气候变化领域集成服务门户(CCPortal): Revisiting MJO; Kelvin waves; and El Niño relationships using a simple ocean model

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DOI	10.1007/s00382-019-04936-5
	Revisiting MJO; Kelvin waves; and El Niño relationships using a simple ocean model
	Lybarger N.D.; Stan C.
发表日期	2019
ISSN	0930-7575
起始页码	6363
结束页码	6377
卷号	53 期号:2020-09-10
英文摘要	Mechanisms governing interactions between the Madden–Julian Oscillation (MJO), Kelvin wave activity, and El Niño development are reexamined using the oceanic component of the Zebiak–Cane (ZCocn) model of the Pacific basin. Prescribed wind stress from a free run of the super-parameterized Community Climate System Model version 4 (SP-CCSM4) is used to force ZCocn and the simulated El Niño events are analyzed with respect to their relationship with the MJO wind forcing. Composites of El Niño events strongly influenced by the MJO show the earlier onset of a flattened, El Niño-like state of the thermocline. In contrast, the composites of El Niño events not influenced by the MJO winds show a later onset, and are dominated by a transient-like thermocline along with periods of upwelling Kelvin wave activity. Sensitivity experiments performed to identify whether modifying MJO wind stress and oceanic Kelvin wave activity influences these features show that although MJO contributes to the development of these features, it is not necessarily the primary driver. The relative phasing between MJO and oceanic Kelvin wave activity seems to be the most important factor governing the influence of MJO on El Niño. When in phase and collocated with Kelvin wave activity, MJO westerly wind stress contributes to the amplification of preexisting downwelling Kelvin waves, leading to earlier onset and greater strength of the resulting El Niño events. The out-of-phase interactions between MJO and oceanic Kelvin waves explain the observed lack of influence of MJO onto some El Niño events. © 2019, Springer-Verlag GmbH Germany, part of Springer Nature.
语种	英语
scopus关键词	El Nino; Kelvin wave; Madden-Julian oscillation; ocean wave; thermocline; upwelling; wind forcing; Pacific Ocean
来源期刊	Climate Dynamics
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/145867
作者单位	Department of Atmospheric, Oceanic, and Earth Science, George Mason University, 4400 University Drive, Fairfax, VA 22030, United States; Center for Ocean-Land-Atmosphere Studies, Fairfax, VA 22030, United States
推荐引用方式 GB/T 7714	Lybarger N.D.,Stan C.. Revisiting MJO; Kelvin waves; and El Niño relationships using a simple ocean model[J],2019,53(2020-09-10).
APA	Lybarger N.D.,&Stan C..(2019).Revisiting MJO; Kelvin waves; and El Niño relationships using a simple ocean model.Climate Dynamics,53(2020-09-10).
MLA	Lybarger N.D.,et al."Revisiting MJO; Kelvin waves; and El Niño relationships using a simple ocean model".Climate Dynamics 53.2020-09-10(2019).