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- GC41I-0762: Comparative Cooling Effects of High-Reflectivity Surfaces and Vegetation in Arid Urban Areas
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Board 0762‚ Hall EFG (Poster Hall)NOLA CC
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Janak Parajuli, The University of Alabama in Huntsville (First Author, Presenting Author)
Leiqiu Hu, University of Alabama in Huntsville
This study examines how various passive cooling strategies influence summer air temperature (ta) in Las Vegas. By utilizing high-resolution satellite images and crowd-sourced temperature measurements, we applied statistical analysis methods to test following urban surface features across spatial scales of 20–300 m: (i) tree and turf coverage, (ii) roof reflectance, and (iii) ground‑surface reflectance. Tree canopy proved to be the most reliable coolant, reducing daily summer temperatures by up to -0.41 °C per 10 % increase in coverage at 40–150 m scales with tall trees cooling the most at midday, and shorter trees at midnight. Roof albedo on tall buildings had little direct impact near ground level, however, building shades cooled days by ‑0.35 °C m⁻¹ and warmed nights by +0.20 °C m⁻¹ within 20 m. High‑reflectance pavements minimized neighborhood‑scale (beyond 150m) temperatures by up to 0.32 °C per 10 % reflectance. Overall, the cooling benefits depended on time of day and spatial scales, suggesting that combining canopy expansion with large-scale application of cool pavements offer the best heat‑mitigation potential for arid urban cities.
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