气候变化领域集成服务门户(CCPortal): The Unique Characteristics and Potential Mechanisms of the MJO-QBO Relationship

CCPortal

DOI	10.1029/2020JD033196
	The Unique Characteristics and Potential Mechanisms of the MJO-QBO Relationship
	Sakaeda N.; Dias J.; Kiladis G.N.
发表日期	2020
ISSN	2169897X
卷号	125 期号:17
英文摘要	Previous studies have shown that Madden-Julian oscillation (MJO) convective activity increases when quasi-biennial oscillation (QBO) easterlies appear in the lower stratosphere, and that this relationship is seen only during boreal winter. However, the physical mechanism behind this relationship is not fully understood. Building upon previous literature on the MJO-QBO relationship, this study first tests whether the relationship between the QBO and MJO extends to other modes of organized tropical convection. Our analysis shows that the QBO does not have any significant relationship with other modes of variability such as convectively coupled equatorial waves (CCEWs). An extended analysis for periods prior to 1979 also shows that the boreal winter QBO-MJO relationship substantially weakens prior to 1979. These results imply that, in addition to the seasonal dependence, any proposed mechanisms for the relationship between the QBO and MJO must be able to explain the uniqueness of this relationship with respect to other CCEWs, as well as the reason for its strengthening after 1979. Among the analyzed modes of tropical convection, the MJO is the most sensitive to the modulation of high cloud fraction and associated radiative feedback by the QBO and this sensitivity may weaken prior to 1979. These results indicate that the strong top-heaviness of vertical motion and cloud-radiative feedback associated with the MJO are important to explain its unique relationship with the QBO. © 2020. American Geophysical Union. All Rights Reserved.
英文关键词	Madden Julian Oscillation; quasi-biennial oscillation; tropical convection
语种	英语
来源期刊	Journal of Geophysical Research: Atmospheres
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/185808
作者单位	School of Meteorology, University of Oklahoma, Norman, OK, United States; Physical Sciences Laboratory, NOAA, Boulder, CO, United States
推荐引用方式 GB/T 7714	Sakaeda N.,Dias J.,Kiladis G.N.. The Unique Characteristics and Potential Mechanisms of the MJO-QBO Relationship[J],2020,125(17).
APA	Sakaeda N.,Dias J.,&Kiladis G.N..(2020).The Unique Characteristics and Potential Mechanisms of the MJO-QBO Relationship.Journal of Geophysical Research: Atmospheres,125(17).
MLA	Sakaeda N.,et al."The Unique Characteristics and Potential Mechanisms of the MJO-QBO Relationship".Journal of Geophysical Research: Atmospheres 125.17(2020).