Characterizing Temporal Dynamics of Urban Heat Island in a Rapidly Expanding City: A 39 Years Study in Zhengzhou, China

• Published in: Land (Basel) Vol. 11; no. 10; p. 1838
• Main Authors: Li, Huawei, Jombach, Sandor, Tian, Guohang, Li, Yuanzheng, Meng, Handong
• Format: Journal Article
• Language: English
• Published: Basel MDPI AG 01.10.2022
• Subjects: air temperature; China; Cities; Climate change; Economic conditions; Environmental aspects; Environmental impact; Extreme heat; GDP; Global warming; Gross Domestic Product; Heat; Heat waves; High rise buildings; local climate change; Population density; Remote sensing; Rural areas; socioeconomic indicators; Sustainable urban development; Temperature; Trends; Urban areas; Urban climatology; Urban development; urban heat island; Urban heat islands; Urban planning; Urban sprawl; Urbanization; China
• ISSN: 2073-445X; 2073-445X
• DOI: 10.3390/land11101838

Extreme heat wave weather phenomena have erupted worldwide in recent years. The urban heat island (UHI) effect has exacerbated urban heat waves with serious consequences for urban energy and residents’ health. Therefore, a better understanding of the dynamics of the UHI effect and the influencing factors is needed in the context of carbon neutrality and global warming. This study used long-term observation and statistical data to investigate the urban heat island intensity (UHII) over the past 39 years (1981–2019) and to analyze the temporal changes of the UHI effect and the relationship between the UHI effect and indicators of rapid urbanization in Zhengzhou, China. The results showed that Zhengzhou is warming 2.2-times faster than the global land warming trend of about +0.9 °C from 1981 to 2019. There is a clear phase characteristic of the heat island effect in Zhengzhou, and it offers a rapid upward trend after 2000 and a positive correlation with the urbanization process; it was found that the social and economic conditions of urban expansion in Zhengzhou have a significant relationship with UHII. We also found that the denser the urban built-up area, the more obvious the heat island effect. Compared with other countries, the influence of national policies on urban development is an indirect factor influencing the change of UHI specifically for Chinese cities. This research could provide a reference for understanding the temporal dynamics of UHI in an expanding large city for sustainable urban planning and mitigating urban warming and environmental problems.