Issue |
E3S Web Conf.
Volume 490, 2024
5th International Symposium on Architecture Research Frontiers and Ecological Environment (ARFEE 2023)
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Article Number | 03001 | |
Number of page(s) | 7 | |
Section | Ecological Environment Restoration and Pollution Control | |
DOI | https://doi.org/10.1051/e3sconf/202449003001 | |
Published online | 14 February 2024 |
Impact of Urbanization on Global and Regional Humid Heat and Population Humid Heat Exposure
Shanghai Pinghe School, Shanghai, China
highschool_research@outlook.com
Extreme heat events pose great threats to public health and socioeconomic development, particularly in cities where the urban heat island (UHI) effect can exacerbate heat stress. The heat stress can be assessed by various heat indexes that vary in their weightings of air temperature and humidity. Utilizing the data from a global climate model, this study investigates the spatiotemporal pattern of the urban humid heat island measured by wet-bulb temperature (Tw), Humidex, and Heat Index (HI) and assesses its effect on the number of heat stressed days and the population humid heat exposure. Different heat indexes generate distinct spatiotemporal patterns of urban humid heat island and result in various number of additional heat-stressed days in cities, with the largest disparities observed in arid regions. The urban effect decreases the number of heat-stressed days in arid climate by 0.5 days when measured by Tw but Humidex and HI show an increase. This discrepancy arises from the differing reliance of these indexes on air temperature and humidity, with wet-bulb temperature exhibiting a greater dependence on humidity and HI showing the greatest sensitivity to air temperature. After accounting for the urbanization effect, the global population exposure to humid heat measured by Tw, Humidex, and HI increase by 11.2%, 46.4%, 72.1%, respectively. We highlight that it is crucial to exercise caution when interpreting assessment of humid heat using different heat indexes due to disparities in their spatial patterns of the urban humid heat island.
© The Authors, published by EDP Sciences, 2024
This is an Open Access article distributed under the terms of the Creative Commons Attribution License 4.0, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
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