Spatiotemporal Evolution of Heat Wave Severity and Coverage Across the United States
Spatiotemporal Evolution of Heat Wave Severity and Coverage Across the United States
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DOI：
10.1029/2020gl087097
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发表时间：
2020-04
影响因子：
5.2
通讯作者：
D. Keellings;H. Moradkhani
中科院分区：
文献类型：
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作者：
D. Keellings;H. Moradkhani
热浪对人类健康、生态系统和社会都有明显的影响。全球范围内的热浪变得更加频繁和强烈，并可能在气候变暖的情况下进一步加剧。在整个美国，平均地表温度有变暖的趋势，但热浪严重程度似乎没有一致的增加。热浪研究的局限性可能是导致热浪变暖信号检测有限的原因。我们跟踪每天的时空演变的热浪，使用几何概念和聚类算法来研究如何热体现在陆地表面上。我们开发了一个空间度量相结合的热浪频率，幅度，持续时间和面积范围。我们发现1981-2018年期间美国各地的一些个别热浪特征存在混合趋势。然而，结合热浪特征的时空演变的探索显示，在此期间相当大的增加，并表明在美国各地的热浪危害大幅增加。
Heat waves have pronounced impacts on human health, ecosystems, and society. Heat waves have become more frequent and intense globally and are likely to intensify further in a warming climate. Across the United States there is a warming trend in average surface temperatures, but concordant increase in heat wave severity appears absent. Limitations in heat waves studies may be responsible for limited detection of a heat wave warming signal. We track daily spatiotemporal evolution of heat waves using geometric concepts and clustering algorithms to investigate how heat manifests on the land surface. We develop a spatial metric combining heat wave frequency, magnitude, duration, and areal extent. We find mixed trends in some individual heat wave characteristics across the United States during 1981–2018. However, exploration of the spatiotemporal evolution of combined heat wave characteristics shows considerable increases during this period and indicates a substantial increase in heat wave hazard across the United States.