Increase in Compound Drought and Heatwaves in a Warming World

Increase in Compound Drought and Heatwaves in a Warming World
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世界变暖导致干旱和热浪复合增加

DOI:
10.1029/2020gl090617
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发表时间:
2021
影响因子:
5.2
通讯作者:
Mishra, Ashok Kumar
Mishra, Ashok Kumar
中科院分区:
地球科学1区
文献类型:
--
作者:
Mukherjee, Sourav;Mishra, Ashok Kumar

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复合干旱和热浪会对环境、经济和社会造成重大破坏。在这项研究中,我们通过积分1983年至2016年期间每周自校准的Palmer干旱严重程度指数(Sc_PDSI)和日最高气温来量化复合干旱和热浪(CDHW)事件的时空变化。在复合事件分析中,使用多个数据产品来检验sc_pdsi的稳健性。结果一致表明,在最近(变暖)期间,与干旱有关的热浪和受影响的全球陆地面积显著增加。全球几个地区的CDHW频率(每年1至3次)、持续时间(2至10天/年)和严重程度都有所上升。这种增长模式在空间上是不对称的,由于最近的变暖,整个北半球都观察到了更大的放大。此外,背景干燥度还影响CDHW事件的时空演化。研究结果可用于最大限度地减少极端CDHW对关键地理区域的影响。
Compound drought and heatwaves can cause significant damage to the environment, economy, and society. In this study, we quantify the spatio‐temporal changes in compound drought and heatwave (CDHW) events by integrating weekly self‐calibrated Palmer Drought Severity Index (sc_PDSI) and daily maximum temperatures during the period 1983 to 2016. Multiple data products are used to examine the robustness of sc_PDSI in the compound event analysis. The results consistently suggest significant increases in drought‐related heatwaves and affected global land area in recent (warmer) periods. Several regions across the globe witnessed rise in CDHW frequency (one to three events/year), duration (2–10 days/year), and severity. This increasing pattern is spatially asymmetric, and greater amplification is observed across the Northern hemisphere due to recent warming. Furthermore, the background aridity influences the spatiotemporal evolution of CDHW events. The results can be applied to minimize the impacts of extreme CDHWs in critical geographical regions.
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