气候变化领域集成服务门户(CCPortal): Atmospheric dynamics of extreme discharge events from 1979 to 2016 in the southern Central Andes

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DOI	10.1007/s00382-020-05458-1
	Atmospheric dynamics of extreme discharge events from 1979 to 2016 in the southern Central Andes
	Castino F.; Bookhagen B.; de la Torre A.
发表日期	2020
ISSN	0930-7575
起始页码	3485
结束页码	3505
卷号	55
英文摘要	During the South-American Monsoon season, deep convective systems occur at the eastern flank of the Central Andes leading to heavy rainfall and flooding. We investigate the large- and meso-scale atmospheric dynamics associated with extreme discharge events (> 99.9th percentile) observed in two major river catchments meridionally stretching from humid to semi-arid conditions in the southern Central Andes. Based on daily gauge time series and ERA-Interim reanalysis, we made the following three key observations: (1) for the period 1940–2016 daily discharge exhibits more pronounced variability in the southern, semi-arid than in the northern, humid catchments. This is due to a smaller ratio of discharge magnitudes between intermediate (0.2 year return period) and rare events (20 year return period) in the semi-arid compared to the humid areas; (2) The climatological composites of the 40 largest discharge events showed characteristic atmospheric features of cold surges based on 5-day time-lagged sequences of geopotential height at different levels in the troposphere; (3) A subjective classification revealed that 80% of the 40 largest discharge events are mainly associated with the north-northeastward migration of frontal systems and 2/3 of these are cold fronts, i.e. cold surges. This work highlights the importance of cold surges and their related atmospheric processes for the generation of heavy rainfall events and floods in the southern Central Andes. © 2020, The Author(s).
英文关键词	Cold surges; Daily-discharge time series ERA-interim; Extreme discharge; Mesoscale convective systems; Orographic barrier; South American monsoon system
语种	英语
scopus关键词	atmospheric dynamics; cold wave; convective system; extreme event; monsoon; orography; river discharge; time series analysis; Andes
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/145243
作者单位	Institute of Geosciences, University of Potsdam, Potsdam, Germany; Faculty of Engineering, LIDTUA, Austral University and CONICET, Pilar, Buenos Aires, Argentina
推荐引用方式 GB/T 7714	Castino F.,Bookhagen B.,de la Torre A.. Atmospheric dynamics of extreme discharge events from 1979 to 2016 in the southern Central Andes[J],2020,55.
APA	Castino F.,Bookhagen B.,&de la Torre A..(2020).Atmospheric dynamics of extreme discharge events from 1979 to 2016 in the southern Central Andes.Climate Dynamics,55.
MLA	Castino F.,et al."Atmospheric dynamics of extreme discharge events from 1979 to 2016 in the southern Central Andes".Climate Dynamics 55(2020).