气候变化领域集成服务门户(CCPortal): The anomalous 2017 coastal El Niño event in Peru

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DOI	10.1007/s00382-018-4466-y
	The anomalous 2017 coastal El Niño event in Peru
	Rodríguez-Morata C.; Díaz H.F.; Ballesteros-Canovas J.A.; Rohrer M.; Stoffel M.
发表日期	2019
ISSN	0930-7575
起始页码	5605
结束页码	5622
卷号	52 期号:2020-09-10
英文摘要	Remarkably heavy and devastating rainfalls affected large parts of Peru during the austral summer 2016–2017. These rainfalls favoured widespread land sliding and extensive flooding and generated one of the most severe disasters of Peru since the 1997–1998 El Niño event. The amount of rainfall recorded between January and March 2017 only compares to the biggest El Niño events of the last 40 years (i.e. 1982–1983 and 1997–1998) and exceeded the 90th percentile of available records (1981–2017) over much of the northern and central coasts of Peru, the Andean region and Amazonia. The occurrence of these heavy rainfalls was highly anomalous as it occurred during the first austral summer following the development and decay of a very strong El Niño in 2015–2016. Here, we propose that the likely cause of the anomalous rainfalls is linked to the combination of an especially intense wet spell over the Central Andes related to a deep, long-lasting anticyclone located adjacent to the Chilean coast, and to the unusual development of warm water off the coast of Peru in the nominal El Niño 1 + 2 region. This warming has been related to an anomalous weakening of the mid-upper level subtropical westerly flow, which in turn led to a weakening of the southeasterly trades off the coast, thus hindering the upwelling near the Peruvian coast and favoring the eastern Pacific warming. This development is counter to the usual evolution of sea surface temperature in the eastern equatorial Pacific following very strong El Niño events, such as those occurred in 1982–1983, 1997–1998, and 2015–2016. This paper explores the unusual nature of this event in the observational record and illustrates its consequences. © 2018, Springer-Verlag GmbH Germany, part of Springer Nature.
英文关键词	Coastal El Niño; Flooding; Peru; Rainfalls; Sea surface temperature
语种	英语
scopus关键词	anomaly; coastal zone; El Nino; flooding; rainfall; sea surface temperature; summer; Amazonia; Andes; Peru
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/146344
作者单位	Climate Change Impacts and Risks in the Anthropocene (C-CIA), Institute for Environmental Sciences, University of Geneva, Boulevard Carl-Vogt 66, Geneva, 1205, Switzerland; Department of Geography and Environment, University of Hawai‘i at Manoa, Honolulu, United States; Dendrolab.ch, Department of Earth Sciences, University of Geneva, Rue des Maraîchers 13, Geneva, 1205, Switzerland; Meteodat GmbH, Technoparkstrasse 1, Zurich, 8005, Switzerland; Department F.A. Forel for Aquatic and Environmental Sciences, University of Geneva, Boulevard Carl-Vogt 66, Geneva, 1205, Switzerland
推荐引用方式 GB/T 7714	Rodríguez-Morata C.,Díaz H.F.,Ballesteros-Canovas J.A.,et al. The anomalous 2017 coastal El Niño event in Peru[J],2019,52(2020-09-10).
APA	Rodríguez-Morata C.,Díaz H.F.,Ballesteros-Canovas J.A.,Rohrer M.,&Stoffel M..(2019).The anomalous 2017 coastal El Niño event in Peru.Climate Dynamics,52(2020-09-10).
MLA	Rodríguez-Morata C.,et al."The anomalous 2017 coastal El Niño event in Peru".Climate Dynamics 52.2020-09-10(2019).