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Related Experiment Video

Updated: May 14, 2025

A Venturi Effect Can Help Cure Our Trees
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Enhancing Climate-Driven Urban Tree Cooling with Targeted Nonclimatic Interventions.

Zhaowu Yu1,2, Siheng Li1, Wenjun Yang1

  • 1Department of Environmental Science and Engineering, Fudan University, Shanghai 200438, China.

Environmental Science & Technology
|May 2, 2025
PubMed
Summary

Urban trees significantly reduce surface temperatures, with a 10% increase in tree cover lowering temperatures by 0.25°C during the day. Cooling efficiency varies by climate, highlighting the need for targeted urban greening strategies.

Keywords:
XGBoost modelcooling efficiencyglobal patternsnonclimatic factorsurban trees

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Area of Science:

  • Urban ecology
  • Environmental science
  • Climate change adaptation

Background:

  • Urban trees are crucial for mitigating heat island effects.
  • Global patterns and drivers of urban tree cooling efficiency are not well understood.

Purpose of the Study:

  • To quantify the cooling efficiency (CE) of urban trees across diverse climatic zones.
  • To identify key climatic and nonclimatic determinants influencing urban tree CE.
  • To provide data-driven insights for optimizing urban greening strategies.

Main Methods:

  • Quantified diel (24-hour) cooling efficiency for 229 cities globally.
  • Utilized a machine-learning model to assess variable influences on CE.
  • Analyzed relationships between tree cover, impervious surfaces, and temperature reduction.

Main Results:

  • A 10% increase in tree cover reduced surface temperatures by 0.25°C (day) and 0.04°C (night).
  • Humid regions showed highest daytime CE; arid regions showed highest nighttime CE, linked to canopy density.
  • Optimal impervious surface coverage varied by climate (e.g., ~60% in arid, ~40% in humid regions).

Conclusions:

  • Climatic factors significantly influence urban tree cooling, but nonclimatic factors can be managed for optimization.
  • Nonlinear effects of variables necessitate targeted management thresholds for maximizing cooling benefits.
  • Findings offer practical guidance for designing climate-resilient, nature-based urban strategies.