DOI: 10.1175/JCLI-D-13-00404.1
Scopus记录号: 2-s2.0-84890226960
论文题名: Storm track shifts under climate change: What can be learned from large-scale dry dynamics
作者: Mbengue C. ; Schneider T.
刊名: Journal of Climate
ISSN: 8948755
出版年: 2013
卷: 26, 期: 24 起始页码: 9923
结束页码: 9930
语种: 英语
Scopus关键词: Convective stability
; Dynamical mechanisms
; General circulation model
; Hadley circulation
; Observational data
; Static stability
; Storm track
; Surface temperatures
; Atmospheric temperature
; Carbon dioxide
; Climate change
; Global warming
; Stability
; Storms
; atmospheric circulation
; atmospheric convection
; atmospheric dynamics
; atmospheric general circulation model
; atmospheric moisture
; climate change
; climate modeling
; global warming
; Hadley cell
; heat transfer
; storm track
; surface temperature
英文摘要: Earth's storm tracks are instrumental for transporting heat, momentum, and moisture and thus strongly influence the surface climate. Climate models, supported by a growing body of observational data, have demonstrated that storm tracks shift poleward as the climate warms. But the dynamical mechanisms responsible for this shift remain unclear. To isolate what portion of the storm track shift may be accounted for by large-scale dry dynamics alone, disregarding the latent heat released in phase changes of water, this study investigates the storm track shift under various kinds of climate change in an idealized dry general circulation model (GCM) with an adjustable but constant convective stability. It is found that increasing the mean surface temperature or the convective stability leads to poleward shifts of storm tracks, even if the convective stability is increased only in a narrow band around the equator. Under warming and convective stability changes roughly corresponding to a doubling of CO2 concentrations from a present-day Earthlike climate, storm tracks shift about 0.88 poleward, somewhat less than but in qualitative agreement with studies using moist GCMs. About 63% (0.58) of the poleward shift is shown to be caused by tropical convective stability variations. This demonstrates that tropical processes alone (the increased dry static stability of a warmer moist adiabat) can account for part of the poleward shift of storm tracks under global warming. This poleward shift generally occurs in tandem with a poleward expansion of the Hadley circulation; however, the Hadley circulation expansion does not always parallel the storm track shift. © 2013 American Meteorological Society.
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/51478
Appears in Collections: 气候变化事实与影响
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作者单位: California Institute of Technology, Pasadena, CA, United States; Swiss Federal Institute of Technology Zurich, Zurich, Switzerland
Recommended Citation:
Mbengue C.,Schneider T.. Storm track shifts under climate change: What can be learned from large-scale dry dynamics[J]. Journal of Climate,2013-01-01,26(24)