气候变化领域集成服务门户(CCPortal): Persistent Increases in Nighttime Heat Stress From Urban Expansion Despite Heat Island Mitigation

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DOI	10.1029/2020JD033831
	Persistent Increases in Nighttime Heat Stress From Urban Expansion Despite Heat Island Mitigation
	Huang K.; Lee X.; Stone B.; Jr.; Knievel J.; Bell M.L.; Seto K.C.
发表日期	2021
ISSN	2169897X
卷号	126 期号:4
英文摘要	Urban areas generally have higher near-surface air temperature and lower air humidity than rural areas. Little is known about how heat stress, the combined effect of high air temperature and high humidity on human physiology, will be affected by future urban land expansion. Here we use a mesoscale numerical weather prediction model to examine the effects of urban land expansion from 2000 to 2050 on heat stress (measured as wet-bulb globe temperature, WBGT) in the urban areas of China, India, and Nigeria, which are projected to account for one-third of global urban population growth through 2050. Our results show that urban expansion slightly reduces heat stress during the day (∼0.2°C) but substantially intensifies it at night, by ∼1°C on average and by up to 2–3°C in five mega-urban regions (MURs). These effects exist with or without climate change induced by rising concentrations of greenhouse gases (GHGs). Installing cool roofs—an urban heat island mitigation measures—can reduce the daytime WBGT by 0.5–1°C, partially offsetting the heat stress conditions caused by GHG-induced climate change. However, even with cool roofs, the nighttime WBGTs are higher by 0.3–0.9°C over the whole countries studied, and by 1–2°C in the MURs under the urban expansion scenario, compared to the situation in which urban areas remain unchanged. These results show that future urban expansion and heat island mitigation can result in potential daytime benefits but also persistent nighttime risks. © 2021. American Geophysical Union. All Rights Reserved.
英文关键词	heat stress; land change science; urban climate; urbanization
语种	英语
来源期刊	Journal of Geophysical Research: Atmospheres
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/185493
作者单位	School of the Environment, Yale University, New Haven, CT, United States; National Center for Atmospheric Research, Research Application Laboratory, Boulder, CO, United States; School of City and Regional Planning, Georgia Institute of Technology, Atlanta, GA, United States
推荐引用方式 GB/T 7714	Huang K.,Lee X.,Stone B.,et al. Persistent Increases in Nighttime Heat Stress From Urban Expansion Despite Heat Island Mitigation[J],2021,126(4).
APA	Huang K..,Lee X..,Stone B..,Jr..,Knievel J..,...&Seto K.C..(2021).Persistent Increases in Nighttime Heat Stress From Urban Expansion Despite Heat Island Mitigation.Journal of Geophysical Research: Atmospheres,126(4).
MLA	Huang K.,et al."Persistent Increases in Nighttime Heat Stress From Urban Expansion Despite Heat Island Mitigation".Journal of Geophysical Research: Atmospheres 126.4(2021).