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Interannual variability and spatial diversification of global urban tree cooling effects
Song Leng1, Ranhao Sun2, Ming Yan2
1State Key Laboratory of Urban and Regional Ecology, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China.
Environment International
|October 12, 2024
Summary
Urban tree cooling efficiency (TCE) varies significantly year-to-year, especially in developing regions. Higher tree cover can stabilize cooling potential, crucial for climate change adaptation.
Area of Science:
- Urban Ecology
- Climate Change Adaptation
- Remote Sensing
Background:
- Urban greening is widespread, but its impact on city cooling potential is not fully understood.
- Assessing the temporal dynamics of tree cooling efficiency (TCE) is crucial for urban climate adaptation strategies.
Purpose of the Study:
- To analyze the spatial and temporal variations in tree cooling efficiency (TCE) across 550 global cities from 2002 to 2020.
- To investigate the relationship between urban tree cover and the stability of TCE.
Main Methods:
- Utilized multi-satellite observations to assess TCE dynamics.
- Analyzed data from 550 cities worldwide spanning 19 years (2002-2020).
Main Results:
- Identified substantial interannual variability in TCE, particularly in Africa, Asia, and South America.
- Cities with higher tree cover (Europe, US) showed lower TCE year-to-year fluctuations.
- Found a significant association between tree cover level and the magnitude of TCE temporal dynamics.
Conclusions:
- Urban vegetation expansion alone may not consistently enhance cooling capabilities.
- Increasing tree cover is vital for stabilizing urban cooling potential amidst climate change.
- Tree cover plays a key role in enhancing the resilience of urban cooling services.
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