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DOI	10.1016/j.atmosres.2019.104792
	On the behavior of rainfall maxima at the eastern Andes
	Hierro R.; Burgos Fonseca Y.; Ramezani Ziarani M.; Llamedo P.; Schmidt T.; de la Torre A.; Alexander P.
发表日期	2020
ISSN	0169-8095
卷号	234
英文摘要	In this study, we detect high percentile rainfall events in the eastern central Andes, based on Tropical Rainfall Measuring Mission (TRMM) with a spatial resolution of 0.25 × 0.25°, a temporal resolution of 3 h, and for the duration from 2001 to 2018. We identify three areas with high mean accumulated rainfall and analyze their atmospheric behaviour and rainfall characteristics with specific focus on extreme events. Extreme events are defined by events above the 95th percentile of their daily mean accumulated rainfall. Austral summer (DJF) is the period of the year presenting the most frequent extreme events over these three regions. Daily statistics show that the spatial maxima, as well as their associated extreme events, are produced during the night. For the considered period, ERA-Interim reanalysis data, provided by the European Centre for Medium-Range Weather Forecasts (ECMWF) with 0.75° x0.75° spatial and 6-hourly temporal resolutions, were used for the analysis of the meso- and synoptic-scale atmospheric patterns. Night- and day-time differences indicate a nocturnal overload of northerly and northeasterly low-level humidity flows arriving from tropical South America. Under these conditions, cooling descending air from the mountains may find unstable air at the surface, giving place to the development of strong local convection. Another possible mechanism is presented here: a forced ascent of the low-level flow due to the mountains, disrupting the atmospheric stratification and generating vertical displacement of air trajectories. A Principal Component Analysis (PCA) in T-mode is applied to day- and night-time data during the maximum and extreme events. The results show strong correlation areas over each subregion under study during night-time, whereas during day-time no defined patterns are found. This confirms the observed nocturnal behavior of rainfall within these three hotspots. © 2019 Elsevier B.V.
学科领域	Atmospheric humidity; Atmospheric movements; Principal component analysis; Rain; Tropics; Weather forecasting; Accumulated rainfall; Atmospheric pattern; Atmospheric stratification; European centre for medium-range weather forecasts; Possible mechanisms; Rainfall characteristics; Tropical rainfall measuring missions; Vertical displacements; Rain gages; extreme event; precipitation assessment; precipitation intensity; principal component analysis; spatial resolution; spatiotemporal analysis; Andes
语种	英语
scopus关键词	Atmospheric humidity; Atmospheric movements; Principal component analysis; Rain; Tropics; Weather forecasting; Accumulated rainfall; Atmospheric pattern; Atmospheric stratification; European centre for medium-range weather forecasts; Possible mechanisms; Rainfall characteristics; Tropical rainfall measuring missions; Vertical displacements; Rain gages; extreme event; precipitation assessment; precipitation intensity; principal component analysis; spatial resolution; spatiotemporal analysis; Andes
来源期刊	Atmospheric Research
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/120515
作者单位	CONICET/Facultad de Ingeniería, Universidad Austral, LIDTUA (CIC), Argentina; Institute of Geosciences, University of Potsdam, Potsdam, Germany; Helmholtz Centre Potsdam, GFZ German Research Centre for Geosciences, Potsdam, Germany; CONICET/Instituto de Física de Buenos Aires (IFIBA), Buenos Aires, Argentina
推荐引用方式 GB/T 7714	Hierro R.,Burgos Fonseca Y.,Ramezani Ziarani M.,et al. On the behavior of rainfall maxima at the eastern Andes[J],2020,234.
APA	Hierro R..,Burgos Fonseca Y..,Ramezani Ziarani M..,Llamedo P..,Schmidt T..,...&Alexander P..(2020).On the behavior of rainfall maxima at the eastern Andes.Atmospheric Research,234.
MLA	Hierro R.,et al."On the behavior of rainfall maxima at the eastern Andes".Atmospheric Research 234(2020).