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DOI	10.1007/s00382-019-04838-6
	Intraseasonal and low frequency processes contributing to the December 2013 heat wave in Southern South America
	Alvarez M.S.; Cerne B.; Osman M.; Vera C.S.
发表日期	2019
ISSN	0930-7575
起始页码	4977
结束页码	4988
卷号	53 期号:2020-07-08
英文摘要	In the second fortnight of December 2013, the longest heat wave registered until then occurred in Buenos Aires city and over a large region of Argentina, with large socio-economic impacts. Excess heat indexes were used to characterize this heat wave, which occurred within the warm season with largest number of heat wave days. This extreme event resulted in the longest consecutive period of heat wave conditions between 1979 and 2014. This event was the result of the combined activity of short intraseasonal (10–30 days), long intraseasonal (30–90 days) and larger (more than 90 days) time scales. Accounting for the lower frequency, dry soil moisture anomalies were observed in Argentina during autumn, winter and spring of 2013 probably favoring more extreme values in the temperature anomalies. Weekly geopotential heights anomalies computed during the event showed that the combination of the negative phase of the Southern Annular Mode and a wave-4 pattern at midlatitudes favored the development of positive geopotential height anomalies over southern South America which promoted subsidence motions there. Intraseasonal variability played a key role in the persistence of the heat wave. The development of an MJO event over the Indian Ocean (RMM phase 3) 12 days prior to the beginning of the heat wave may have contributed to organize the extratropical wave train which in turn favored the anticyclonic upper-level anomaly development over southern South America. Furthermore, an intense SACZ event during the first 12 days of the heat wave favored clear-sky conditions and diabatic heating as well as subsidence, while during the last days it was the northerly advection of warmer air in the 10–30-day time scale that maintained the intensity of the temperature anomalies. © 2019, Springer-Verlag GmbH Germany, part of Springer Nature.
英文关键词	Heat wave; Intraseasonal variability; Soil moisture; South America
语种	英语
scopus关键词	geopotential; heat wave; seasonal variation; socioeconomic impact; soil moisture; subsidence; temperature anomaly; Argentina; Buenos Aires [Federal District]; Federal District [Argentina]
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/145946
作者单位	Departamento de Ciencias de la Atmósfera y los Océanos, Facultad de Ciencias Exactas y Naturales (DCAO/FCEN), Universidad de Buenos Aires (UBA), Buenos Aires, Argentina; Centro de Investigaciones del Mar y la Atmósfera (CIMA), Universidad de Buenos Aires-Consejo Nacional de Investigaciones Científicas y Técnicas (UBA-CONICET), Buenos Aires, Argentina; Institut Franco-Argentin d’Estudes sur le Climat et ses Impacts, Unité Mixte Internationale (UMI-IFAECI/CNRS-CONICET-UBA), Buenos Aires, Argentina
推荐引用方式 GB/T 7714	Alvarez M.S.,Cerne B.,Osman M.,et al. Intraseasonal and low frequency processes contributing to the December 2013 heat wave in Southern South America[J],2019,53(2020-07-08).
APA	Alvarez M.S.,Cerne B.,Osman M.,&Vera C.S..(2019).Intraseasonal and low frequency processes contributing to the December 2013 heat wave in Southern South America.Climate Dynamics,53(2020-07-08).
MLA	Alvarez M.S.,et al."Intraseasonal and low frequency processes contributing to the December 2013 heat wave in Southern South America".Climate Dynamics 53.2020-07-08(2019).