DOI: 10.1175/JCLI-D-18-0099.1
Scopus记录号: 2-s2.0-85060975646
论文题名: The circulation response to volcanic eruptions: The key roles of stratospheric warming and eddy interactions
作者: Dallasanta K. ; Gerber E.P. ; Toohey M.
刊名: Journal of Climate
ISSN: 8948755
出版年: 2019
卷: 32, 期: 4 起始页码: 1101
结束页码: 1120
语种: 英语
英文关键词: Atmosphere
; Empirical orthogonal functions
; General circulation models
; Volcanoes
Scopus关键词: Aerosols
; Earth atmosphere
; Orthogonal functions
; Atmospheric physics
; Empirical Orthogonal Function
; Extratropical circulation
; General circulation model
; Natural variability
; Southern Hemisphere
; Stratospheric aerosols
; Stratospheric warmings
; Volcanoes
英文摘要: Proxy data and observations suggest that large tropical volcanic eruptions induce a poleward shift of the North Atlantic jet stream in boreal winter. However, there is far from universal agreement in models on this effect and its mechanism, and the possibilities of a corresponding jet shift in the Southern Hemisphere or the summer season have received little attention. Using a hierarchy of simplified atmospheric models, this study examines the impact of stratospheric aerosol on the extratropical circulation over the annual cycle. In particular, the models allow the separation of the dominant shortwave (surface cooling) and longwave (stratospheric warming) impacts of volcanic aerosol. It is found that stratospheric warming shifts the jet poleward in both the summer and winter hemispheres. The experiments cannot definitively rule out the role of surface cooling, but they provide no evidence that it shifts the jet poleward. Further study with simplified models demonstrates that the response to stratospheric warming is remarkably generic and does not depend critically on the boundary conditions (e.g., the planetary wave forcing) or the atmospheric physics (e.g., the treatment of radiative transfer and moist processes). It does, however, fundamentally involve both zonal-mean and eddy circulation feedbacks. The time scales, seasonality, and structure of the response provide further insight into the mechanism, as well as its connection to modes of intrinsic natural variability. These findings have implications for the interpretation of comprehensive model studies and for postvolcanic prediction. © 2019 American Meteorological Society. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/117215
Appears in Collections: 气候变化与战略
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Recommended Citation:
Dallasanta K.,Gerber E.P.,Toohey M.. The circulation response to volcanic eruptions: The key roles of stratospheric warming and eddy interactions[J]. Journal of Climate,2019-01-01,32(4)