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DOI	10.1007/s00382-019-04732-1
	Mechanisms causing east Australian spring rainfall differences between three strong El Niño events
	van Rensch P.; Arblaster J.; Gallant A.J.E.; Cai W.; Nicholls N.; Durack P.J.
发表日期	2019
ISSN	0930-7575
起始页码	3641
结束页码	3659
卷号	53 期号:2020-05-06
英文摘要	Strong El Niño events have had significant impacts on society through their association with extreme events, such as droughts and floods. However, questions remain as to the robustness of strong El Niño events in forcing regional climate variability. The strong 1982, 1997 and 2015 El Niño events were of similar type and strength, but in eastern Australia they were associated with differing spring rainfall anomaly magnitudes and patterns. To understand these differences, we first determined the most important processes for teleconnecting the El Niño signal to east Australian spring rainfall using historical relationships with winds and sea level pressure. Then, using a 60-member atmospheric model ensemble, we estimated the influence of sea surface temperatures (SSTs) on Australian atmospheric circulation and rainfall during these three El Niño events relative to internal variability. We found that the different east Australian spring rainfall anomalies for each of the three El Niño events are best explained by differences in the strength of the meridional wind component of the regional circulation. All three El Niño events exhibited a positive sea level pressure anomaly to the south of Australia, which was associated with rainfall deficits along the southeast Australian coast. The experiments indicate the regional atmospheric circulation and rainfall differences were forced by SSTs during spring of 1982 and 1997, with their influence on the circulation in 2015 remaining unclear. We also show that SSTs adjacent to Australia further contributed to the modelled rainfall differences mainly by regulating moisture availability. © 2019, Springer-Verlag GmbH Germany, part of Springer Nature.
英文关键词	1982–1983; 1997–1998; 2015–2016; Climate variability; Extreme El Niño; Precipitation; Super El Niño
语种	英语
scopus关键词	atmospheric circulation; atmospheric moisture; climate variation; El Nino; extreme event; precipitation (climatology); rainfall; regional climate; sea surface temperature; spring (season); teleconnection; twentieth century; Australia
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/146016
作者单位	Earth, Atmosphere and Environment, Monash University, Clayton, VIC, Australia; CSIRO, Aspendale, VIC, Australia; ARC Centre of Excellence for Climate Systems Science, Monash University, Clayton, VIC, Australia; National Center for Atmospheric Research, Boulder, CO, United States; ARC Centre of Excellence for Climate Extremes, Monash University, Clayton, VIC, Australia; Program for Climate Model Diagnosis and Intercomparison, Lawrence Livermore National Laboratory, 7000 East Avenue, Livermore, CA 94550, United States
推荐引用方式 GB/T 7714	van Rensch P.,Arblaster J.,Gallant A.J.E.,et al. Mechanisms causing east Australian spring rainfall differences between three strong El Niño events[J],2019,53(2020-05-06).
APA	van Rensch P.,Arblaster J.,Gallant A.J.E.,Cai W.,Nicholls N.,&Durack P.J..(2019).Mechanisms causing east Australian spring rainfall differences between three strong El Niño events.Climate Dynamics,53(2020-05-06).
MLA	van Rensch P.,et al."Mechanisms causing east Australian spring rainfall differences between three strong El Niño events".Climate Dynamics 53.2020-05-06(2019).