气候变化领域集成服务门户(CCPortal): Seasonally-dependent impact of easterly wind bursts on the development of El Niño events

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DOI	10.1007/s00382-019-04688-2
	Seasonally-dependent impact of easterly wind bursts on the development of El Niño events
	Fan H.; Huang B.; Yang S.; Li Z.; Deng K.
发表日期	2019
ISSN	0930-7575
起始页码	1527
结束页码	1546
卷号	53 期号:2020-03-04
英文摘要	Westerly wind bursts play an important role in the development of El Niño-Southern Oscillation (ENSO) events. However, the impact of easterly wind bursts (EWBs) on the development of ENSO is still unclear. In particular, a series of strong EWBs in the summer of 2014 aroused arguments about their importance in suppressing the potential warming in the summer. In this study, we conduct a series of sensitivity experiments using the fully-coupled NCAR Community Earth System Model with prescribed strong EWBs to distinguish their impact on the development of the model El Niño events, as well as the seasonality of the potential impact. Model results indicate that wintertime warming is significantly suppressed by the EWBs in summer due to the strongest ocean–atmosphere interaction associated with the most unstable background coupled system. With stronger anomalous zonal SST gradient and relatively more stable background state, the EWB-induced cooling in autumn is smaller than the cooling induced by the summertime EWBs. In spring when the ocean–atmosphere interaction is relatively weaker, the impact of EWBs depends on the EWB-forced shift of the eastern edge of warm pool (EEWP), which is critical for the establishment of positive Bjerknes feedback. A mixed layer heat budget analysis further suggests that the seasonally-dependent impact of EWBs is mainly controlled by the zonal advective feedback process associated with the subsequent ocean–atmosphere interaction and to some extent related to the thermocline feedback as well. This study demonstrates that EWBs increase the uncertainty of the prediction of ENSO initialized in boreal spring and early summer even if the ocean subsurface precursors are strong. © 2019, The Author(s).
英文关键词	Bjerknes feedback; Easterly wind burst; Seasonality; Zonal advective feedback
语种	英语
scopus关键词	advection; air-sea interaction; climate feedback; El Nino; El Nino-Southern Oscillation; seasonality; summer; thermocline; uncertainty analysis; warming; wind field; zonal wind
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/146137
作者单位	School of Atmospheric Sciences, Sun Yat-sen University, 135 West Xingang Road, Guangzhou, 510275, China; Department of Atmospheric, Oceanic, and Earth Sciences and Center for Ocean-Land-Atmosphere Studies, George Mason University, Fairfax, VA, United States; Guangdong Province Key Laboratory for Climate Change and Natural Disaster Studies, Sun Yat-sen University, Guangzhou, China; Southern Laboratory of Ocean Science and Engineering, Zhuhai, Guangdong, China
推荐引用方式 GB/T 7714	Fan H.,Huang B.,Yang S.,et al. Seasonally-dependent impact of easterly wind bursts on the development of El Niño events[J],2019,53(2020-03-04).
APA	Fan H.,Huang B.,Yang S.,Li Z.,&Deng K..(2019).Seasonally-dependent impact of easterly wind bursts on the development of El Niño events.Climate Dynamics,53(2020-03-04).
MLA	Fan H.,et al."Seasonally-dependent impact of easterly wind bursts on the development of El Niño events".Climate Dynamics 53.2020-03-04(2019).