DOI: 10.1175/JCLI-D-15-0031.1
Scopus记录号: 2-s2.0-84950138463
论文题名: Reexamining the relationship between climate sensitivity and the Southern Hemisphere radiation budget in CMIP models
作者: Grise K.M. ; Polvani L.M. ; Fasullo J.T.
刊名: Journal of Climate
ISSN: 8948755
出版年: 2015
卷: 28, 期: 23 起始页码: 9298
结束页码: 9312
语种: 英语
Scopus关键词: Budget control
; Carbon dioxide
; Clouds
; Oceanography
; Radiation
; Tropics
; Climate sensitivity
; Geographic location
; Radiation budget
; Southern Hemisphere
; Southern ocean
; Climate models
; atmospheric modeling
; climate modeling
; climatology
; net radiation
; radiation budget
; Southern Hemisphere
; top of atmosphere
; Southern Ocean
英文摘要: Recent efforts to narrow the spread in equilibrium climate sensitivity (ECS) across global climate models have focused on identifying observationally based constraints, which are rooted in empirical correlations between ECS and biases in the models' present-day climate. This study reexamines one such constraint identified from CMIP3 models: the linkage between ECS and net top-of-the-atmosphere radiation biases in the Southern Hemisphere (SH). As previously documented, the intermodel spread in the ECS of CMIP3 models is linked to present-day cloud and net radiation biases over the midlatitude Southern Ocean, where higher cloud fraction in the present-day climate is associated with larger values of ECS. However, in this study, no physical explanation is found to support this relationship. Furthermore, it is shown here that this relationship disappears in CMIP5 models and is unique to a subset of CMIP models characterized by unrealistically bright present-day clouds in the SH subtropics. In view of this evidence, Southern Ocean cloud and net radiation biases appear inappropriate for providing observationally based constraints on ECS. Instead of the Southern Ocean, this study points to the stratocumulus-to-cumulus transition regions of the SH subtropical oceans as key to explaining the intermodel spread in the ECS of both CMIP3 and CMIP5 models. In these regions, ECS is linked to present-day cloud and net radiation biases with a plausible physical mechanism: models with brighter subtropical clouds in the present-day climate show greater ECS because 1) subtropical clouds dissipate with increasing CO2 concentrations in many models and 2) the dissipation of brighter clouds contributes to greater solar warming of the surface. © 2015 American Meteorological Society. 资助项目: DOE, National Science Foundation
; NSF, National Science Foundation
; National Science Foundation
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/50876
Appears in Collections: 气候变化事实与影响
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作者单位: Department of Environmental Sciences, University of Virginia, Charlottesville, VA, United States; Department of Applied Physics and Applied Mathematics, Department of Earth and Environmental Sciences, Columbia University, New York, NY, United States; Lamont-Doherty Earth Observatory, Columbia University, New York, NY, United States; National Center for Atmospheric Research, Boulder, CO, United States
Recommended Citation:
Grise K.M.,Polvani L.M.,Fasullo J.T.. Reexamining the relationship between climate sensitivity and the Southern Hemisphere radiation budget in CMIP models[J]. Journal of Climate,2015-01-01,28(23)