中文摘要：

为评价“白屋顶计划”对缓解城市热岛将就的有效性，以上海市城区为例进行了研究。首先，对研究区域TM图像进行大气校正获取地表反照率：然后，用Hottel模型模拟了晴天逐时太阳辐照度，并对城市屋顶在不同反射率下吸收太阳辐射过程进行了模拟；最后，经过回归建模估算出“白屋顶计划”在夏季午间高温时段能使热岛温度降低1.32℃，并估算出夏季白屋顶室内空调节能效率可达12.60%。

英文摘要：

In order to evaluate the white roof plan for quantitative alleviation of the urban heat island effect, the authors, adopting Shanghai as a study area and based on remote sensing, obtained the data of roof reflectance. By using Hottel model, the sun sunny hourly irradiance was simulated, and the city＇ s rooftops in the absorption of solar radiation were employed to simulate the process under different values of reflectance. According to the ＂white roof plan＂, the authors estimated that the temperature of island intensity in the study area can reduce 1.32 ℃ during the lunch period in summer. In combination with the white roof heat transfer model, the authors also estimated that, in the house with white rooftop in summer, the air conditioning energy efficiency can be up to 12.60%.