions of different cloud types to feedbacks and rapid adjustments in CMIP5
作者: Zelinka M.D.; Klein S.A.; Taylor K.E.; Andrews T.; Webb M.J.; Gregory J.M.; Forster P.M.
刊名: Journal of Climate
ISSN: 8948755
出版年: 2013
卷: 26, 期:14
起始页码: 5007
结束页码: 5027
语种: 英语
Scopus关键词: Climate model simulations ; Cloud feedbacks ; Cloud properties ; Cloud top pressure ; Long-wave radiation ; Rapid reduction ; Short-wave radiation ; Simultaneous model ; Carbon dioxide ; Climate models ; Computer simulation ; Feedback ; albedo ; climate modeling ; cloud cover ; cloud microphysics ; cloud radiative forcing ; feedback mechanism ; optical depth
英文摘要: Using five climate model simulations of the response to an abrupt quadrupling of CO2, the authors perform the first simultaneous model intercomparison of cloud feedbacks and rapid radiative adjustments with cloud masking effects removed, partitioned among changes in cloud types and gross cloud properties. Upon CO2 quadrupling, clouds exhibit a rapid reduction in fractional coverage, cloud-top pressure, and optical depth, with each contributing equally to a 1.1 W m22 net cloud radiative adjustment, primarily from shortwave radiation. Rapid reductions in midlevel clouds and optically thick clouds are important in reducing planetary albedo in every model. As the planet warms, clouds become fewer, higher, and thicker, and global mean net cloud feedback is positive in all but onemodel and results primarily fromincreased trapping of longwave radiation. As was true for earliermodels, high cloud changes are the largest contributor to intermodel spread in longwave and shortwave cloud feedbacks, but low cloud changes are the largest contributor to the mean and spread in net cloud feedback. The importance of the negative optical depth feedback relative to the amount feedback at high latitudes is even more marked than in earlier models. The authors show that the negative longwave cloud adjustment inferred in previous studies is primarily caused by a 1.3 W m22 cloud masking of CO2 forcing. Properly accounting for cloudmasking increases net cloud feedback by 0.3 W m22 K21,whereas accounting for rapid adjustments reduces by 0.14 W m22 K21 the ensemble mean net cloud feedback through a combination of smaller positive cloud amount and altitude feedbacks and larger negative optical depth feedbacks. ©2013 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/51810
Appears in Collections:气候变化事实与影响

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作者单位: Program for Climate Model Diagnosis and Intercomparison, Lawrence Livermore National Laboratory, Livermore, CA, United States; Met Office Hadley Center, Exeter, United Kingdom; National Centre for Atmospheric Science, University of Reading, Reading, United Kingdom; University of Leeds, Leeds, United Kingdom

Recommended Citation:
Zelinka M.D.,Klein S.A.,Taylor K.E.,et al. Contributions of different cloud types to feedbacks and rapid adjustments in CMIP5[J]. Journal of Climate,2013-01-01,26(14)
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