DOI: 10.1175/JCLI-D-11-00622.1
Scopus记录号: 2-s2.0-84859966114
论文题名: The influence of local feedbacks and northward heat transport on the equilibrium arctic climate response to increased greenhouse gas forcing
作者: Kay J.E. ; Holland M.M. ; Bitz C.M. ; Blanchard-Wrigglesworth E. ; Gettelman A. ; Conley A. ; Bailey D.
刊名: Journal of Climate
ISSN: 8948755
出版年: 2012
卷: 25, 期: 16 起始页码: 5433
结束页码: 5450
语种: 英语
Scopus关键词: Arctic
; Arctic climate
; Arctic ocean
; Arctic sea ice
; Arctic surface air temperature
; Atmospheric heat
; Atmospheric physics
; Atmospheric process
; Climate projection
; Community atmosphere model
; Coupled climate model
; Flux convergence
; Greenhouse-gas forcing
; Heat transport
; Ice loss
; Ocean model
; Radiative forcings
; Slab ocean
; Slab ocean models
; Surface albedo
; Surface climate
; Surface response
; Surface warming
; Atmospheric radiation
; Carbon dioxide
; Clouds
; Experiments
; Geophysics
; Greenhouse gases
; Heat flux
; Heat transfer
; Oceanography
; Sea ice
; Climate models
; arctic environment
; carbon dioxide
; climate change
; climate forcing
; climate modeling
; cloud
; greenhouse gas
; heat flux
; heat transfer
; radiative forcing
; Arctic
英文摘要: This study uses coupled climate model experiments to identify the influence of atmospheric physics [Community Atmosphere Model, versions 4 and 5 (CAM4; CAM5)] and ocean model complexity (slab ocean, full-depth ocean) on the equilibrium Arctic climate response to an instantaneous CO2 doubling. In slab ocean model (SOM) experiments using CAM4 and CAM5, local radiative feedbacks, not atmospheric heat flux convergence, are the dominant control on the Arctic surface response to increased greenhouse gas forcing. Equilibrium Arctic surface air temperature warming and amplification are greater in the CAM5 SOM experiment than in the equivalent CAM4 SOM experiment. Larger 2 3 CO2 radiative forcing, more positive Arctic surface albedo feedbacks, and less negative Arctic shortwave cloud feedbacks all contribute to greater Arctic surface warming and sea ice loss in CAM5 as compared to CAM4. When CAM4 is coupled to an active full-depth ocean model, Arctic Ocean horizontal heat flux convergence increases in response to the instantaneous CO2 doubling. Though this increased ocean northward heat transport slightly enhances Arctic sea ice extent loss, the representation of atmospheric processes (CAM4 versus CAM5) has a larger influence on the equilibrium Arctic surface climate response than the degree of ocean coupling (slab ocean versus fulldepth ocean). These findings underscore that local feedbacks can be more important than northward heat transport for explaining the equilibrium Arctic surface climate response and response differences in coupled climate models. That said, the processes explaining the equilibrium climate response differences here may be different than the processes explaining intermodel spread in transient climate projections. © 2012 American Meteorological Society. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/52305
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; Department of Atmospheric Sciences, University of Washington, Seattle, WA, United States
Recommended Citation:
Kay J.E.,Holland M.M.,Bitz C.M.,et al. The influence of local feedbacks and northward heat transport on the equilibrium arctic climate response to increased greenhouse gas forcing[J]. Journal of Climate,2012-01-01,25(16)