Knowledge Resource Center for Ecological Environment in Arid Area
DOI | 10.1002/hyp.13596 |
Observed trends and relationships between ENSO and standardized hydrometeorological drought indices in central Chile | |
Oertel, Melanie1,2; Javier Meza, Francisco1,2,3; Gironas, Jorge1,4,5,6 | |
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. |
条目包含的文件 | 条目无相关文件。 |
除非特别说明,本系统中所有内容都受版权保护,并保留所有权利。