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Do green roofs cool the air?

机译：绿色屋顶能冷却空气吗？

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Rapid urbanization and an increasing number and duration of heat waves poses a need to mitigate extremely, high temperatures. One of the repeatedly suggested measures to moderate the so called urban heat island are green roofs. This study investigates several extensive sedum-covered green roofs in Utrecht (NL) and their effect on air temperature right above the roof surface. The air temperature was measured 15 and 30 cm above the roof surface and also in the substrate. We showed that under well watered conditions, the air above the green roof, compared to the white gravel roof, was colder at night and warmer during the day. This suggests that extensive sedum-covered green roofs might help decrease air temperatures at night, when the urban heat island is strongest, but possibly contribute to high daytime temperatures. The average 24 h effect of sedum-covered green roof was a 0.2 degrees C increase of air temperature 15 cm above the ground. During a dry year the examined green roof exhibited behavior similar to conventional white gravel roof even exhibited slight cooling effect in late afternoon. Interestingly, the pattern of soil temperature remained almost the same for both dry and well-prospering green roofs, colder during the day and warmer at night. (C) 2016 Elsevier Ltd. All rights reserved.
机译：快速的城市化以及热浪的数量和持续时间的增加，都需要缓解极端高温。多次建议的缓和所谓的城市热岛的措施之一是绿色屋顶。这项研究调查了乌特勒支（NL）的数个覆盖有景天的大面积绿色屋顶及其对屋顶表面上方气温的影响。测得的空气温度高于屋顶表面15厘米和30厘米，也位于基材中。我们发现，在充足的灌溉条件下，与白色的砾石屋顶相比，绿色屋顶上方的空气在晚上更冷，白天更温暖。这表明，覆盖有大量景天的绿色屋顶可能有助于降低夜间的气温，这是城市热岛最强的夜晚，但可能会导致白天的高温。覆盖有景天的绿色屋顶的平均24小时效果是，空气温度比地面高15 cm，升高了0.2摄氏度。在干燥的一年中，检查过的绿色屋顶表现出与常规白色砾石屋顶相似的行为，甚至在午后表现出轻微的降温效果。有趣的是，干燥和繁荣的绿色屋顶的土壤温度模式几乎保持不变，白天更冷，晚上更热。 （C）2016 Elsevier Ltd.保留所有权利。

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