Vahmani Pouya, Jones Andrew D
Lawrence Berkeley National Laboratory, One Cyclotron Road, Berkeley, CA, 94720, USA.
Nat Commun. 2017 Oct 20;8(1):1072. doi: 10.1038/s41467-017-01346-1.
Many cities globally are seeking strategies to counter the consequences of both a hotter and drier climate. While urban heat mitigation strategies have been shown to have beneficial effects on health, energy consumption, and greenhouse gas emissions, their implications for water conservation have not been widely examined. Here we use a suite of satellite-supported regional climate simulations in California to show that broad implementation of cool roofs, a heat mitigation strategy, not only results in significant cooling, but can also meaningfully decrease outdoor water consumption by reducing evaporative and irrigation water demands. Irrigation water consumption across the major metropolitan areas is reduced by up to 9% and irrigation water savings per capita range from 1.8 to 15.4 gallons per day across 18 counties examined. Total water savings are found to be the highest in Los Angeles county, reaching about 83 million gallons per day. Cool roofs are a valuable solution for addressing the adaptation and mitigation challenges faced by multiple sectors in California.
全球许多城市都在寻求应对气候变热和变干后果的策略。虽然城市热缓解策略已被证明对健康、能源消耗和温室气体排放有有益影响，但其对节水的影响尚未得到广泛研究。在此，我们利用加利福尼亚州一套由卫星支持的区域气候模拟结果表明，广泛实施凉爽屋顶这一热缓解策略，不仅能带来显著降温，还能通过减少蒸发和灌溉用水需求，切实降低室外用水量。主要都市区的灌溉用水量减少了多达9%，在所研究的18个县中，人均灌溉节水量在每天1.8至15.4加仑之间。发现洛杉矶县的总节水量最高，达到每天约8300万加仑。凉爽屋顶是应对加利福尼亚州多个部门所面临的适应和缓解挑战的宝贵解决方案。
