Amplified intensity and duration of heatwaves by concurrent droughts in China
Amplified intensity and duration of heatwaves by concurrent droughts in China
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DOI：
10.1016/j.atmosres.2021.105743
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发表时间：
2021-10
影响因子：
5.5
通讯作者：
Zitong Shi;G. Jia;Yuyu Zhou;Xiyan Xu;Ying Jiang
中科院分区：
文献类型：
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作者：
Zitong Shi;G. Jia;Yuyu Zhou;Xiyan Xu;Ying Jiang
与单个事件相比，复合干热气候极端事件可能导致更严重的自然灾害和社会经济影响。需要更好地了解历史上的热浪-干旱复合物及其与热浪本身的差异，以便更好地预测气候变化下极端事件的发生和影响。利用1980-2017年中国2000多个站点的气象资料，研究了热浪-干旱复合的时空变化，并将热浪-干旱复合与单独热浪的热浪强度和持续时间进行了比较。在1980-2017年期间，热浪干旱化合物的年发生率显著增加。在全国范围内，热浪-干旱复合体的热浪强度为34.24 °C ± 4.39 °C，高于单独热浪的33.33 °C ± 4.35 °C。持续时间>7 d的高温天气在高温干旱复合天气中占34.42%~ 50.70%，而在高温天气中仅占11.82%~ 21.55%。通过对中国热浪干旱复合体和热浪单独体的定量评价，发现热浪干旱复合体与热浪单独体相比，热浪强度和持续时间均有所放大。
Compound hot-dry climate extremes could lead to severer natural disasters and socio-economic impacts compared to individual events. An improved understanding of historical heatwave-drought compounds and their differences compared to heatwaves alone is needed for better predicting the occurrence and impacts of extremes under a changing climate. In this study, we investigated spatiotemporal variations of heatwave-drought compounds using meteorological data from more than 2000 stations in China during 1980–2017, and compared the heatwave intensity and duration in heatwave-drought compounds with that in heatwaves alone. The annual occurrence of heatwave-drought compounds increased significantly during 1980–2017. At the national level, heatwave intensity in heatwave-drought compounds was 34.24 °C ± 4.39 °C, which was higher than that in heatwaves alone of 33.33 °C ± 4.35 °C. The occurrence of long-lasting (duration >7 days) heatwaves accounted for about 34.42% - 50.70% in heatwave-drought compounds, while this ratio was only 11.82% -21.55% in heatwaves alone. The quantitative evaluation of heatwave-drought compounds and heatwaves alone in China highlighted the amplified heatwave severity and duration in heatwave-drought compounds versus that in heatwaves alone.