DOI: 10.1175/JCLI-D-12-00175.1
Scopus记录号: 2-s2.0-84877641946
论文题名: The role of oceans and sea ice in abrupt transitions between multiple climate states
作者: Rose B.E.J. ; Ferreira D. ; Marshall J.
刊名: Journal of Climate
ISSN: 8948755
出版年: 2013
卷: 26, 期: 9 起始页码: 2862
结束页码: 2879
语种: 英语
Scopus关键词: Abrupt transition
; General circulation model
; Ice-free conditions
; Irreversible changes
; Meridional overturning circulations
; Model configuration
; Ocean circulation
; Radiative forcings
; Atmospheric radiation
; Climate change
; Glacial geology
; Sea ice
; atmosphere-ice-ocean system
; atmospheric dynamics
; atmospheric forcing
; climate change
; cooling
; general circulation model
; oceanic circulation
; radiative forcing
; sea ice
; timescale
; warming
英文摘要: The coupled climate dynamics underlying large, rapid, and potentially irreversible changes in ice cover are studied.A global atmosphere-ocean-sea ice general circulation model with idealized aquaplanet geometry is forced by gradual multi-millennial variations in solar luminosity. The model traverses a hysteresis loop between warm ice-free conditions and cold glacial conditions in response to ±5 W m-2 variations in global, annual-mean insolation. Comparison of several model configurations confirms the importance of polar ocean processes in setting the sensitivity and time scales of the transitions. A "sawtooth"character is found with fasterwarming and slower cooling, reflecting the opposing effects of surface heating and cooling on upper-ocean buoyancy and, thus, effective heat capacity. The transition from a glacial to warm, equable climate occurs in about 200 years. In contrast to the "freshwater hosing"scenario, transitions are driven by radiative forcing and sea ice feedbacks. The ocean circulation, and notably the meridional overturning circulation (MOC), does not drive the climate change. The MOC (and associated heat transport) collapses poleward of the advancing ice edge, but this is a purely passive response to cooling and ice expansion. The MOC does, however, play a key role in setting the time scales of the transition and contributes to the asymmetry between warming and cooling. © 2013 American Meteorological Society. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/51903
Appears in Collections: 气候变化事实与影响
There are no files associated with this item.
作者单位: Department of Atmospheric Sciences, University of Washington, Seattle, WA, United States; Department of Earth, Atmospheric and Planetary Sciences, Massachusetts Institute of Technology, Cambridge, MA, United States
Recommended Citation:
Rose B.E.J.,Ferreira D.,Marshall J.. The role of oceans and sea ice in abrupt transitions between multiple climate states[J]. Journal of Climate,2013-01-01,26(9)