气候变化领域集成服务门户(CCPortal): Downwind footprint of an urban heat island on air and lake temperatures

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DOI	10.1038/s41612-018-0055-3
	Downwind footprint of an urban heat island on air and lake temperatures
	Cosgrove A.; Berkelhammer M.
发表日期	2018
ISSN	23973722
卷号	1 期号:1
英文摘要	The urban heat island (UHI) effect was first documented ~200 years ago, making it the longest recognized anthropogenic effect on climate. Although anomalous heating in cities has been meticulously characterized, less is known about how the UHI affects surrounding regions. It is hypothesized that downwind of cities a “heat plume” forms due to the advection of urban heat. This heat transport may have impacts beyond heating of the surface, such as disrupting atmospheric convection and influencing boundary layer structure, which influences weather, air quality, and human health. Here, a lagrangian atmospheric transport model, forced with archived data from a numerical weather model, is used to generate a three-dimensional map of an urban heat plume for a major city, Chicago. We document significant heating 100–200 m above the surface and 70 km downwind of the city. Over Lake Michigan, the scale of the plume is truncated nearly in half (~40 km), suggesting the lake is acting as a sink for the exported urban heat. Using satellite lake surface temperatures, we observed a disruption of the diurnal pattern of lake temperature beneath the plume, which supports a possible role of the lake in absorbing the heat plume. The results provide unique quasi-observational evidence for a significant footprint of cities on regional atmospheric structure and potentially on adjacent aquatic bodies. © 2018, The Author(s).
语种	英语
scopus关键词	air quality; air temperature; atmospheric plume; atmospheric transport; boundary layer; heat island; lake water; urban climate; water temperature; Chicago; Great Lakes [North America]; Illinois; Lake Michigan; United States
来源期刊	npj Climate and Atmospheric Science
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/178151
作者单位	Department of Earth and Environmental Sciences, University of Illinois at Chicago, Chicago, United States
推荐引用方式 GB/T 7714	Cosgrove A.,Berkelhammer M.. Downwind footprint of an urban heat island on air and lake temperatures[J],2018,1(1).
APA	Cosgrove A.,&Berkelhammer M..(2018).Downwind footprint of an urban heat island on air and lake temperatures.npj Climate and Atmospheric Science,1(1).
MLA	Cosgrove A.,et al."Downwind footprint of an urban heat island on air and lake temperatures".npj Climate and Atmospheric Science 1.1(2018).