中国大陆复合热浪及其与城市热岛的相互作用

IF 8.2 1区 地球科学 Q1 ENVIRONMENTAL SCIENCES
Earths Future Pub Date : 2025-08-13 DOI:10.1029/2025EF006490
Liwei Zhang, Weilin Liao, Xuan Chen, Shanjun Cheng, Jiachuan Yang
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引用次数: 0

摘要

短时复合热浪(CHWs),即两个连续的热浪(HWs)之间有一个间歇的凉爽中断,预计在全球变暖的情况下会更频繁地发生。然而,在大陆尺度上,它们的时空特征及其与城市热岛的相互作用尚未得到探索。利用中国2000多个地面站的观测数据,我们发现从1961年到2021年,chw构成的HW危害的比例越来越大。以日最低气温为热日,升温趋势尤为明显,表明夜间热环境恶化。城乡CHW趋势对比表明,城市化对城市(尤其是南方城市)CHW发生频率的增加有重要贡献。结果表明:在高温和高温条件下,平均热岛强度(UHII)有减弱的趋势,这与气压增加和降水减少有关;在CHW事件期间,由于降水作用下城市地区的蒸发冷却增强,UHII在冷歇期间减少。热岛热岛和高热量之间的相互作用随背景气候的变化而变化,在干旱地区为正,在潮湿地区为负。本研究提供了中国大陆CHW演变的见解,并证明了气候变化下热缓解策略的必要性。
本文章由计算机程序翻译,如有差异,请以英文原文为准。

Temporally Compound Heatwave and Its Interaction With Urban Heat Island Over Mainland China

Temporally Compound Heatwave and Its Interaction With Urban Heat Island Over Mainland China

Temporally Compound Heatwave and Its Interaction With Urban Heat Island Over Mainland China

Temporally Compound Heatwave and Its Interaction With Urban Heat Island Over Mainland China

Temporally compound heatwaves (CHWs), two consecutive heatwaves (HWs) with an intermittent cool break between them, are projected to occur more frequently under a warming globe. However, their spatiotemporal characteristics and interaction with urban heat island (UHI) are unexplored at the continental scale. Using observational data from over 2000 ground-based stations over China, we find that CHWs constitute an increasing portion of HW hazard from 1961 to 2021. The increasing trend is especially evident when using the daily minimum temperature to define hot days, suggesting an aggravated thermal environment at night. Urban-rural contrast of CHW trends illustrates that urbanization contributes substantially to the increased frequency of CHWs in cities, especially in southern China. Results show that mean UHI intensity (UHII) tends to weaken under HW and CHW conditions, which correlates with increased pressure and reduced precipitation. During CHW events, UHII reduces during cool break due to enhanced evaporative cooling in urban areas under precipitation. The interaction between UHI and HW is subject to change with background climate, which is positive for dry regions and negative for wet regions. This study provides insights into CHW evolution over mainland China and demonstrates the need for heat mitigation strategies under climate change.

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来源期刊
Earths Future
Earths Future ENVIRONMENTAL SCIENCESGEOSCIENCES, MULTIDI-GEOSCIENCES, MULTIDISCIPLINARY
CiteScore
11.00
自引率
7.30%
发文量
260
审稿时长
16 weeks
期刊介绍: Earth’s Future: A transdisciplinary open access journal, Earth’s Future focuses on the state of the Earth and the prediction of the planet’s future. By publishing peer-reviewed articles as well as editorials, essays, reviews, and commentaries, this journal will be the preeminent scholarly resource on the Anthropocene. It will also help assess the risks and opportunities associated with environmental changes and challenges.
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