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

Huilin Du; Wenfeng Zhan; James Voogt; Benjamin Bechtel; T. C. Chakraborty; Zihan Liu; Leiqiu Hu; Zhihua Wang; Jiufeng Li; Peng Fu; Weilin Liao; Ming Luo; Long Li; Shasha Wang; Fan Huang; Shiqi Miao

doi:10.1029/2023GL104661

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

Huilin Du, Wenfeng Zhan, James Voogt, Benjamin Bechtel, T. C. Chakraborty, Zihan Liu, Leiqiu Hu, Zhihua Wang, Jiufeng Li, Peng Fu, Weilin Liao, Ming Luo, Long Li, Shasha Wang, Fan Huang, Shiqi Miao

Research output: Contribution to journal › Article › peer-review

8 Scopus citations

Abstract

A comprehensive comparison of the trends and drivers of global surface and canopy urban heat islands (termed I_s and I_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 I_s trend (0.19 ± 0.006°C/decade, mean ± SE) for 5,643 cities worldwide is nearly six-times the corresponding I_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 I_s trend is slightly more controlled by surface property, while background climate plays a more dominant role in regulating global daytime I_c trend. At night, both global I_s and I_c trends are mainly controlled by background climate.

Original language	English (US)
Article number	e2023GL104661
Journal	Geophysical Research Letters
Volume	50
Issue number	15
DOIs	https://doi.org/10.1029/2023GL104661
State	Published - Aug 16 2023
Externally published	Yes

Keywords

background climate
canopy urban heat island
surface property
surface urban heat island
urban climate change

ASJC Scopus subject areas

Geophysics
General Earth and Planetary Sciences

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10.1029/2023GL104661

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title = "Contrasting Trends and Drivers of Global Surface and Canopy Urban Heat Islands",

abstract = "A comprehensive comparison of the trends and drivers of global surface and canopy urban heat islands (termed Is and Ic 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 Is trend (0.19 ± 0.006°C/decade, mean ± SE) for 5,643 cities worldwide is nearly six-times the corresponding Ic 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 Is trend is slightly more controlled by surface property, while background climate plays a more dominant role in regulating global daytime Ic trend. At night, both global Is and Ic trends are mainly controlled by background climate.",

keywords = "background climate, canopy urban heat island, surface property, surface urban heat island, urban climate change",

author = "Huilin Du and Wenfeng Zhan and James Voogt and Benjamin Bechtel and Chakraborty, {T. C.} and Zihan Liu and Leiqiu Hu and Zhihua Wang and Jiufeng Li and Peng Fu and Weilin Liao and Ming Luo and Long Li and Shasha Wang and Fan Huang and Shiqi Miao",

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year = "2023",

month = aug,

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doi = "10.1029/2023GL104661",

language = "English (US)",

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T1 - Contrasting Trends and Drivers of Global Surface and Canopy Urban Heat Islands

AU - Du, Huilin

AU - Zhan, Wenfeng

AU - Voogt, James

AU - Bechtel, Benjamin

AU - Chakraborty, T. C.

AU - Liu, Zihan

AU - Hu, Leiqiu

AU - Wang, Zhihua

AU - Li, Jiufeng

AU - Fu, Peng

AU - Liao, Weilin

AU - Luo, Ming

AU - Li, Long

AU - Wang, Shasha

AU - Huang, Fan

AU - Miao, Shiqi

PY - 2023/8/16

Y1 - 2023/8/16

N2 - A comprehensive comparison of the trends and drivers of global surface and canopy urban heat islands (termed Is and Ic 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 Is trend (0.19 ± 0.006°C/decade, mean ± SE) for 5,643 cities worldwide is nearly six-times the corresponding Ic 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 Is trend is slightly more controlled by surface property, while background climate plays a more dominant role in regulating global daytime Ic trend. At night, both global Is and Ic trends are mainly controlled by background climate.

AB - A comprehensive comparison of the trends and drivers of global surface and canopy urban heat islands (termed Is and Ic 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 Is trend (0.19 ± 0.006°C/decade, mean ± SE) for 5,643 cities worldwide is nearly six-times the corresponding Ic 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 Is trend is slightly more controlled by surface property, while background climate plays a more dominant role in regulating global daytime Ic trend. At night, both global Is and Ic trends are mainly controlled by background climate.

KW - background climate

KW - canopy urban heat island

KW - surface property

KW - surface urban heat island

KW - urban climate change

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

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Keywords

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