DOI: 10.1175/2011JCLI4240.1
Scopus记录号: 2-s2.0-84856961535
论文题名: Coupling modes among action centers of wave-mean flow interaction and their association with the AO/NAM
作者: Zhao N. ; Liang S. ; Ding Y.
刊名: Journal of Climate
ISSN: 8948755
出版年: 2012
卷: 25, 期: 2 起始页码: 447
结束页码: 458
语种: 英语
Scopus关键词: Annular mode
; Arctic Oscillation
; Baroclinic mode
; Barotropic structures
; Coherent structure
; Coupled mode
; Coupled oscillators
; Coupling mode
; Extratropical
; Local wave
; North Atlantic oscillations
; Northern Hemispheres
; Polar lows
; Polar vortex
; Sea level pressure
; Spatial structure
; Two-dimensional patterns
; Wave-mean-flow interaction
; Zonal wind
; Atmospheric pressure
; Atmospheric structure
; Atmospherics
; Sea level
; Troposphere
; Upper atmosphere
; Waves
; Flow interactions
; atmosphere-ocean coupling
; atmospheric modeling
; North Atlantic Oscillation
; Northern Hemisphere
; polar vortex
; stochasticity
; stratosphere
; troposphere
; Swinepox virus (STRAIN KASZA)
英文摘要: The Arctic Oscillation/Northern Hemisphere annular mode (AO/NAM) is attributed to wave-mean flow interaction over the extratropical region of the Northern Hemisphere. This wave-mean flow interaction is closely related to three atmospheric centers of action, corresponding to three regional oscillations: the NAO, the PNA, and the stratosphere polar vortex (SPV), respectively. It is then natural to infer that local wave- mean flow interactions at these three centers of action are dynamically coupled to each other and can thus explain the main aspects of the three-dimensional coherent structure of the annular mode, which also provides a possible way to understand how the local NAO-PNA-SPV perspective and the hemisphericAO/NAM perspective are interrelated. By using a linear stochastic model of coupled oscillators, this study suggests that two coupling modes among the PNA, NAO, and SPV are related to the two-dimensional pattern in sea level pressure of the AO. Although both of themmay contribute to the AO/NAM, only one is related to the threedimensional equivalent barotropic structure of the NAM, while the other one is mainly restricted to the troposphere. So the equivalent barotropic structure of the NAM, as usually revealed by the regression of the zonal wind against the AO index, is the manifestation of just one coupling mode. Another coupled mode is a baroclinic mode that resembles the NAM only in the troposphere. However, this similarity in spatial structures does not imply that the total variability of the AO/NAM index can be explained by those of the NAO-PNA-SPV or their coupling modes, because of the existence of the variability that may contribute to the AO/NAM, produced outside of these three regions. It is estimated that the coupling modes can jointly explain 44% of the variance of the AO/NAM index. © 2012 American Meteorological Society. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/52632
Appears in Collections: 气候变化事实与影响
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作者单位: State Key Laboratory of Severe Weather, Chinese Academy of Meteorological Sciences, Beijing, China; National Climate Center, Beijing, China
Recommended Citation:
Zhao N.,Liang S.,Ding Y.. Coupling modes among action centers of wave-mean flow interaction and their association with the AO/NAM[J]. Journal of Climate,2012-01-01,25(2)