气候变化领域集成服务门户(CCPortal): Seasonal hysteresis of surface urban heat islands

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DOI	10.1073/pnas.1917554117
	Seasonal hysteresis of surface urban heat islands
	Manoli G.; Fatichi S.; Bou-Zeid E.; Katul G.G.
发表日期	2020
ISSN	0027-8424
起始页码	7082
结束页码	7089
卷号	117 期号:13
英文摘要	Temporal dynamics of urban warming have been extensively studied at the diurnal scale, but the impact of background climate on the observed seasonality of surface urban heat islands (SUHIs) remains largely unexplored. On seasonal time scales, the intensity of urban-rural surface temperature differences (ΔTs) exhibits distinctive hysteretic cycles whose shape and looping direction vary across climatic zones. These observations highlight possible delays underlying the dynamics of the coupled urban-biosphere system. However, a general argument explaining the observed hysteretic patterns remains elusive. A coarsegrained model of SUHI coupled with a stochastic soil water balance is developed to demonstrate that the time lags between radiation forcing, air temperature, and rainfall generate a ratedependent hysteresis, explaining the observed seasonal variations of ΔTs. If solar radiation is in phase with water availability, summer conditions cause strong SUHI intensities due to high rural evaporative cooling. Conversely, cities in seasonally dry regions where evapotranspiration is out of phase with radiation show a summertime oasis effect controlled by background climate and vegetation properties. These seasonal patterns of warming and cooling have significant implications for heat mitigation strategies as urban green spaces can reduce ΔTs during summertime, while potentially negative effects of albedo management during winter are mitigated by the seasonality of solar radiation. © 2020 National Academy of Sciences. All rights reserved.
英文关键词	Cities; Hysteresis; Seasonality; Surface temperature; Urban heat island
语种	英语
scopus关键词	rain; soil water; air pollution; air temperature; Article; biosphere; climate change; controlled study; energy conservation; environmental aspects and related phenomena; evaporation; evapotranspiration; geographic and geological phenomena; greenhouse effect; hysteresis; island (geological); microclimate; precipitation; priority journal; radiation and radiation related phenomena; rural area; seasonal variation; solar radiation; statistical model; summer; surface urban heat island; temporal analysis; thermal pollution; urban area; vegetation; water availability; winter
来源期刊	Proceedings of the National Academy of Sciences of the United States of America
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/161007
作者单位	Manoli, G., Department of Civil, Environmental and Geomatic Engineering, University College London, London, WC1E 6BT, United Kingdom; Fatichi, S., Institute of Environmental Engineering, Eidgenossische Technische Hochschule Zurich, Zurich, 8093, Switzerland, Department of Civil and Environmental Engineering, National University of Singapore, Singapore, 117576, Singapore; Bou-Zeid, E., Department of Civil and Environmental Engineering, Princeton University, Princeton, NJ 08544, United States; Katul, G.G., Nicholas School of the Environment, Duke University, Durham, NC 27708, United States
推荐引用方式 GB/T 7714	Manoli G.,Fatichi S.,Bou-Zeid E.,et al. Seasonal hysteresis of surface urban heat islands[J],2020,117(13).
APA	Manoli G.,Fatichi S.,Bou-Zeid E.,&Katul G.G..(2020).Seasonal hysteresis of surface urban heat islands.Proceedings of the National Academy of Sciences of the United States of America,117(13).
MLA	Manoli G.,et al."Seasonal hysteresis of surface urban heat islands".Proceedings of the National Academy of Sciences of the United States of America 117.13(2020).