Characteristics and trends of flash droughts in Spain, 1961–2018,Annals of the New York Academy of Sciences

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Characteristics and trends of flash droughts in Spain, 1961–2018
Annals of the New York Academy of Sciences ( IF 4.1 ) Pub Date : 2020-05-14 , DOI: 10.1111/nyas.14365
Iván Noguera ₁ , Fernando Domínguez-Castro _{2,

3} , Sergio M Vicente-Serrano ₁

Affiliation

Flash droughts are characterized by rapid onset and intensification, as well as major environmental and agricultural impacts. In this study, we developed an objective method for identifying flash droughts using the standardized evaporation precipitation index (SPEI) based on a short time scale (1‐month) and high‐frequency data (weekly). The identification of flash droughts was focused on the development phase, anomalous decreases in index values in a short time period (4 weeks), and the magnitude of the events. The method was applied to mainland Spain and the Balearic Islands using a high spatial resolution gridded dataset for the period 1961–2018. For this period of 58 years, we characterized the occurrence of flash droughts and showed that for Spain, there was a large spatial and temporal variability in their frequency, with more occurring in the northwest than in the central and southern regions. The northern regions, where a higher frequency of flash droughts was found, showed negative trends in the frequency of flash droughts, while the regions subject to fewer flash drought events showed generally positive trends. We investigated the relative frequency of flash droughts affecting the study regions and found that they are a common phenomenon, as 40% of all droughts were characterized by rapid development. The findings of this study have important implications for drought assessment, monitoring, and mitigation.

中文翻译：

1961-2018 年西班牙突发干旱的特征和趋势

突发干旱的特点是迅速发生和加剧，以及对环境和农业产生重大影响。在本研究中，我们开发了一种基于短时间尺度（1 个月）和高频数据（每周）的标准化蒸发降水指数 (SPEI) 来识别突发干旱的客观方法。对突发干旱的识别集中在发展阶段、短期内（4 周）指数值的异常下降以及事件的严重程度。该方法使用 1961-2018 年期间的高空间分辨率网格数据集应用于西班牙大陆和巴利阿里群岛。在这 58 年的这段时间里，我们描述了突发干旱的发生情况，并表明西班牙的频率存在很大的时空变异性，西北地区多于中南部地区。北方地区突发干旱发生频率较高，突发干旱发生频率呈负趋势，而突发干旱事件较少的地区总体呈正趋势。我们调查了影响研究区域的突发干旱的相对频率，发现它们是一种普遍现象，因为 40% 的干旱具有快速发展的特点。这项研究的结果对干旱评估、监测和减缓具有重要意义。而遭受突发干旱事件较少的地区总体上呈现出积极的趋势。我们调查了影响研究区域的突发干旱的相对频率，发现它们是一种普遍现象，因为 40% 的干旱具有快速发展的特点。这项研究的结果对干旱评估、监测和减缓具有重要意义。而遭受突发干旱事件较少的地区总体上呈现出积极的趋势。我们调查了影响研究区域的突发干旱的相对频率，发现它们是一种普遍现象，因为 40% 的干旱具有快速发展的特点。这项研究的结果对干旱评估、监测和减缓具有重要意义。

更新日期：2020-05-14

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