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Contrasting Trends and Drivers of Global Surface and Canopy Urban Heat Islands

Journal Article · · Geophysical Research Letters
DOI:https://doi.org/10.1029/2023gl104661· OSTI ID:2202432
 [1];  [2];  [3];  [4];  [5];  [1];  [6];  [7];  [1];  [8];  [9];  [9];  [1];  [1];  [1];  [1]
  1. Nanjing Univ. (China)
  2. Nanjing Univ. (China); Jiangsu Center for Collaborative Innovation in Geographical Information Resource Development and Application, Nanjing (China)
  3. Univ. of Western Ontario, London, ON (Canada)
  4. Ruhr Univ., Bochum (Germany)
  5. Pacific Northwest National Laboratory (PNNL), Richland, WA (United States)
  6. Univ. of Alabama, Huntsville, AL (United States)
  7. Arizona State Univ., Tempe, AZ (United States)
  8. Center for Environment, Energy, and Economy, Harrisburg PA (United States)
  9. 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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