Modulation of ENSO on Fast and Slow MJO Modes during Boreal Winter

doi:10.1175/JCLI-D-19-0013.1

CORC > 海洋研究所 > 中国科学院海洋研究所 > 海洋环流与波动重点实验室

	Modulation of ENSO on Fast and Slow MJO Modes during Boreal Winter
	Wei, Yuntao 1,2,3; Ren, Hong-Li 3
刊名	JOURNAL OF CLIMATE
	2019-11-01
卷号	32 期号:21 页码:7483-7506
关键词	Tropics ENSO Madden-Julian oscillation Air-sea interaction Regression analysis Intraseasonal variability
ISSN号	0894-8755
DOI	10.1175/JCLI-D-19-0013.1
通讯作者	Ren, Hong-Li(renhl@cma.gov.cn)
英文摘要	This study investigates modulation of El Nino-Southern Oscillation (ENSO) on the Madden-Julian oscillation (MJO) propagation during boreal winter. Results show that the spatiotemporal evolution of MJO manifests as a fast equatorially symmetric propagation from the Indian Ocean to the equatorial western Pacific (EWP) during El Nino, whereas the MJO during La Nina is very slow and tends to frequently "detour" via the southern Maritime Continent (MC). The westward group velocity of the MJO is also more significant during El Nino. Based on the dynamics-oriented diagnostics, it is found that, during El Nino, the much stronger leading suppressed convection over the EWP excites a significant front Walker cell, which further triggers a larger Kelvin wave easterly wind anomaly and premoistening and heating effects to the east. However, the equatorial Rossby wave to the west tends to decouple with the MJO convection. Both effects can result in fast MJO propagation. The opposite holds during La Nina. A column-integrated moisture budget analysis reveals that the sea surface temperature anomaly driving both the eastward and equatorward gradients of the low-frequency moisture anomaly during El Nino, as opposed to the westward and poleward gradients during La Nina, induces moist advection over the equatorial eastern MC-EWP region due to the intraseasonal wind anomaly and therefore enhances the zonal asymmetry of the moisture tendency, supporting fast propagation. The role of nonlinear advection by synoptic-scale Kelvin waves is also nonnegligible in distinguishing fast and slow MJO modes. This study emphasizes the crucial roles of dynamical wave feedback and moisture-convection feedback in modulating the MJO propagation by ENSO.
资助项目	National Key Research and Development Program on Monitoring, Early Warning and Prevention of Major Natural Disaster[2018YFC1506004] ; National Basic Research (973) Program of China[2015CB453203] ; China National Science Foundation[41775066] ; China National Science Foundation[41375062] ; NSFC Innovative Group Grant[41421005] ; NSFC-Shandong Joint Fund for Marine Science Research Centers[U1406401]
WOS研究方向	Meteorology & Atmospheric Sciences
语种	英语
出版者	AMER METEOROLOGICAL SOC
WOS记录号	WOS:000488785800003
内容类型	期刊论文
源URL	[http://ir.qdio.ac.cn/handle/337002/163377]
专题	海洋研究所_海洋环流与波动重点实验室
通讯作者	Ren, Hong-Li
作者单位	1.Univ Chinese Acad Sci, Beijing, Peoples R China 2.Chinese Acad Sci, Inst Oceanol, Key Lab Ocean Circulat & Waves, Qingdao, Shandong, Peoples R China 3.Nanjing Univ, Lab Climate Studies & China Meteorol Adm, Joint Lab Climate Predict Studies, Natl Climate Ctr,China Meteorol Adm, Beijing, Peoples R China
推荐引用方式 GB/T 7714	Wei, Yuntao,Ren, Hong-Li. Modulation of ENSO on Fast and Slow MJO Modes during Boreal Winter[J]. JOURNAL OF CLIMATE,2019,32(21):7483-7506.
APA	Wei, Yuntao,&Ren, Hong-Li.(2019).Modulation of ENSO on Fast and Slow MJO Modes during Boreal Winter.JOURNAL OF CLIMATE,32(21),7483-7506.
MLA	Wei, Yuntao,et al."Modulation of ENSO on Fast and Slow MJO Modes during Boreal Winter".JOURNAL OF CLIMATE 32.21(2019):7483-7506.