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Linking drought propagation with episodes of climate-Induced water insecurity in Pernambuco state - Northeast Brazil
Journal of Arid Environments ( IF 2.6 ) Pub Date : 2021-07-20 , DOI: 10.1016/j.jaridenv.2021.104593
Tiago de Morais Inocêncio 1 , Alfredo Ribeiro Neto 1 , Melanie Oertel 2, 3 , Francisco Javier Meza 2, 3 , Christopher A. Scott 4, 5
Affiliation  

The semiarid region of Northeast Brazil is characterized by recurrent drought episodes. The magnitude of drought events may be assessed using standardized climate indices (SCIs) based on hydrometeorological variables, including precipitation, evapotranspiration, soil moisture, and streamflow. Drought monitoring may be improved using the concept of drought propagation, which considers the existing link between different types of droughts. Thus, correlations between the SCIs can be used to identify propagation patterns and, subsequently, predict the magnitude of a drought occurring after the first identification of a meteorological drought. In this study, five river basins located in the Pernambuco state in Northeast Brazil were selected for SCI application. The results showed that drought duration plays an important role in the final value of the SCI. Further, events between 2012 and 2017 had more severe SSMI (Standardized Soil Moisture Index) and SSI (Standardized Streamflow Index) values than SPI (Standardized Precipitation Index) and SPEI (Standardized Precipitation Evapotranspiration Index). Thus, the SPI alone may not be able to properly detect the magnitude of some droughts. The results of this study show the potential of the SCIs for monitoring systems and how information of soil moisture and streamflow, besides precipitation, can be useful for drought preparedness.



中文翻译:

将干旱传播与巴西东北部伯南布哥州气候导致的水不安全事件联系起来

巴西东北部半干旱地区的特点是反复发生干旱。干旱事件的严重程度可以使用基于水文气象变量的标准化气候指数 (SCI) 进行评估,这些变量包括降水、蒸发量、土壤水分和流量。使用干旱传播的概念可以改进干旱监测,该概念考虑了不同类型干旱之间的现有联系。因此,SCI 之间的相关性可用于确定传播模式,并随后预测首次确定气象干旱后发生的干旱程度。在这项研究中,位于巴西东北部伯南布哥州的五个流域被选择用于 SCI 应用。结果表明,干旱持续时间在 SCI 的最终值中起着重要作用。此外,与 SPI(标准化降水指数)和 SPEI(标准化降水蒸散指数)相比,2012 年至 2017 年之间的事件具有更严重的 SSMI(标准化土壤水分指数)和 SSI(标准化水流指数)值。因此,单独的 SPI 可能无法正确检测某些干旱的严重程度。这项研究的结果显示了 SCI 在监测系统方面的潜力,以及除降水之外的土壤水分和水流信息如何对干旱准备有用。2012 年至 2017 年之间的事件具有比 SPI(标准化降水指数)和 SPEI(标准化降水蒸散指数)更严重的 SSMI(标准化土壤水分指数)和 SSI(标准化水流指数)值。因此,单独的 SPI 可能无法正确检测某些干旱的严重程度。这项研究的结果显示了 SCI 在监测系统方面的潜力,以及除降水之外的土壤水分和水流信息如何对干旱准备有用。2012 年至 2017 年之间的事件具有比 SPI(标准化降水指数)和 SPEI(标准化降水蒸散指数)更严重的 SSMI(标准化土壤水分指数)和 SSI(标准化水流指数)值。因此,单独的 SPI 可能无法正确检测某些干旱的严重程度。这项研究的结果显示了 SCI 在监测系统方面的潜力,以及除降水之外的土壤水分和水流信息如何对干旱准备有用。

更新日期:2021-07-20
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