干旱区生态环境知识资源中心(Arid): Observed trends and relationships between ENSO and standardized hydrometeorological drought indices in central Chile

Arid

DOI	10.1002/hyp.13596
	Observed trends and relationships between ENSO and standardized hydrometeorological drought indices in central Chile
	Oertel, Melanie 1,2; Javier Meza, Francisco 1,2,3; Gironas, Jorge 1,4,5,6
通讯作者	Javier Meza, Francisco
来源期刊	HYDROLOGICAL PROCESSES
ISSN	0885-6087
EISSN	1099-1085
出版年	2020
卷号	34 期号:2 页码:159-174
英文摘要	Droughts are natural phenomena that severely affect socio economic and ecological systems. In Chile, population and economic activities are highly concentrated in its central region (i.e. between latitudes 29 degrees S and 40 degrees S), which periodically suffers from severe droughts affecting agriculture, hydropower, and mining. Understanding the dynamics of droughts and large-scale atmospheric processes that influence the occurrence of dry spells is essential for forecasting and efficient early detection of drought events. Central Chile's climate is marked by a significant El Nino Southern Oscillation (ENSO) influence that might help to better characterize droughts as well as to identify the effects of ENSO on the spatial and temporal characteristics of meteorological and hydrological droughts in the region. We analysed the behaviour of the Standardized Precipitation Evapotranspiration Index (SPEI) and Standardized Streamflow Index (SSI) time series for 6-month accumulation periods over the austral winter and summer seasons. Multiple linear regression (MLR) and Generalized Linear Models (GLM) showed a significant ENSO influence on dry events for SPEI-6 and SSI-6 during winter and summer. We found that the magnitude of correlation between ENSO and SPEI-6 has changed over the last decades becoming weaker in winter periods and increasing in spring summer periods. Increasing trends in meteorological and hydrological drought events were also identified, along all latitudes, with significant trends during winter in the southern latitudes, and during summer in the semi-arid and Mediterranean zones. These results indicate that drought mitigation actions and policies are necessary to overcome their adverse effects. Given the monthly persistence of ENSO and its relationship to drought indices, there are opportunities for drought monitoring and seasonal forecasting that could become part of national drought management systems.
英文关键词	Central Chile drought trends El Nino Southern Oscillation standardized drought indices
类型	Article
语种	英语
国家	Chile
收录类别	SCI-E
WOS记录号	WOS:000497329500001
WOS关键词	SOUTHERN-OSCILLATION ; PRECIPITATION INDEX ; VARIABILITY ; EVENTS ; NORTH ; HYDROCLIMATE ; MEGADROUGHT ; CHALLENGES ; ARGENTINA ; PATTERNS
WOS类目	Water Resources
WOS研究方向	Water Resources
EI主题词	2019-11-20
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/310937
作者单位	1.Pontificia Univ Catolica Chile, Ctr Interdisciplinario Cambio Global, Santiago, Chile; 2.Pontificia Univ Catolica Chile, Dept Ecosistemas & Medio Ambiente, Santiago, Chile; 3.Aquasec, IAI Ctr Excellence forWater Secur, Santiago, Chile; 4.Pontificia Univ Catolica Chile, Dept Ingn Hidraul & Ambiental, Santiago, Chile; 5.CEDEUS CONICYT FONDAP 15110020, Ctr Desarrollo Urbano Sustentable, Santiago, Chile; 6.CIGIDEN CONICYT FONDAP 15110017, Ctr Invest Gest Integrada Desastres Nat, Santiago, Chile
推荐引用方式 GB/T 7714	Oertel, Melanie,Javier Meza, Francisco,Gironas, Jorge. Observed trends and relationships between ENSO and standardized hydrometeorological drought indices in central Chile[J],2020,34(2):159-174.
APA	Oertel, Melanie,Javier Meza, Francisco,&Gironas, Jorge.(2020).Observed trends and relationships between ENSO and standardized hydrometeorological drought indices in central Chile.HYDROLOGICAL PROCESSES,34(2),159-174.
MLA	Oertel, Melanie,et al."Observed trends and relationships between ENSO and standardized hydrometeorological drought indices in central Chile".HYDROLOGICAL PROCESSES 34.2(2020):159-174.