More extreme-heat occurrences related to humidity in China

IF 2.3 4区 地球科学 Q3 METEOROLOGY & ATMOSPHERIC SCIENCES Atmospheric and Oceanic Science Letters Pub Date : 2023-09-01 DOI:10.1016/j.aosl.2023.100391
Wenyue He , Huopo Chen
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引用次数: 1

Abstract

The co-occurrence of day and night compound heat extremes has attracted much attention because of the amplified socioeconomic and human health impacts. Based on ERA5 hourly reanalysis data, this study characterized and compared extreme day–night compound humid-heat/high-temperature events (CHHEs/CHTEs) in China as well as the associated impacts. Results indicated that the spatial patterns of summer mean extreme CHHEs are consistent with those of extreme CHTEs, except in northwestern China. A greater magnitude of these two types of events dominates over southern China, but the high-frequency centers are mainly observed over northern China. Significant increasing trends in frequency are captured nationwide, but with much stronger trends detected in northern and western China. Further analysis shows that the anomalies of humidity play a more important role than those of temperature in the occurrence of extreme CHHEs in most parts of China, but particularly in eastern regions. Since 1961, the human population and land areas of China have experienced strongly increasing compound heat extremes, with a faster rate of exposure to extreme CHHEs than to extreme CHTEs. This study highlights the importance of understanding regional changes in humidity when considering heat stress in the future.

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中国与湿度有关的极端高温事件增多
由于对社会经济和人类健康影响的放大,昼夜复合极端高温的共同发生引起了人们的广泛关注。基于ERA5逐时再分析数据,本研究对中国极端昼夜复合湿热高温事件(CHHEs/CHTEs)及其影响进行了表征和比较。结果表明,除西北地区外,夏季平均极端chhs与极端CHTEs的空间格局基本一致。这两类事件的震级较大的地区主要在中国南方,但高频中心主要在中国北方。在全国范围内发现了频率显著增加的趋势,但在中国北部和西部发现了更强的趋势。进一步分析表明,湿度异常在中国大部分地区,特别是东部地区的极端chhs发生中起着比温度异常更重要的作用。自1961年以来,中国人口和土地面积经历了强烈增加的复合极端高温,极端chhs暴露率高于极端CHTEs暴露率。这项研究强调了在考虑未来热应激时了解湿度区域变化的重要性。
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来源期刊
Atmospheric and Oceanic Science Letters
Atmospheric and Oceanic Science Letters METEOROLOGY & ATMOSPHERIC SCIENCES-
CiteScore
4.20
自引率
8.70%
发文量
925
审稿时长
12 weeks
期刊最新文献
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