DOI: 10.1175/JCLI-D-11-00197.1
Scopus记录号: 2-s2.0-84858256367
论文题名: The evolution of climate sensitivity and climate feedbacks in the community atmosphere model
作者: Gettelman A. ; Kay J.E. ; Shell K.M.
刊名: Journal of Climate
ISSN: 8948755
出版年: 2012
卷: 25, 期: 5 起始页码: 1453
结束页码: 1469
语种: 英语
Scopus关键词: Climate sensitivity
; Cloud forcing
; Community atmosphere model
; Lapse rate
; Midlatitudes
; Model experiments
; National center for atmospheric researches
; Parameterizations
; Physical parameterization
; Radiative forcings
; Shallow convection
; Slab ocean models
; Small area
; Storm track
; Surface albedo
; Tropical clouds
; Atmospheric radiation
; Cams
; Carbon dioxide
; Climate change
; Clouds
; Feedback
; Parameterization
; Tropics
; Climate models
; air temperature
; albedo
; atmospheric modeling
; climate change
; climate feedback
; climate modeling
; cloud radiative forcing
; parameterization
; sensitivity analysis
; storm track
; stratocumulus
; water vapor
英文摘要: The major evolution of the National Center for Atmospheric Research Community Atmosphere Model (CAM) is used to diagnose climate feedbacks, understand how climate feedbacks change with different physical parameterizations, and identify the processes and regions that determine climate sensitivity. In the evolution of CAM from version 4 to version 5, the water vapor, temperature, surface albedo, and lapse rate feedbacks are remarkably stable across changes to the physical parameterization suite. However, the climate sensitivity increases from 3.2 K in CAM4 to 4.0 K in CAM5. The difference is mostly due to (i) more positive cloud feedbacks and (ii) higher CO 2 radiative forcing in CAM5. The intermodel differences in cloud feedbacks are largest in the tropical trade cumulus regime and in the midlatitude storm tracks. The subtropical stratocumulus regions do not contribute strongly to climate feedbacks owing to their small area coverage. A "modified Cess" configuration for atmosphere-only model experiments is shown to reproduce slab ocean model results. Several parameterizations contribute to changes in tropical cloud feedbacks between CAM4 and CAM5, but the new shallow convection scheme causes the largest midlatitude feedback differences and the largest change in climate sensitivity. Simulations with greater cloud forcing in the mean state have lower climate sensitivity. This work provides a methodology for further analysis of climate sensitivity across models and a framework for targeted comparisons with observations that can help constrain climate sensitivity to radiative forcing. © 2012 American Meteorological Society. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/52524
Appears in Collections: 气候变化事实与影响
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作者单位: National Center for Atmospheric Research, Boulder, CO, United States; Oregon State University, Corvallis, OR, United States
Recommended Citation:
Gettelman A.,Kay J.E.,Shell K.M.. The evolution of climate sensitivity and climate feedbacks in the community atmosphere model[J]. Journal of Climate,2012-01-01,25(5)