DOI: 10.1175/JCLI-D-13-00311.1
Scopus记录号: 2-s2.0-84897656067
论文题名: Modeling obliquity and CO2 effects on southern hemisphere climate during the past 408 ka
作者: Timmermann A. ; Friedrich T. ; Timm O.E. ; Chikamoto M.O. ; Abe-Ouchi A. ; Ganopolski A.
刊名: Journal of Climate
ISSN: 8948755
出版年: 2014
卷: 27, 期: 5 起始页码: 1863
结束页码: 1875
语种: 英语
Scopus关键词: Atmospheric baroclinicity
; Coupled general circulation models
; Earth system model of intermediate complexity
; Greenhouse-gas forcing
; Interdisciplinary research
; Meridional heat transports
; Southern Hemisphere
; Temperature changes
; Atmospheric radiation
; Atmospheric temperature
; Climate models
; Computer simulation
; Earth (planet)
; Experiments
; Greenhouse gases
; Heat transfer
; Sea ice
; Storms
; Troposphere
; Carbon dioxide
; carbon dioxide
; general circulation model
; greenhouse gas
; heat transfer
; meridional circulation
; numerical model
; obliquity
; paleoclimate
; radiative forcing
; Southern Hemisphere
; storm track
; temperature effect
; temperature gradient
; troposphere
; Antarctica
英文摘要: The effect of obliquity and CO2 changes on Southern Hemispheric climate is studied with a series of numerical modeling experiments. Using the Earth system model of intermediate complexity Loch-VECODE-ECBilt-CLIO-Agism Model (LOVECLIM) and a coupled general circulation model [Model for Interdisciplinary Research on Climate (MIROC)], it is shown in time-slice simulations that phases of low obliquity enhance the meridional extratropical temperature gradient, increase the atmospheric baroclinicity, and intensify the lower and middle troposphere Southern Hemisphere westerlies and storm tracks. Furthermore, a transient model simulation is conducted with LOVECLIM that covers the greenhouse gas, ice sheet, and orbital forcing history of the past 408 ka. This simulation reproduces reconstructed glacial- interglacial variations in temperature and sea ice qualitatively well and shows that the meridional heat transport associated with the orbitally paced modulation of middle troposphere westerlies and storm tracks partly offsets the effects of the direct shortwave obliquity forcing over Antarctica, thereby reinforcing the high correlation between CO2 radiative forcing and Antarctic temperature. The overall timing of temperature changes in Antarctica is hence determined by a balance of shortwave obliquity forcing, atmospheric heat transport changes, and greenhouse gas forcing. A shorter 130-ka transient model experiment with constant CO2 concentrations further demonstrates that surface Southern Hemisphere westerlies are primarily modulated by the obliquity cycle rather than by the CO2 radiative forcing. © 2014 American Meteorological Society. 资助项目: NSF, 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/50920
Appears in Collections: 气候变化事实与影响
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作者单位: IPRC, SOEST, University of Hawai'i at Maanoa, Honolulu, HI, United States; Atmosphere and Ocean Research Institute, University of Tokyo, Kashiwa Chiba, Yokohama, Japan; RIGC/JAMSTEC, Yokohama Institute for Earth Sciences, Yokohama, Japan; Potsdam Institute for Climate Impact Research, Potsdam, Germany
Recommended Citation:
Timmermann A.,Friedrich T.,Timm O.E.,et al. Modeling obliquity and CO2 effects on southern hemisphere climate during the past 408 ka[J]. Journal of Climate,2014-01-01,27(5)