A Multivariate Flash Drought Indicator for Identifying Global Hotspots and Associated Climate Controls
A Multivariate Flash Drought Indicator for Identifying Global Hotspots and Associated Climate Controls
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DOI：
10.1029/2021gl096804
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发表时间：
2022-01
影响因子：
5.2
通讯作者：
S. Mukherjee;Anshuman Mishra
中科院分区：
文献类型：
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作者：
S. Mukherjee;Anshuman Mishra
突发干旱 (FD) 对社会的重大影响可能因 FD 特征（事件数量、平均严重程度和加剧率）的组合而异，而这在很大程度上尚未得到探索。我们利用 1980-2018 年的根区土壤湿度来计算 FD 特征，并将它们整合起来制定一个新的多元 FD 指标，用于绘制全球 FD 热点区域。研究了气候特征（即异常、干旱和蒸发分数）和陆地气候反馈对多元 FD 指标演化的潜在影响。我们的结果表明，降水是FD演变的主要驱动力，而事件发生后，温度、蒸气压赤字和陆地气候相互作用的影响在不同的气候分区中有所不同。多元 FD 指标的大小随着气候干旱的增加而降低，并且在全球潮湿的情况下很重要，强调了水和能源供应作为调节 FD 风险的限制因素的重要性。
The significant impact of flash droughts (FDs) on society can vary based on a combination of FD characteristics (event counts, mean severity, and rate of intensification), which is largely unexplored. We employed root‐zone soil‐moisture for 1980–2018 to calculate the FD characteristics and integrated them to formulate a novel multivariate FD indicator for mapping the global FD hotspot regions. The potential influence of climate characteristics (i.e., anomalies, aridity, and evaporative fractions) and land‐climate feedbacks on the evolution of multivariate FD indicator is investigated. Our results indicate that precipitation is the primary driver of FD evolution, while the effect of temperature, vapor pressure deficit, and land‐climate interaction varies across the climate divisions after the onset of the events. The magnitude of multivariate FD indicator decreases with increased climate aridity, and it is significant in the global humid regimes, underscoring the importance of water and energy supply as limiting factors regulating FD‐risk.