DOI: 10.1175/JCLI-D-16-0049.1
Scopus记录号: 2-s2.0-84987936621
论文题名: Understanding the links between subtropical and extratropical circulation responses to climate change using aquaplanet model simulations
作者: Shaw T.A. ; Voigt A.
刊名: Journal of Climate
ISSN: 8948755
出版年: 2016
卷: 29, 期: 18 起始页码: 6637
结束页码: 6657
语种: 英语
Scopus关键词: Atmospheric movements
; Atmospheric temperature
; Climate models
; Dynamics
; Global warming
; Mechanical waves
; Momentum
; Oceanography
; Surface waters
; Tropics
; Atmospheric circulation
; Energy transport
; Extratropical circulation
; Mixing length theories
; Regional climate changes
; Rossby wave
; Sea surface temperature (SST)
; Stationary waves
; Climate change
英文摘要: Previous research has shown that subtropical and extratropical circulations are linked seasonally and in response to climate change. In particular, amplification (weakening) of subtropical stationary eddies is linked to a poleward (equatorward) shift of the extratropical circulation in the Northern Hemisphere. Here the mechanisms linking subtropical and extratropical circulation responses to climate change are examined using prescribed sea surface temperature aquaplanet simulations with a subtropical zonal asymmetry that mimics land-ocean contrasts. A poleward circulation shift occurs in response to uniform global warming even in the presence of subtropical stationary eddies. Subtropical stationary eddies exhibit a weak response to global warming; however, regional warming of temperature (or equivalent potential temperature) over land (ocean) increases (decreases) stationary eddy amplitude and shifts the extratropical circulation poleward (equatorward), consistent with comprehensive models. The stationary eddy response to regional warming is connected to regional moist entropy gradient, energy input to the atmosphere, and gross moist stability changes. Stationary eddy amplitude changes directly affect momentum and moist static energy transport following linear wave and mixing length theories. The transport changes do not follow a fixed-diffusivity framework. Extratropical transient eddy transport changes compensate ~70%-90% of the subtropical stationary eddy transport response. This assumes exact subtropical compensation accounts for a large fraction of the meridional shift of the extratropical circulation in response to regional climate change. © 2016 American Meteorological Society. 资助项目: NSF, Norwegian Nurses Organisation
Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/50164
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 the Geophysical Sciences, University of Chicago, Chicago, IL, United States; Lamont-Doherty Earth Observatory, Columbia University, Palisades, NY, United States
Recommended Citation:
Shaw T.A.,Voigt A.. Understanding the links between subtropical and extratropical circulation responses to climate change using aquaplanet model simulations[J]. Journal of Climate,2016-01-01,29(18)