气候变化领域集成服务门户(CCPortal): Normal Mode Perspective on the 2016 QBO Disruption: Evidence for a Basic State Regime Transition

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DOI	10.1029/2020GL087274
	Normal Mode Perspective on the 2016 QBO Disruption: Evidence for a Basic State Regime Transition
	Raphaldini B.; Wakate Teruya A.S.; Silva Dias P.L.; Chavez Mayta V.R.; Takara V.J.
发表日期	2020
ISSN	0094-8276
卷号	47 期号:14
英文摘要	A normal mode decomposition of the dynamical structure of the quasi-biennial oscillation (QBO) is presented in this article. It was found that the QBO is predominantly described by Rossby modes as well as westward inertio-gravity modes with a low meridional mode index. We show that the 2016 QBO disruption was accompanied by an extreme amplitude event of an asymmetric zonal Rossby mode (with meridional index 4) consisting of the largest amplitude in 40 years. This component of the zonal flow favors the convergence of eastward momentum in the equatorial region, controlling the perturbations to the QBO. The zonal winds associated with this mode are extremely intermittent with heavy tail distributions. Our statistical analysis indicates a regime transition in this zonal mode in the recent decades, favoring stronger perturbations to the QBO. ©2020. American Geophysical Union. All Rights Reserved.
英文关键词	Geophysics; Dynamical structure; Equatorial regions; Gravity modes; Heavy-tails; Normal modes; Quasi-biennial oscillation; Regime transition; Zonal modes; Earth sciences; amplitude; quasi-biennial oscillation; Rossby wave; zonal flow; zonal wind
语种	英语
来源期刊	Geophysical Research Letters
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/170113
作者单位	Departamento de Ciências Atmosféricas, Instituto de Astronomia, Geofisica e Ciencias Atmosfericas, Universidade de Sao Paulo, Sao Paulo, Brazil; Instituto de Matemática e Estatística, Universidade de Sao Paulo, Sao Paulo, Brazil
推荐引用方式 GB/T 7714	Raphaldini B.,Wakate Teruya A.S.,Silva Dias P.L.,et al. Normal Mode Perspective on the 2016 QBO Disruption: Evidence for a Basic State Regime Transition[J],2020,47(14).
APA	Raphaldini B.,Wakate Teruya A.S.,Silva Dias P.L.,Chavez Mayta V.R.,&Takara V.J..(2020).Normal Mode Perspective on the 2016 QBO Disruption: Evidence for a Basic State Regime Transition.Geophysical Research Letters,47(14).
MLA	Raphaldini B.,et al."Normal Mode Perspective on the 2016 QBO Disruption: Evidence for a Basic State Regime Transition".Geophysical Research Letters 47.14(2020).