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The seasonal microclimate trends of a large scale extensive green roof

机译：大规模广泛绿色屋顶的季节性微气密趋势

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摘要

At nearly 27,500 m2, the Jacob K. Javits Convention Center (JJCC) located in New York City, hosts one of the largest extensive green roofs in the United States. This paper explores three years of fine scale microclimate data collected at the JJCC green roof and its potential ability to reduce the urban heat island intensity (UHII). Surface energy fluxes and microclimate parameters on four different surfaces are analyzed before and after installation of the southern section of the green roof, offering a unique before/after, test/control study. The results indicate that the temperatures of the air above the green roof, and its exterior surface are different (e.g. lower) than those measured above and on, respectively, the black roof that preceded it. Differences in the maximum daytime air and surface temperature between the black and green roof were 1.80 degrees C and 18.4 degrees C, respectively. Installation of the green roof increased evapotranspiration, modifying the roof's surface energy balance, and reduced the median summer nighttime UHII (compared to the pedestrian level station) by 0.91 degrees C. Though microclimatic conditions on two sections of the green roofs vary somewhat, the research findings generally support the statement that green roofs are a moderately effective strategy for mitigating the UHI effect.
机译：距离纽约市的Jacob K. javits会议中心（JJCC）近27,500平方米，位于美国最大的广泛绿色屋顶之一。本文探讨了JJCC绿色屋顶收集的三年精细规模的微气候数据及其降低城市热岛强度（UHII）的潜力能力。在绿色屋顶南部的安装前后分析了四个不同表面上的表面能量通量和微气候参数，提供了独特的测试/对照研究。结果表明绿色屋顶上方的空气的温度，其外表面积不同（例如，下方）分别是上述黑色屋顶的那些。黑色和绿色屋顶之间最大白天空气和表面温度的差异分别为1.80℃和18.4摄氏度。屋顶绿化的安装增加蒸散，修改所述屋顶的表面能量平衡，并通过0.91摄氏度虽然小气候条件对绿色屋顶的两个部分减少位数夏季夜间UHII（相对于行人一级站）而略有改变，研究调查结果通常支持绿色屋顶是一种适度有效的减轻UHI效应的策略。

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