DOI: 10.1007/s00382-013-1682-3
Scopus记录号: 2-s2.0-84888029321
论文题名: The respective roles of surface temperature driven feedbacks and tropospheric adjustment to CO2 in CMIP5 transient climate simulations
作者: Tomassini L. ; Geoffroy O. ; Dufresne J.-L. ; Idelkadi A. ; Cagnazzo C. ; Block K. ; Mauritsen T. ; Giorgetta M. ; Quaas J.
刊名: Climate Dynamics
ISSN: 9307575
出版年: 2013
卷: 41, 期: 2017-11-12 起始页码: 3103
结束页码: 3126
语种: 英语
英文关键词: Climate feedbacks
; Transient climate response
; Tropospheric adjustment
英文摘要: An overview of radiative climate feedbacks and ocean heat uptake efficiency diagnosed from idealized transient climate change experiments of 14 CMIP5 models is presented. Feedbacks explain about two times more variance in transient climate response across the models than ocean heat uptake efficiency. Cloud feedbacks can clearly be identified as the main source of inter-model spread. Models with strong longwave feedbacks in the tropics feature substantial increases in cloud ice around the tropopause suggestive of changes in cloud-top heights. The lifting of the tropical tropopause goes together with a general weakening of the tropical circulation. Distinctive inter-model differences in cloud shortwave feedbacks occur in the subtropics including the equatorward flanks of the storm-tracks. Related cloud fraction changes are not confined to low clouds but comprise middle level clouds as well. A reduction in relative humidity through the lower and mid troposphere can be identified as being the main associated large-scale feature. Experiments with prescribed sea surface temperatures are analyzed in order to investigate whether the diagnosed feedbacks from the transient climate simulations contain a tropospheric adjustment component that is not conveyed through the surface temperature response. The strengths of the climate feedbacks computed from atmosphere-only experiments with prescribed increases in sea surface temperatures, but fixed CO2 concentrations, are close to the ones derived from the transient experiment. Only the cloud shortwave feedback exhibits discernible differences which, however, can not unequivocally be attributed to tropospheric adjustment to CO2. Although for some models a tropospheric adjustment component is present in the global mean shortwave cloud feedback, an analysis of spatial patterns does not lend support to the view that cloud feedbacks are dominated by their tropospheric adjustment part. Nevertheless, there is positive correlation between the strength of tropospheric adjustment processes and cloud feedbacks across different climate models. © 2013 Springer-Verlag Berlin Heidelberg. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/54714
Appears in Collections: 过去全球变化的重建
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作者单位: Max Planck Institute for Meteorology, Hamburg, Germany; CNRM-GAME, Météo France, CNRS, Toulouse, France; Laboratoire de Météorologie Dynamique, Istitut Pierre Simon Laplace (LMD/IPSL), Paris, France; Istituto di Scienze dell'Atmosfera e del Clima, CNR, Rome, Italy; Meteorological Institute, University of Leipzig, Leipzig, Germany
Recommended Citation:
Tomassini L.,Geoffroy O.,Dufresne J.-L.,et al. The respective roles of surface temperature driven feedbacks and tropospheric adjustment to CO2 in CMIP5 transient climate simulations[J]. Climate Dynamics,2013-01-01,41(2017-11-12)