首页|Greater local cooling effects of trees across globally distributed urban green spaces
Greater local cooling effects of trees across globally distributed urban green spaces
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NETL
NSTL
Elsevier
Urban green spaces (UGS) are an effective mitigation strategy for urban heat islands (UHIs) through theirevapotranspiration and shading effects. Yet, the extent to which local UGS cooling effects vary across differentbackground climates, plant characteristics and urban settings across global cities is not well understood. Thisstudy analysed 265 local air temperature (T_A) measurements from 58 published studies across globallydistributed sites to infer the potential influence of background climate, plant and urban variables among differentUGS types (trees, grass, green roofs and walls). We show that trees were more effective at reducing local T_A, withreductions 2–3 times greater than grass and green roofs and walls. We use a hierarchical linear mixed effectsmodel to reveal that background climate (mean annual temperature) and plant characteristics (specific leaf areavegetation index) had the greatest influence on cooling effects across UGS types, while urban characteristics didnot significantly influence the cooling effects of UGS. Notably, trees dominated the overall local cooling effectsacross global cities, indicating that greater tree growth in mild climates with lower mean annual temperatureshas the greatest mitigation potential against UHIs. Our findings provide insights for urban heat mitigation usingUGS interventions, particularly trees across cities worldwide with diverse climatic and environmental conditionsand highlight the essential role of trees in creating healthy urban living environments for citizens under extremeweather conditions.
Urban heatGreen infrastructureBackground climateHeat mitigationVegetation index
NETL
NSTL
Elsevier
