Contrasting Trends and Drivers of Global Surface and Canopy Urban Heat Islands
Journal Article
·
· Geophysical Research Letters
- Nanjing Univ. (China)
- Nanjing Univ. (China); Jiangsu Center for Collaborative Innovation in Geographical Information Resource Development and Application, Nanjing (China)
- Univ. of Western Ontario, London, ON (Canada)
- Ruhr Univ., Bochum (Germany)
- Pacific Northwest National Laboratory (PNNL), Richland, WA (United States)
- Univ. of Alabama, Huntsville, AL (United States)
- Arizona State Univ., Tempe, AZ (United States)
- Center for Environment, Energy, and Economy, Harrisburg PA (United States)
- Sun Yat-Sen Univ., Guangzhou (China)
A comprehensive comparison of the trends and drivers of global surface and canopy urban heat islands (termed /s and /c trends, respectively) is critical for better designing urban heat mitigation strategies. However, such a global comparison remains largely absent. Using spatially continuous land surface temperatures and surface air temperatures (2003–2020), here we find that the magnitude of the global mean /s trend (0.19 ± 0.006°C/decade, mean ± SE) for 5,643 cities worldwide is nearly six-times the corresponding /c trend (0.03 ± 0.002°C/decade) during the day, while the former (0.06 ± 0.004°C/decade) is double the latter (0.03 ± 0.002°C/decade) at night. Variable importance scores indicate that global daytime /s trend is slightly more controlled by surface property, while background climate plays a more dominant role in regulating global daytime /c trend. At night, both global /s and /c trends are mainly controlled by background climate.
- Research Organization:
- Pacific Northwest National Laboratory (PNNL), Richland, WA (United States)
- Sponsoring Organization:
- National Natural Science Foundation of China (NSFC); USDOE Office of Science (SC), Biological and Environmental Research (BER). Earth & Environmental Systems Science (EESS)
- Grant/Contract Number:
- AC05-76RL01830
- OSTI ID:
- 2202432
- Report Number(s):
- PNNL-SA--189618
- Journal Information:
- Geophysical Research Letters, Journal Name: Geophysical Research Letters Journal Issue: 15 Vol. 50; ISSN 0094-8276
- Publisher:
- American Geophysical Union (AGU)Copyright Statement
- Country of Publication:
- United States
- Language:
- English
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