The phenomenon of urban heat islands (UHIs) has garnered significant attention in recent decades due to its implications for public health and energy consumption. UHIs occur when metropolitan areas experience higher temperatures than surrounding rural regions, primarily because of the prevalence of concrete and asphalt, which absorb and re-emit solar radiation more effectively than natural landscapes. Additionally, anthropogenic heat from vehicles and air conditioning systems exacerbates the effect. Mitigation strategies, such as increasing vegetative cover and implementing reflective roofing materials, have been proposed; however, their efficacy varies with local climate and urban morphology. Recent studies suggest that a combination of green infrastructure and policy interventions, including building codes that mandate cool roofs, may yield the most substantial reductions in peak summer temperatures, thereby alleviating heat-related mortality and reducing cooling demands.
❓ 根据文章所述,城市热岛效应的主要原因是什么?
A. A) 城市地区空调系统使用增加
B. B) 城市建设材料对太阳辐射的吸收与再发射
C. C) 农村地区植被缺乏
D. D) 城市人口密度高于农村地区
✅ 正确答案
B) The absorption and re-emission of solar radiation by urban construction materials