Department of Civil and Environmental Engineering, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, United States.
Materials Research Laboratory, Massachusetts Institute of Technology, Building E19-695, Cambridge, Massachusetts 02139, United States.
Environ Sci Technol. 2021 Sep 7;55(17):11501-11510. doi: 10.1021/acs.est.1c00664. Epub 2021 Aug 9.
We implemented a context-sensitive and prospective framework to assess the global warming potential (GWP) impacts of cool pavement strategies on specific roads for different cities. The approach incorporates several interconnections among different elements of the built environment, such as buildings and urban road segments, as well as the transportation fleet, using specific building and pavement information from an urban area. We show that increasing pavement albedo lowers urban air temperatures but can adversely affect the building energy demand in the areas with high incident radiation exposure. The heating energy savings and the radiative forcing effect improve the GWP savings in cold and humid climate conditions. The total GWP savings intensity is sensitive to the city morphology and road traffic. The probabilistic results show that cool pavement strategies can offset 1.0-3.0% and 0.7-6.0% of the total GHG emissions of the U.S. cities Boston and Phoenix, respectively, for a 50-year analysis period. The worldwide range of savings can be as large as 5.0-44.7 Gt of CO eq. A paradigm shift in pavement strategy selection is required in most neighborhoods.
我们实施了一个上下文敏感和前瞻性的框架，以评估冷却路面策略对不同城市特定道路的全球变暖潜力（GWP）影响。该方法结合了建筑环境中不同元素之间的几个相互关系，例如建筑物和城市道路段，以及使用城市区域的特定建筑和路面信息的交通车队。我们表明，增加路面反照率会降低城市空气温度，但会对辐射暴露高的区域的建筑能源需求产生不利影响。在寒冷和潮湿的气候条件下，供暖能源节约和辐射强迫效应会提高 GWP 节约。总 GWP 节约强度对城市形态和道路交通敏感。概率结果表明，冷却路面策略可以抵消美国城市波士顿和凤凰城的总温室气体排放量的 1.0-3.0%和 0.7-6.0%，分析期为 50 年。全球节约范围可达 5.0-44.7GtCO eq. 在大多数社区需要转变路面策略选择的范式。
