气候变化领域集成服务门户(CCPortal): Characterisation of hydrological droughts in central-north Argentina and their atmospheric and oceanic drivers

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DOI	10.3354/cr01593
	Characterisation of hydrological droughts in central-north Argentina and their atmospheric and oceanic drivers
	Caragunis J.I.; Rivera J.A.; Penalba O.C.
发表日期	2020
ISSN	0936-577X
起始页码	1
结束页码	18
卷号	80 期号:1
英文摘要	Low streamflows caused by natural and anthropogenic forcings affect ecosystems and societies, especially on large timescales. We analysed the main basins of central-north Argentina (CNA) using centennial streamflow data. This study is focussed on describing spatial and temporal variability of hydrological drought events, and evaluating the atmospheric and oceanic drivers under hydrological drought conditions. The Standardized Streamflow Index in the period 1919−2014 was applied, sectored by 4 major basins. The western Argentinian rivers (Colorado Basin, CB) have shown increasing drought events since the 1940 decade, while in the east, a sharp decrease occurred from 1970 onwards. Extreme drought events occurred over CB and La Plata Basin (LPB) during the periods 1966−1972 and 2010−2014. Atmospheric and oceanic patterns under hydrological drought conditions show anticyclonic anomalies over the South Pacific Ocean (SPO), cyclonic sub-polar anomalies and La Niña-like conditions with warm sea surface temperature anomalies (SSTAs) in SPO for the western basins. Over LPB, a strong cold SSTA in the tropical south-western Atlantic Ocean is positioned in phase with the cyclonic anomalies. At mid-latitudes, a warm SSTA and anticyclonic anomalies are detected. Water vapour transport composites show southerly winds and drier conditions for northern and eastern Argentina, and weakening of westerly winds with drier atmosphere for western rivers. These results deepen our knowledge of natural forcings related to hydrological drought events in CNA and in the predictability of such complex natural hazards. © Inter-Research 2020. www.int-res.com
英文关键词	Argentina; Atmosphere−oceanic drivers; Hydrological drought; Streamflow
语种	英语
scopus关键词	air-sea interaction; anticyclone; atmosphere-ocean coupling; drought; index method; La Nina; sea surface temperature; spatiotemporal analysis; temperature anomaly; westerly; Argentina; Atlantic Ocean; Atlantic Ocean (Southwest); Colorado Basin [North America]; La Plata Basin; Pacific Ocean; Pacific Ocean (South)
来源期刊	Climate Research
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/146875
作者单位	Departamento de Ciencias de la Atmósfera y los Océanos, Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires, Intendente Güiraldes 2160, Pabellón 2, 2° Piso − Ciudad Universitaria, Buenos Aires, C1428EGA, Argentina; Instituto Argentino de Nivología, Glaciología y Ciencias Ambientales (CCT-Mendoza/CONICET), Av. Ruiz Leal s/n, Parque General San Martín, Mendoza, 5500, Argentina; Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET), Av. Rivadavia 1917, Buenos Aires, C1033AAJ, Argentina
推荐引用方式 GB/T 7714	Caragunis J.I.,Rivera J.A.,Penalba O.C.. Characterisation of hydrological droughts in central-north Argentina and their atmospheric and oceanic drivers[J],2020,80(1).
APA	Caragunis J.I.,Rivera J.A.,&Penalba O.C..(2020).Characterisation of hydrological droughts in central-north Argentina and their atmospheric and oceanic drivers.Climate Research,80(1).
MLA	Caragunis J.I.,et al."Characterisation of hydrological droughts in central-north Argentina and their atmospheric and oceanic drivers".Climate Research 80.1(2020).