DOI: 10.1175/JCLI-D-12-00104.1
Scopus记录号: 2-s2.0-84874807886
论文题名: Atmospheric circulation response to an instantaneous doubling of carbon dioxide. part ii: Atmospheric transient adjustment and its dynamics
作者: Wu Y. ; Seager R. ; Shaw T. ; Ting M. ; Naik N.
刊名: Journal of Climate
ISSN: 8948755
出版年: 2013
卷: 26, 期: 3 起始页码: 918
结束页码: 935
语种: 英语
Scopus关键词: Atmospheric circulation
; Eddies
; Large-scale motions
; Planetary Waves
; Stratospheric circulations
; Carbon dioxide
; Climatology
; Dynamics
; Refractive index
; Upper atmosphere
; Troposphere
; atmospheric circulation
; atmospheric dynamics
; atmospheric motion
; carbon dioxide
; eddy
; extratropical environment
; jet stream
; Northern Hemisphere
; planetary wave
; stratosphere
; tropopause
; troposphere
; westerly
英文摘要: The dynamical mechanisms underlying the transient circulation adjustment in the extratropical atmosphere after the instantaneous doubling of carbon dioxide are investigated using the National Center for Atmospheric Research Community Atmosphere Model version 3 coupled to a Slab Ocean Model. It is shown that the transient process during the first few months of integration is important in setting up the extratropical circulation response in equilibrium such as the poleward shift of the tropospheric jet streams. Three phases are found during the transient thermal/dynamical adjustment in the Northern Hemisphere: 1) a radiatively driven easterly anomaly in the subpolar stratosphere, 2) an acceleration of the westerly anomaly in the subpolar stratosphere as a result of anomalous planetary-scale eddy momentum flux convergence, and 3) a ''downward migration'' of the westerly anomaly from the lower stratosphere to the troposphere, followed by the tropospheric jet shift. Several proposed mechanisms for inducing the poleward shift of the tropospheric jet streams are examined. No significant increase in eddy phase speed is found. The rise in tropopause height appears to lead the tropospheric jet shift but no close relation is observed. The length scale of transient eddies does increase but does not lead the tropospheric jet shift. Finally, the tropospheric jet shift can be captured by changes in the index of refraction and the resulting anomalous eddy propagation in the troposphere. © 2013 American Meteorological Society. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/52007
Appears in Collections: 气候变化事实与影响
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作者单位: Courant Institute of Mathematical Sciences, New York University, New York, NY, United States; Lamont-Doherty Earth Observatory, Columbia University, Palisades, NY, United States
Recommended Citation:
Wu Y.,Seager R.,Shaw T.,et al. Atmospheric circulation response to an instantaneous doubling of carbon dioxide. part ii: Atmospheric transient adjustment and its dynamics[J]. Journal of Climate,2013-01-01,26(3)