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首页> 外文期刊>Environmental Science & Technology >Investigating the Urban Air Quality Effects of Cool Walls and Cool Roofs in Southern California
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Investigating the Urban Air Quality Effects of Cool Walls and Cool Roofs in Southern California

机译：调查南加州凉爽的墙壁和凉爽的屋顶对城市空气质量的影响

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摘要

Solar reflective cool roofs and walls can be used to mitigate the urban heat island effect. While many past studies have investigated the climate impacts of adopting cool surfaces, few studies have investigated their effects on air pollution, especially on particulate matter (PM). This research for the first time investigates the influence of widespread deployment of cool walls on urban air pollutant concentrations, and systematically compares cool wall to cool roof effects. Simulations using a coupled meteorology-chemistry model (WRF-Chem) for a representative summertime period show that cool walls and roofs can reduce urban air temperatures, wind speeds, and planetary boundary heights in the Los Angeles Basin. Consequently, increasing wall (roof) albedo by 0.80, an upper bound scenario, leads to maximum daily 8-h average ozone concentration reductions of 0.35 (0.83) ppbv in Los Angeles County. However, cool walls (roofs) increase daily average PM2.5 concentrations by 0.62 (0.85) mu g( )m(-3). We investigate the competing processes driving changes in concentrations of speciated PM2.5. Increases in primary PM (elemental carbon and primary organic aerosols) concentrations can be attributed to reductions in ventilation of the Los Angeles Basin. Increases in concentrations of semivolatile species (e.g., nitrate) are mainly driven by increases in gas-to-particle conversion due to reduced atmospheric temperatures.
机译：可以使用太阳能反射的凉爽屋顶和墙壁来减轻城市的热岛效应。尽管过去的许多研究调查了采用凉爽表面对气候的影响，但很少有研究调查其对空气污染的影响，尤其是对颗粒物（PM）的影响。这项研究首次调查了冷墙的广泛部署对城市空气污染物浓度的影响，并系统地比较了冷墙和冷屋顶的影响。使用代表性的夏季，结合气象化学模型（WRF-Chem）进行的模拟显示，凉爽的墙壁和屋顶可以降低洛杉矶盆地的城市气温，风速和行星边界高度。因此，将壁（屋顶）反照率提高0.80（上限）会导致洛杉矶县每天平均8小时最大臭氧浓度降低0.35（0.83）ppbv。但是，凉爽的墙壁（屋顶）会使每日平均PM2.5浓度增加0.62（0.85）μg（）m（-3）。我们调查了竞争性过程，推动了特定PM2.5浓度的变化。初级PM（元素碳和初级有机气溶胶）浓度的增加可归因于洛杉矶盆地通风的减少。半挥发性物质（例如硝酸盐）的浓度增加主要是由于大气温度降低导致气体到颗粒的转化增加。

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  • 来源
    《Environmental Science & Technology》 |2019年第13期|7532-7542|共11页
  • 作者

    Zhang Jiachen; Li Yun; Tao Wei; Liu Junfeng; Levinson Ronnen; Mohegh Arash; Ban-Weiss George;

  • 作者单位

    Univ Southern Calif, Dept Civil & Environm Engn, Los Angeles, CA 90089 USA;

    Univ Southern Calif, Dept Civil & Environm Engn, Los Angeles, CA 90089 USA;

    Max Planck Inst Chem, Multiphase Chem Dept, Hahn Meitner Weg 1, D-55128 Mainz, Germany;

    Peking Univ, Coll Urban & Environm Sci, Lab Earth Surface Proc, Beijing 100871, Peoples R China;

    Lawrence Berkeley Natl Lab, Heat Isl Grp, Berkeley, CA 94720 USA;

    Univ Southern Calif, Dept Civil & Environm Engn, Los Angeles, CA 90089 USA;

    Univ Southern Calif, Dept Civil & Environm Engn, Los Angeles, CA 90089 USA;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);美国《化学文摘》(CA);
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