地理漫步·世界地理英语30篇（6）

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城市热群岛与夜间降温廊道

Cities form thermal archipelagos—hot islands surrounded by cooler rural seas—visible in nighttime satellite thermal imagery.
Within cities, parks and river corridors act as cooling corridors where temperatures drop 4–6°C after sunset.
Building height and street orientation determine whether canyon effects trap heat or channel nocturnal breezes.
Thermal inertia differences between asphalt (slow-cooling) and irrigated lawns (rapid-cooling) drive local air circulation.
LiDAR-based 3D city models predict cooling corridor effectiveness better than 2D land-cover maps alone.
Areas with high tree canopy cover and permeable surfaces sustain longer dew-point durations, enhancing evaporative cooling.
Nighttime radiative cooling is strongest where sky view factors exceed 0.7, unblocked by tall buildings.
Urban planners now designate 'cooling priority zones' where green infrastructure yields maximum thermal relief.
These corridors also guide bat and moth movements, linking fragmented ecological functions across built landscapes.
Mapping thermal archipelagos reveals inequality: low-income districts often lack cooling corridors entirely.