DOI: 10.1029/2017JD027977
Scopus记录号: 2-s2.0-85047457161
论文题名: Modulation of the MJO and North Pacific Storm Track Relationship by the QBO
作者: Wang J. ; Kim H.-M. ; Chang E.K.M. ; Son S.-W.
刊名: Journal of Geophysical Research: Atmospheres
ISSN: 2169897X
出版年: 2018
卷: 123, 期: 8 起始页码: 3976
结束页码: 3992
语种: 英语
英文关键词: MJO
; North Pacific storm track
; QBO
Scopus关键词: amplitude
; baroclinic motion
; Madden-Julian oscillation
; oceanic convection
; quasi-biennial oscillation
; Rossby wave
; spatial distribution
; storm track
; teleconnection
; westerly
; Indian Ocean
; Pacific Ocean
; Pacific Ocean (North)
英文摘要: This study demonstrates a possible impact of the quasi-biennial oscillation (QBO) on the Madden-Julian Oscillation (MJO)-related North Pacific storm track (NPST) change during October–March for the period of 1979–2016. The NPST shows significant intraseasonal changes in response to the MJO. In general, when the MJO convection is located over the Indian Ocean (western to central Pacific), the NPST tends to shift poleward (southward). This MJO-related NPST change has larger amplitude during the easterly phase of the QBO (EQBO) than during its westerly phase (WQBO). The spatial distribution of this NPST change also exhibits significant differences between the two QBO phases with a zonally elongated pattern during EQBO winters but separated into two centers during WQBO winters. Diagnoses of the dynamical processes associated with the NPST change indicate the dominant roles of the baroclinic energy conversion and downstream energy propagation. The analysis of intraseasonal flow change indicates a larger amplitude of the MJO-related baroclinicity over the North Pacific. This is likely due to a stronger MJO and associated Rossby wave source in EQBO winters, which may give rise to the enhanced amplitude of the NPST change. On the other hand, different spatial distribution of the NPST change is likely a result of a direct impact of the QBO on the NPST. These results suggest that the QBO impact needs to be considered for better reproduction of the MJO-NPST teleconnection in general circulation models, which may also benefit subseasonal prediction of extratropical storm activities. ©2018. American Geophysical Union. All Rights Reserved. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/114051
Appears in Collections: 气候减缓与适应
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作者单位: School of Marine and Atmospheric Sciences, Stony Brook University, Stony Brook, NY, United States; School of Earth and Environmental Sciences, Seoul National University, Seoul, South Korea
Recommended Citation:
Wang J.,Kim H.-M.,Chang E.K.M.,et al. Modulation of the MJO and North Pacific Storm Track Relationship by the QBO[J]. Journal of Geophysical Research: Atmospheres,2018-01-01,123(8)