The frequency and intensity of heat waves (HW) in cities are on the rise due to climate change as well as urban fabric materials and anthropogenic activities that affect heat accumulation. The efficacy of HW mitigation strategies depends on a city's specific and unique morphology, land use, building materials, climate and geography. In this study, we show the effectiveness of cool roofs and vegetation in reducing temperature in the Metropolitan Area of Barcelona (AMB). We use the Weather and Research Forecasting (WRF) model with the urban scheme BEP+BEM, including11 urban classes to simulate a HW that occurred in August 2015. We find that cool roofs reduce temperature best during the day (0.67 °C average and 2.22 °C maximum reductions), while additional green areas moderate temperatures to a lesser degree but also more evenly during the day and at night (average reductions of 0.15 °C and 0.17 °C, respectively). However, when irrigation is increased, the temperature reduction during the day is intensified due to the cooling effect of more evapotranspiration. The thermal regulation of combining the two strategies is the most evenly distributed over the AMB and has the highest impact, with an average and maximum reduction of 1.26 °C and 4.73 °C at 13:00UTC.

由于气候变化以及影响热积累的城市结构材料和人为活动，城市中的热波（HW）的频率和强度正在上升。硬件减轻策略的效果取决于城市的特定和独特形态，土地使用，建筑材料，气候和地理。在这项研究中，我们展示了凉爽的屋顶和植被在降低巴塞罗那市区（AMB）的温度方面的有效性。我们将天气和研究预测（WRF）模型与BEP + BEM城市计划结合使用，包括11个城市类别，以模拟2015年8月发生的硬件。我们发现凉爽的屋顶在一天中的温度下降最好（平均温度为0.67°C，温度为2.22 °C最大减少量），而其他绿色区域则使温度降低的程度较小，但在白天和晚上却较为均匀（平均降低幅度分别为0.15°C和0.17°C）。但是，增加灌溉量时，由于蒸散量更大的冷却作用，白天的降温加剧。结合这两种策略的热调节在AMB上分布最均匀，影响最大，在13：00UTC时平均和最大降低了1.26°C和4.73°C。