气候变化领域集成服务门户(CCPortal): Efficacy of cool roofs at reducing pedestrian-level air temperature during projected 21st century heatwaves in Atlanta, Detroit, and Phoenix (USA)

CCPortal

DOI	10.1088/1748-9326/ab6a23
	Efficacy of cool roofs at reducing pedestrian-level air temperature during projected 21st century heatwaves in Atlanta, Detroit, and Phoenix (USA)
	Broadbent A.M.; Krayenhoff E.S.; Georgescu M.
发表日期	2020
ISSN	17489318
卷号	15 期号:8
英文摘要	The air temperature cooling impacts of infrastructure-based adaptation measures in expanding urban areas and under changing climatic conditions are not well understood. We present simulations conducted with the Weather Research and Forecasting (WRF) model, coupled to a multi-layer urban model that explicitly resolves pedestrian-level conditions. Our simulations dynamically downscale global climate projections, account for projected urban growth, and examine cooling impacts of extensive cool roof deployment in Atlanta, Detroit, and Phoenix (USA). The simulations focus on heatwave events that are representative of start-, middle-, and end-of-century climatic conditions. Extensive cool roof implementation is projected to cause a maximum city-averaged daytime air temperature cooling of 0.38 C in Atlanta; 0.42 C in Detroit; and 0.66 C in Phoenix. We propose a means for practitioners to estimate the impact of cool roof treatments on pedestrian-level air temperature, for a chosen roof reflectivity, with a new metric called the Albedo Cooling Effectiveness (ACE). The ACE metric reveals that, on average, cool roofs in Phoenix are 11% more effective at lowering pedestrian-level air temperature than in Atlanta, and 30% more effective than in Detroit. Cool roofs remain similarly effective under future heatwaves relative to contemporary heatwaves for Atlanta and Detroit, with some indication of increased effectiveness under future heatwaves for Phoenix. By highlighting the underlying factors that drive cooling effectiveness in a trio of cities located in different climatic regions, we demonstrate a robust framework for estimating the pedestrian-level cooling impacts associated with reflective roofs without the need for computationally demanding simulations. © 2020 The Author(s). Published by IOP Publishing Ltd.
英文关键词	climate change; cool roofs; cooling effectiveness; heat mitigation; urban climate; urban expansion; WRF
语种	英语
scopus关键词	Roofs; Urban growth; Weather forecasting; Air temperature; Climatic conditions; Climatic regions; Cooling effectiveness; Global climate projections; Underlying factors; Urban areas; Weather research and forecasting models; Atmospheric temperature; air temperature; climate conditions; cooling; global climate; heat wave; pedestrian; roof; urban growth; Arizona; Atlanta; Detroit; Georgia; Michigan; Phoenix; United States; Atlanta; Phoenix
来源期刊	Environmental Research Letters
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/153890
作者单位	School of Geographical Sciences and Urban Planning, Arizona State University, Tempe, AZ, United States; Urban Climate Research Centre, Arizona State University, United States; School of Environmental Sciences, University of Guelph, Guelph, ON, Canada; Global Institute of Sustainability, Arizona State University, United States
推荐引用方式 GB/T 7714	Broadbent A.M.,Krayenhoff E.S.,Georgescu M.. Efficacy of cool roofs at reducing pedestrian-level air temperature during projected 21st century heatwaves in Atlanta, Detroit, and Phoenix (USA)[J],2020,15(8).
APA	Broadbent A.M.,Krayenhoff E.S.,&Georgescu M..(2020).Efficacy of cool roofs at reducing pedestrian-level air temperature during projected 21st century heatwaves in Atlanta, Detroit, and Phoenix (USA).Environmental Research Letters,15(8).
MLA	Broadbent A.M.,et al."Efficacy of cool roofs at reducing pedestrian-level air temperature during projected 21st century heatwaves in Atlanta, Detroit, and Phoenix (USA)".Environmental Research Letters 15.8(2020).