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Global urban greening and its implication for urban heat mitigation
Guangdong Li1,2, Yue Cao1,2, Chuanglin Fang1,2
1Key Laboratory of Regional Sustainable Development Modeling, Institute of Geographic Sciences and Natural Resources Research, Chinese Academy of Sciences, Beijing 100101, China.
Summary
Urban vegetation is changing globally, with nearly equal greening and browning trends. Greening areas offer significant cooling benefits, crucial for mitigating urban heat island effects and promoting sustainable development.
Area of Science:
- Environmental Science
- Urban Ecology
- Remote Sensing
Background:
- Urban vegetation offers vital ecosystem services for biodiversity and human well-being.
- Global trends, drivers, and heat mitigation impacts of urban vegetation dynamics are not well understood.
Purpose of the Study:
- To analyze global urban vegetation dynamics using high-resolution data.
- To identify drivers of vegetation change and quantify heat mitigation benefits.
Main Methods:
- Utilized a high-resolution enhanced vegetation index (EVI) dataset for 11,235 global urban areas.
- Analyzed vegetation trends (greening/browning) and correlated them with urbanization and nitrogen deposition.
- Estimated cooling effects of vegetation changes on urban heat.
Main Results:
- 40.75% of urban areas showed greening trends, while 49.60% showed browning.
- Significant spatial disparities exist, with higher greening ratios in the Global North.
- Urban centers experienced greening driven by nitrogen deposition and urbanization, while peripheries showed browning.
Conclusions:
- Urban vegetation greening is crucial for mitigating urban heat island effects, especially in summer.
- Targeted strategies to enhance urban greening are essential for equitable urban development and climate change adaptation.
- Understanding drivers like urbanization and nitrogen deposition is key to managing urban vegetation effectively.
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